单词 | McQuaid-Ehn test |
释义 | McQuaid-Ehn test [mǝ`kwād `ān ´test] METALLURGY A test for determining the grain-size characteristics of a steel in which a sample is carburized for 8 hours at 1700°F (927°C) and cooled slowly; the high-carbon case on slow cooling will reject cementite at the austenite grain boundaries and, by polishing and etching, the grains will clearly be seen under a microscope. |
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