No matter how cool the quenching medium may be, if the heat inside a large piece cannot escape faster than a certain criticalrate, there is a definite limit to the inside hardness.
The quenching operation is the most critical part of the heat treatment since too slow a rate of cooling might give rise to either soft spots or quenching cracks.
自太慢地冷却的比率也可能引起软的地点或淬熄裂缝之后,淬熄操作是热处理的最紧要关头的部份。
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Abstract The critical cooling rate of steel is very important in heavy plate quenching process, and it is the basis of the cooling process.