吴战芳,车立达,刘振宇,李向阳

• 1:东北大学材料科学与工程学院
• 2:钢研昊普科技有限公司
• 3:中国钢研科技集团有限公司

摘要(Abstract)：

通过设计一套可开模的水冷铜模装置,研究了不同连续冷却工艺对先进高强度钢显微组织和断裂韧性的影响。为研究试验钢的裂纹形成及扩展机理,对试样中不同类型夹杂物在基体中所产生的径向应力进行了计算以及应用了一种新方法来表征试验钢裂纹的扩展行为。结果表明:试验钢在固相线附近进行缓慢冷却有利于形成更多的MnS+Al_2O_3复合夹杂物,与单一的Al_2O_3夹杂相比,复合夹杂周围的径向应力明显降低。试验钢在临界铁素体转变温度以下缓慢冷却,有助于获得更多的晶内多边形铁素体,晶内多边形铁素体对裂纹扩展有抑制作用,因此试验钢的断裂韧性更高。

关键词(KeyWords)： 先进高强度钢(AHSS);断裂韧性;裂纹扩展;夹杂物;铁素体

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 吴战芳,车立达,刘振宇,李向阳

DOI: 10.13289/j.issn.1009-6264.2020-0120

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