热处理制度对防落梁用Q345E钢组织与性能的影响  

Effects of Heat Treatment on Microstructure and Properties of Q345E Steel for Unseating Prevention

作　　者：孙永伟 王灵水 SUN Yongwei;WANG Lingshui(Luoyang Shuangrui Special Equipment Co.,Ltd.,Luoyang Ship Material Research Institute,Luoyang 471000,China)

机构地区：[1]洛阳船舶材料研究所洛阳双瑞特种装备有限公司,河南洛阳471000

出　　处：《热加工工艺》2021年第6期115-119,共5页Hot Working Technology

基　　金：河南省重大科技专项项目(182102210437)。

摘　　要：针对低合金高强度钢Q345E存在低温冲击功低的问题,采用常规拉伸试验机、金相显微镜、扫描电子显微镜及透射电镜对该钢的力学性能、显微组织、断口形貌等进行测试和观察。结果表明,利用合适的正火热处理制度(960℃/5 h)对不合格Q345E钢棒进行热处理,获得了性能合格的供货成品;晶粒度和显微组织类型、比例是影响该钢低温冲击韧性的主要因素。In view of the low temperature impact energy of low alloy high strength steel Q345 E, the mechanical properties, microstructure and fracture morphology of low alloy high strength steel Q345 E were measured and observed by conventional tensile tester, metallographic microstructure, scanning microstructure electron and transmission electron microscopy. The results show that, the unqualified Q345 E steel bar is heat-treated by proper hot treatment system(960 ℃/5 h), and the quality of the finished product is obtained. The grain size, microstructure type and ratio are the main factors affecting the low temperature impact toughness of the steel.

关 键 词：低合金高强度钢 低温冲击功 晶粒度 组织 相比例 

分 类 号：TG161[金属学及工艺—热处理]