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Q. |
If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be |
A. | Impure quenching oil |
B. | Low specific heat of quenching oil |
C. | Excessive proportion of alloying elements |
D. | Non-uniform heating or cooling |
E. | Low temperature during heating |
Answer» D. Non-uniform heating or cooling |
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