对冷轧态、淬火态、球化态三种低合金高强钢进行了奥氏体化阶段不同加热速率(5, 300 ℃·s-1)下的淬火-配分(Q&P)热处理, 研究了加热速率对其最终显微组织和拉伸性能的影响。结果表明: 在奥氏体化阶段快速(300 ℃·s-1)加热对冷轧态钢具有明显的晶粒细化以及加速奥氏体形成的作用, 而对淬火态和球化态钢的奥氏体形成过程基本没有影响; 经快速加热Q&P处理后, 冷轧态钢的抗拉强度比慢速(5 ℃·s-1)加热后的提高90 MPa, 伸长率仅降低0.9%, 而加热速率对球化态及淬火态钢Q&P处理后的拉伸性能影响较小; 经慢速加热Q&P处理后, 冷轧态和球化态钢中硬质相沿再结晶铁素体晶界呈条带状分布, 变形时易产生孔洞。
所属栏目
材料性能及应用国家“十二五”科技支撑计划项目(2011BAE13B01)
收稿日期
2016/2/262016/9/20
作者单位
刘赓:北京科技大学材料科学与工程学院, 北京 100083
张深根:北京科技大学新材料技术研究院, 北京 100083
刘波:北京科技大学新材料技术研究院, 北京 100083
备注
刘赓(1988-), 男, 黑龙江双鸭山人, 博士研究生。
引用该论文:
LIU Geng,ZHANG Shen-gen,LIU Bo.Effects of Heating Rate on Microstructure and Property of Low-Alloy High-Strength Steel in Different States after Q&P Treatment[J].Materials for mechancial engineering,2016,40(12):92～98
刘赓,张深根,刘波.加热速率对不同状态低合金高强钢Q&P处理后组织和性能的影响[J].机械工程材料,2016,40(12):92～98
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