{"id":21174,"date":"2022-06-11T15:43:53","date_gmt":"2022-06-11T07:43:53","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=21174"},"modified":"2022-06-11T15:51:14","modified_gmt":"2022-06-11T07:51:14","slug":"how-to-do-metallographic-preparation-and-hardness-test-of-cemented-carbide-in-meetyou-carbide","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/how-to-do-metallographic-preparation-and-hardness-test-of-cemented-carbide-in-meetyou-carbide\/","title":{"rendered":"C\u00e1ch th\u1ef1c hi\u1ec7n Chu\u1ea9n b\u1ecb kim lo\u1ea1i v\u00e0 ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng c\u1ee7a cacbua xi m\u0103ng trong Metyou CARBIDE"},"content":{"rendered":"
\n

Cacbua xi m\u0103ng l\u00e0 m\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u h\u1ee3p kim \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf b\u1eb1ng qu\u00e1 tr\u00ecnh luy\u1ec7n kim b\u1ed9t s\u1eed d\u1ee5ng c\u00e1c h\u1ee3p ch\u1ea5t c\u1ee9ng c\u1ee7a kim lo\u1ea1i ch\u1ecbu l\u1eeda nh\u01b0 cacbua vonfram (WC) ho\u1eb7c cacbit lo\u1ea1i MC kh\u00e1c v\u00e0 c\u00e1c kim lo\u1ea1i li\u00ean k\u1ebft. C\u00e1c kim lo\u1ea1i li\u00ean k\u1ebft ch\u1ee7 y\u1ebfu l\u00e0 coban, niken v\u00e0 s\u1eaft.<\/p>\n\n\n\n

Chu\u1ea9n b\u1ecb kim lo\u1ea1i h\u1ecdc<\/strong><\/strong><\/h2>\n\n\n\n

N\u00f3i chung, m\u00e1y c\u1eaft ch\u00ednh x\u00e1c c\u00f4ng su\u1ea5t cao v\u00e0 l\u01b0\u1ee1i c\u1eaft kim c\u01b0\u01a1ng (20lc) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ea5y m\u1eabu cacbua xi m\u0103ng. Do \u0111\u1eb7c t\u00ednh c\u1ee9ng ri\u00eang n\u00ean \u0111\u1ed9 ph\u1eb3ng b\u1ec1 m\u1eb7t c\u1eaft r\u1ea5t t\u1ed1t, th\u01b0\u1eddng kh\u00f4ng c\u1ea7n th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc m\u00e0i th\u00f4.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

C\u00e1c m\u1eabu \u0111\u00e3 lo\u1ea1i b\u1ecf th\u01b0\u1eddng c\u1ea7n \u0111\u01b0\u1ee3c d\u00e1t tr\u01b0\u1edbc khi m\u00e0i v\u00e0 \u0111\u00e1nh b\u00f3ng. Trong l\u1edbp ph\u1ee7, ch\u00fang t\u00f4i khuy\u00ean b\u1ea1n n\u00ean s\u1eed d\u1ee5ng nh\u1ef1a epoxy l\u1edbp ph\u1ee7 n\u00f3ng \u0111\u01b0\u1ee3c th\u00eam v\u00e0o kho\u00e1ng ch\u1ea5t ho\u1eb7c b\u1ed9t th\u1ee7y tinh. N\u1ebfu ph\u1ea3i s\u1eed d\u1ee5ng inlay ngu\u1ed9i trong m\u1ed9t s\u1ed1 \u0111i\u1ec1u ki\u1ec7n \u0111\u1eb7c bi\u1ec7t, ch\u00fang ta c\u0169ng c\u1ea7n th\u00eam b\u1ed9t g\u1ed1m gia c\u01b0\u1eddng v\u00e0o nh\u1ef1a \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a nh\u1ef1a.<\/p>\n\n\n\n

\u0110\u1ec3 m\u00e0i cacbua xi m\u0103ng, gi\u1ea5y m\u00e0i cacbua silic l\u00e0 kh\u00f4ng c\u00f3 l\u1ef1c, v\u00ec v\u1eady ph\u1ea3i ch\u1ecdn m\u1ed9t \u0111\u0129a m\u00e0i kim c\u01b0\u01a1ng c\u1ee5 th\u1ec3. Khi l\u01b0\u1ee3ng v\u1eadt li\u1ec7u lo\u1ea1i b\u1ecf qua qu\u00e1 tr\u00ecnh m\u00e0i l\u1edbn, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u0129a li\u00ean k\u1ebft nh\u1ef1a ho\u1eb7c \u0111\u0129a li\u00ean k\u1ebft kim lo\u1ea1i 45 \u03bc M l\u00e0m b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean c\u1ee7a qu\u00e1 tr\u00ecnh m\u00e0i. Khi b\u1ec1 m\u1eb7t c\u1eaft nh\u1eb5n v\u00e0 m\u1ecbn, kh\u00f4ng c\u1ea7n th\u00e1o v\u1eadt li\u1ec7u ra, ch\u00fang ta c\u0169ng c\u00f3 th\u1ec3 ch\u1ecdn \u0111\u0129a m\u00e0i c\u1ee9ng c\u00f3 \u0111\u00e1nh b\u00f3ng th\u00f4 huy\u1ec1n ph\u00f9 kim c\u01b0\u01a1ng l\u00e0m b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean.<\/p>\n\n\n\n

M<\/strong>ethod 1<\/strong><\/p>\n\n\n\n

c\u00e1c b\u01b0\u1edbc<\/a><\/td>1<\/td>2<\/td>3<\/td>4<\/td><\/tr>
M\u1eb7t<\/td>DGD Mosaic \/ DGD Ultra<\/td>Ultrapad<\/td>VenduTex<\/td>MicroCloth<\/td><\/tr>
h\u1ea1t<\/td>45um<\/td>9um<\/td>3um<\/td>1um<\/td><\/tr>
ch\u1ea5t b\u00f4i tr\u01a1n<\/td>n\u01b0\u1edbc<\/td>N\u01b0\u1edbc u\u1ed1ng<\/td>Ch\u1ea5t l\u1ecfng metadi<\/td>Ch\u1ea5t l\u1ecfng metaldi<\/td><\/tr>
l\u1ef1c l\u01b0\u1ee3ng<\/td>30N<\/td>30N<\/td>30N<\/td>30N<\/td><\/tr>
Th\u1eddi gian<\/td>Cho \u0111\u1ebfn khi b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c l\u00e0m ph\u1eb3ng<\/td>5 ph\u00fat<\/td>3 ph\u00fat<\/td>2 ph\u00fat<\/td><\/tr>
V\u1eadn t\u1ed1c quay (v\u00f2ng \/ ph\u00fat)<\/td>200<\/td>150<\/td>150<\/td>150<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Ph\u01b0\u01a1ng ph\u00e1p 2<\/p>\n\n\n\n

c\u00e1c b\u01b0\u1edbc<\/td>1<\/td>2<\/td>3<\/td>4<\/td><\/tr>
M\u1eb7t<\/td>Apexhercules H<\/td>Apexhercules H<\/td>VenduTex<\/td>MicroCloth<\/td><\/tr>
h\u1ea1t<\/td>45um<\/td>9um<\/td>3um<\/td>1um<\/td><\/tr>
ch\u1ea5t b\u00f4i tr\u01a1n<\/td>Ch\u1ea5t l\u1ecfng metadi<\/td>Ch\u1ea5t l\u1ecfng metadi<\/td>Ch\u1ea5t l\u1ecfng metadi<\/a><\/td>Ch\u1ea5t l\u1ecfng metaldi<\/td><\/tr>
l\u1ef1c l\u01b0\u1ee3ng<\/td>30N<\/td>30N<\/td>30N<\/td>30N<\/td><\/tr>
Th\u1eddi gian<\/td>Cho \u0111\u1ebfn khi b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c l\u00e0m ph\u1eb3ng<\/td>5 ph\u00fat<\/td>3 ph\u00fat<\/td>2 ph\u00fat<\/td><\/tr>
V\u1eadn t\u1ed1c quay (v\u00f2ng \/ ph\u00fat)<\/td>150<\/td>150<\/td>150<\/td>150<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u25b6 ba \u03bc \u1ea2nh kim lo\u1ea1i c\u1ee7a vi\u00ean kim c\u01b0\u01a1ng m \u0111\u01b0\u1ee3c \u0111\u00e1nh b\u00f3ng<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u25b6 m\u1ed9t \u03bc \u1ea2nh kim lo\u1ea1i c\u1ee7a vi\u00ean kim c\u01b0\u01a1ng m \u0111\u01b0\u1ee3c \u0111\u00e1nh b\u00f3ng<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u25b6 Sau khi \u0111\u00e1nh b\u00f3ng nh\u00f4m 0,05 \u00b5 m<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u25b6 \u1ea2nh kim lo\u1ea1i tr\u01b0\u1edbc khi \u0111\u00e1nh b\u00f3ng rung<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Cu\u1ed1i c\u00f9ng, n\u1ebfu silica gel ho\u1eb7c huy\u1ec1n ph\u00f9 alumin \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u00e1nh b\u00f3ng, s\u1ebd thu \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac r\u00f5 r\u00e0ng, \u0111i\u1ec1u n\u00e0y c\u0169ng li\u00ean quan \u0111\u1ebfn s\u1ef1 ch\u00eanh l\u1ec7ch \u0111\u1ed9 c\u1ee9ng gi\u1eefa ch\u1ea5t n\u1ec1n v\u00e0 pha c\u1ee9ng. Khi b\u1ec1 m\u1eb7t c\u00f3 l\u1edbp ph\u1ee7 ch\u1ed1ng m\u00e0i m\u00f2n nhi\u1ec1u l\u1edbp, vi\u1ec7c \u0111\u00e1nh b\u00f3ng \u00f4x\u00edt l\u1ea7n cu\u1ed1i c\u0169ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n gi\u1eefa l\u1edbp ph\u1ee7 v\u00e0 l\u1edbp n\u1ec1n. Khi l\u1edbp ph\u1ee7 b\u1ec1 m\u1eb7t c\u1ea7n chu\u1ea9n b\u1ecb m\u1eabu EBSD, \u0111\u00e1nh b\u00f3ng rung c\u0169ng s\u1ebd l\u00e0m n\u1ed5i b\u1eadt s\u1ef1 chuy\u1ec3n \u0111\u1ed5i pha c\u1ee9ng c\u1ee7a l\u1edbp n\u1ec1n.<\/p>\n\n\n\n

Ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng<\/strong><\/strong><\/h2>\n\n\n\n

Rockwell \u0111\u1ed9 c\u1ee9ng<\/strong> ki\u1ec3m tra<\/strong><\/strong><\/h2>\n\n\n\n

(A) Ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra thang \u0111i\u1ec3m<\/strong><\/strong><\/h3>\n\n\n\n

1. chu\u1ea9n b\u1ecb m\u1eabu v\u00e0 c\u00e1c y\u00eau c\u1ea7u<\/strong><\/strong><\/p>\n\n\n\n

\u0110\u1ed9 nh\u00e1m c\u1ee7a b\u1ec1 m\u1eb7t m\u1eabu th\u1eed RA \u2264 2 \u03bc m\u3002 Chi\u1ec1u d\u00e0y c\u1ee7a b\u1ec1 m\u1eb7t m\u1eabu \u1edf tr\u1ea1ng th\u00e1i thi\u00eau k\u1ebft kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 0,2mm.<\/p>\n\n\n\n

Vi\u1ec7c chu\u1ea9n b\u1ecb m\u1eabu ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo c\u00e1ch gi\u1ea3m thi\u1ec3u s\u1ef1 thay \u0111\u1ed5i c\u1ee7a c\u00e1c \u0111\u1eb7c t\u00ednh b\u1ec1 m\u1eb7t do qu\u00e1 nhi\u1ec7t ho\u1eb7c d\u1eadp t\u1eaft do qu\u00e1 tr\u00ecnh x\u1eed l\u00fd<\/p>\n\n\n\n

Khi x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 c\u1ee9ng c\u1ee7a m\u1eabu c\u00f3 b\u1ec1 m\u1eb7t cong, b\u00e1n k\u00ednh cong kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 15mm. \u0110\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 c\u1ee9ng c\u1ee7a m\u1eabu th\u1eed c\u00f3 b\u00e1n k\u00ednh cong nh\u1ecf h\u01a1n 15mm, ph\u1ea3i chu\u1ea9n b\u1ecb m\u1ed9t m\u1eb7t ph\u1eb3ng R\u1ed8NG \u00edt nh\u1ea5t l\u00e0 3MM.<\/p>\n\n\n\n

\u0110\u1ed9 d\u00e0y c\u1ee7a m\u1eabu \u0111\u00e3 chu\u1ea9n b\u1ecb \u00edt nh\u1ea5t ph\u1ea3i l\u00e0 1,6mm.<\/p>\n\n\n\n

B\u1ec1 m\u1eb7t m\u1eabu th\u1eed d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a v\u1ebft l\u00f5m kim c\u01b0\u01a1ng ph\u1ea3i song song v\u1edbi b\u1ec1 m\u1eb7t \u1ed5 tr\u1ee5c v\u00e0 \u0111\u1ed9 song song c\u1ee7a n\u00f3 kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 0,1mm tr\u00ean 10mm chi\u1ec1u d\u00e0i.<\/p>\n\n\n\n

2. thi\u1ebft b\u1ecb<\/strong><\/strong><\/p>\n\n\n\n

\u0110\u1ed9 ch\u00ednh x\u00e1c \u0111o c\u1ee7a thi\u1ebft b\u1ecb th\u1eed nghi\u1ec7m kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 0,2hra.<\/p>\n\n\n\n

\u0110\u1ea7u th\u1ee5t kim c\u01b0\u01a1ng ph\u1ea3i tu\u00e2n theo c\u00e1c quy \u0111\u1ecbnh li\u00ean quan c\u1ee7a gb \/ t 230.2-2012, v\u00e0 t\u00ednh n\u0103ng c\u1ee7a \u0111\u1ea7u th\u1ee5t kim c\u01b0\u01a1ng ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra tr\u00ean m\u00e1y th\u1eed \u0111\u1ed9 c\u1ee9ng \u0111\u00e3 hi\u1ec7u chu\u1ea9n. M\u1ed9t b\u1ed9 c\u00e1c kh\u1ed1i th\u1eed nghi\u1ec7m ti\u00eau chu\u1ea9n cacbua xi m\u0103ng bao g\u1ed3m n\u0103m kh\u1ed1i th\u1eed nghi\u1ec7m. \u00cdt nh\u1ea5t n\u0103m v\u1ebft l\u00f5m ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean m\u1ed7i kh\u1ed1i \u0111\u1ed9 c\u1ee9ng ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c tr\u00e1ng xi m\u0103ng, v\u00e0 \u0111\u1ed9 c\u1ee9ng trung b\u00ecnh c\u1ee7a m\u1ed7i kh\u1ed1i ti\u00eau chu\u1ea9n v\u00e0 \u0111\u1ed9 ch\u00eanh l\u1ec7ch c\u1ee7a n\u00f3 v\u1edbi \u0111\u1ed9 c\u1ee9ng hi\u1ec7u chu\u1ea9n ph\u1ea3i \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n. T\u00ednh gi\u00e1 tr\u1ecb trung b\u00ecnh c\u1ed9ng v\u00e0 ph\u1ea1m vi c\u1ee7a n\u0103m \u0111i\u1ec3m kh\u00e1c bi\u1ec7t. N\u1ebfu gi\u00e1 tr\u1ecb trung b\u00ecnh kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 \u00b1 0,3hra c\u1ee7a gi\u00e1 tr\u1ecb hi\u1ec7u chu\u1ea9n v\u00e0 ph\u1ea1m vi kho\u1ea3ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 0,6 HRA, th\u00ec c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng th\u1ee5t l\u1ec1. Kh\u1ed1i c\u1ee9ng ti\u00eau chu\u1ea9n cacbua xi m\u0103ng ph\u1ea3i c\u00f3 t\u1ea5t c\u1ea3 ho\u1eb7c b\u1ea5t k\u1ef3 gi\u00e1 tr\u1ecb \u0111\u1ed9 c\u1ee9ng n\u00e0o sau \u0111\u00e2y: 85,5, 88,5, 91,0, 92,0 v\u00e0 93,0hra.<\/p>\n\n\n\n

3. c\u00e1c b\u01b0\u1edbc ki\u1ec3m tra<\/strong><\/strong><\/p>\n\n\n\n

Ch\u1ecdn kh\u1ed1i ti\u00eau chu\u1ea9n \u0111\u1ed9 c\u1ee9ng cacbua xi m\u0103ng g\u1ea7n nh\u1ea5t v\u1edbi gi\u00e1 tr\u1ecb \u0111\u1ed9 c\u1ee9ng (\u01b0\u1edbc t\u00ednh) c\u1ee7a m\u1eabu v\u00e0 \u0111o \u0111\u1ed9 c\u1ee9ng c\u1ee7a ba HRAS tr\u00ean kh\u1ed1i ti\u00eau chu\u1ea9n. Ch\u00eanh l\u1ec7ch gi\u1eefa gi\u00e1 tr\u1ecb trung b\u00ecnh c\u1ee7a ba l\u1ea7n \u0111\u1ecdc n\u00e0y v\u00e0 gi\u00e1 tr\u1ecb \u0111\u1ed9 c\u1ee9ng \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n b\u1edfi kh\u1ed1i ti\u00eau chu\u1ea9n ph\u1ea3i n\u1eb1m trong kho\u1ea3ng \u00b1 0,5hra.<\/p>\n\n\n\n

N\u1ebfu ch\u00eanh l\u1ec7ch l\u1edbn h\u01a1n \u00b1 0,5hra, h\u00e3y ki\u1ec3m tra m\u00e1y \u0111o \u0111\u1ed9 c\u1ee9ng v\u00e0 v\u1ebft l\u00f5m kim c\u01b0\u01a1ng, v\u00e0 lo\u1ea1i b\u1ecf nguy\u00ean nh\u00e2n g\u00e2y ra sai s\u1ed1.<\/p>\n\n\n\n

N\u1ebfu ch\u00eanh l\u1ec7ch trong kho\u1ea3ng \u00b1 0,5 gi\u1edd a, th\u00ec c\u1ed9ng ho\u1eb7c tr\u1eeb ch\u00eanh l\u1ec7ch v\u1edbi \u0111\u1ed9 c\u1ee9ng trung b\u00ecnh c\u1ee7a m\u1eabu.<\/p>\n\n\n\n

Ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng Vickers<\/strong><\/h2>\n\n\n\n

\u0110\u1ed9 dai ch\u1ed1ng \u0111\u1ee9t g\u00e3y (KIC) \u0111\u01b0\u1ee3c coi l\u00e0 \u0111\u1eb7c t\u00ednh c\u1ed1 h\u1eefu c\u1ee7a v\u1eadt li\u1ec7u, d\u00f9ng \u0111\u1ec3 ch\u1ec9 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0111\u1ee9t g\u00e3y c\u1ee7a v\u1eadt li\u1ec7u. Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m ti\u00eau chu\u1ea9n h\u00f3a th\u00f4ng th\u01b0\u1eddng c\u1ee7a KIC bao g\u1ed3m vi\u1ec7c t\u1ea1o ra m\u1ed9t v\u1ebft n\u1ee9t nh\u1ecf trong m\u1eabu th\u1eed nghi\u1ec7m v\u00e0 sau \u0111\u00f3 t\u00e1c d\u1ee5ng m\u1ed9t t\u1ea3i tr\u1ecdng c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c \u0111\u1ec3 m\u1edf r\u1ed9ng v\u1ebft n\u1ee9t. So v\u1edbi ph\u01b0\u01a1ng ph\u00e1p th\u00f4ng th\u01b0\u1eddng, ph\u01b0\u01a1ng ph\u00e1p b\u1ebb g\u00e3y l\u00f5m d\u1ec5 ki\u1ec3m tra h\u01a1n v\u00e0 c\u00f3 \u0111\u1ed9 hao h\u1ee5t m\u1eabu th\u1ea5p h\u01a1n, do \u0111\u00f3 n\u00f3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 dai \u0111\u1ee9t g\u00e3y c\u1ee7a v\u1eadt li\u1ec7u gi\u00f2n.<\/p>\n\n\n\n

Khi x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 dai \u0111\u1ee9t g\u00e3y c\u1ee7a v\u1eadt li\u1ec7u gi\u00f2n, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i ch\u1ecdn c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh ch\u00ednh x\u00e1c theo h\u00ecnh th\u00e1i v\u1ebft n\u1ee9t v\u00e0 \u0111\u1eb7c t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u \u0111\u1ec3 t\u00ednh to\u00e1n \u0111\u1ed9 dai \u0111\u1ee9t g\u00e3y. Ki\u1ec3m tra \u0111\u1ed9 b\u1ec1n c\u1ee7a v\u1ebft n\u1ee9t l\u00f5m l\u00e0 \u0111\u1ec3 \u01b0\u1edbc t\u00ednh KIC c\u1ee7a v\u1eadt li\u1ec7u b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c v\u1ebft n\u1ee9t t\u1ea1o ra b\u1edfi v\u1ebft l\u00f5m \u0111\u1ed9 c\u1ee9ng Vickers. C\u00e1c v\u1ebft n\u1ee9t n\u00e0y \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh b\u1eb1ng c\u00e1ch t\u00e1c d\u1ee5ng t\u1ea3i tr\u1ecdng cao l\u00ean m\u1ed9t m\u1eabu v\u1eadt li\u1ec7u th\u1eed nghi\u1ec7m nh\u1ecf b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng \u0111\u1ea7u \u0111o \u0111\u1ed9 c\u1ee9ng Vickers.<\/p>\n\n\n\n

Nh\u01b0 th\u1ec3 hi\u1ec7n trong h\u00ecnh b\u00ean d\u01b0\u1edbi, c\u00f3 m\u1ed9t v\u1ebft n\u1ee9t k\u00e9o d\u00e0i t\u1eeb m\u1ed7i g\u00f3c nh\u1ecdn trong bi\u00ean d\u1ea1ng v\u1ebft n\u1ee9t l\u00fd t\u01b0\u1edfng:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 c\u1ea5u h\u00ecnh v\u1ebft n\u1ee9t k\u00e9m nh\u01b0 sau. N\u1ebfu c\u00f3 qu\u00e1 nhi\u1ec1u v\u1ebft n\u1ee9t ho\u1eb7c chi\u1ec1u d\u00e0i v\u1ebft n\u1ee9t kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u, kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ed9 c\u1ee9ng \u0111\u1ec3 \u01b0\u1edbc t\u00ednh KIC:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Th\u01b0\u1eddng c\u00f3 hai lo\u1ea1i v\u1ebft n\u1ee9t xung quanh v\u1ebft l\u00f5m, \u0111\u00f3 l\u00e0 v\u1ebft n\u1ee9t palmqvist v\u00e0 v\u1ebft n\u1ee9t \u1edf gi\u1eefa. B\u00e0i b\u00e1o n\u00e0y gi\u1edbi thi\u1ec7u s\u01a1 l\u01b0\u1ee3c v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n v\u1ebft n\u1ee9t tr\u00ean cacbua xim\u0103ng. HV30 th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0m thang \u0111o.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

T\u1ea5t nhi\u00ean, c\u00e1ch \u0111\u01a1n gi\u1ea3n nh\u1ea5t l\u00e0 ch\u1ecdn ph\u1ea7n m\u1ec1m \u0111o, sau \u0111\u00f3 l\u1ea5y tr\u1ef1c ti\u1ebfp d\u1eef li\u1ec7u \u0111o \u0111\u1ec3 t\u00ednh to\u00e1n th\u1ed1ng k\u00ea:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Cacbua xi m\u0103ng l\u00e0 m\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u h\u1ee3p kim \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf b\u1eb1ng qu\u00e1 tr\u00ecnh luy\u1ec7n kim b\u1ed9t s\u1eed d\u1ee5ng c\u00e1c h\u1ee3p ch\u1ea5t c\u1ee9ng c\u1ee7a kim lo\u1ea1i ch\u1ecbu l\u1eeda nh\u01b0 cacbua vonfram (WC) ho\u1eb7c cacbit lo\u1ea1i MC kh\u00e1c v\u00e0 c\u00e1c kim lo\u1ea1i li\u00ean k\u1ebft. C\u00e1c kim lo\u1ea1i li\u00ean k\u1ebft ch\u1ee7 y\u1ebfu l\u00e0 coban, niken v\u00e0 s\u1eaft. Chu\u1ea9n b\u1ecb kim lo\u1ea1i N\u00f3i chung, m\u00e1y c\u1eaft ch\u00ednh x\u00e1c c\u00f4ng su\u1ea5t cao v\u00e0 l\u01b0\u1ee1i c\u1eaft kim c\u01b0\u01a1ng (20lc)\u2026<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/21174"}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/comments?post=21174"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/21174\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=21174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=21174"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=21174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}