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常州熱處理加工廠家為你介紹你知道回火脆性嗎

來源www.agroison.com 2018-03-31
    回火脆性:指淬火鋼在某些溫度區間回火或從回火溫度緩慢冷卻通過該溫度區間的脆化現象;鼗鸫嘈钥煞譃榈谝活惢鼗鸫嘈院偷诙惢鼗鸫嘈。第一類回火脆性又稱不可逆回火脆性,主要發生在回火溫度為250~400℃時,在重新加熱脆性消失后,重復在此區間回火,不再發生脆性,第二類回火脆性又稱可逆回火脆性,發生的溫度在400~650℃,當重新加熱脆性消失后,應迅速冷卻,不能在400~650℃區間長時間停留或緩冷,否則會再次發生催化現象;鼗鸫嘈缘陌l生與鋼中所含合金元素有關,如錳,鉻,硅,鎳會產生回火脆性傾向,而鉬,鎢有減弱回火脆性傾向。
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