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什么是回火?回火的目的是什么?

文章出處:責任編輯:
人氣:-發表時間:2016-07-19【

(1)回火

將淬火得到馬氏體的鋼加熱到不超過Ac1臨界溫度進行保溫,而后冷卻下來,以調整和改善鋼性能的一種熱處理操作,稱為回火。有時候對于大型鑄件、鍛件進行正火處理之后也采用相似的工藝處理也叫做回火。

(2)回火的主要目的

①降低脆性,消除或減少內應力;

②獲得工件所要求的力學性能;

③穩定工件尺寸;

④對于退火難以軟化的某些合金鋼,在淬火(或正火)后常采用高溫回火,使鋼中碳化物適當聚集,將硬度降低,以利切削加工。另一方面也減少大型鑄件、鍛件的冷卻應力。


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