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研究了双重淬火工艺对40Cr钢的奥氏体晶粒大小、显微组织和冲击韧性的影响。发现双重淬火促进混晶出现和超高温双重淬火引起第二次淬火时的奥氏体晶粒粗化和产生粗大晶粒的遗传,从而使其冲击韧性下降。并指出,高温淬火引起40Cr钢形成的单一色调的束状马氏体不是板条马氏体,而是片状马氏体的一种新形态—束状薄片马氏体。超高温预先淬火并不能使40Cr钢生成板条马氏体,而只能生成束状薄片马氏体。
The effects of dual quenching process on austenite grain size, microstructure and impact toughness of 40Cr steel were studied. It is found that dual quenching promotes the appearance of mixed crystals and dual quenching at ultrahigh temperature, resulting in austenite grain coarsening and coarse grain inheritance during the second quenching, resulting in a decrease of impact toughness. And pointed out that the high temperature quenching caused 40Cr steel to form a single tone beam-like martensite martensite is not lath, but a new form of lamellar martensite - bundled lamellar martensite. Pre-quenching ultra-high temperature and can not make 40Cr steel lath martensite, and can only generate bundled martensite.