65Mn钢连铸坯高温热塑性研究  

Study on high temperature thermoplasticity of 65Mn steel continuous casting billets

作　　者：刘少伟 赵兴通 杨灵通 韩延申 Liu Shaowei;Zhao Xingtong;Yang Lingtong;Han Yanshen(Anyang Iron&Steel Group Co.,Ltd.,Anyang 455004,China;University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]安阳钢铁集团有限责任公司,河南安阳455004 [2]北京科技大学,北京100083

出　　处：《金属制品》2024年第1期30-34,共5页Metal Products

摘　　要：采用Gleeble1500热模拟机对65Mn钢连铸坯在600~1 350℃高温力学性能进行测试,采用扫描电镜观察高温拉伸后的断口形貌和断口金相组织,分析断口断裂机理和不同温度下钢的应力-应变曲线、高温强度及热塑性。结果表明,65Mn第Ⅰ脆性区温度范围为T_(m)~1 294℃,第Ⅲ脆性区温度低于896℃,第Ⅰ脆性区断裂是由于晶界间有害杂质元素P、S、O等的富集,而第Ⅲ脆性区主要是由于奥氏体向铁素体转变区的两相区脆化导致。通过对钢的高温力学性能研究,为65Mn钢连铸坯表面及内部质量控制提供依据。High temperature mechanical properties of 65Mn steel continuous casting billets were tested using Gleeble1500 thermal simulator in 600~1 350 ℃.Using SEM to observe morphology and microstructure of fracture surface after high temperature tensile testing,analyze fracture mechanism,stress-strain curves,high temperature strength,and thermoplastic properties of steel at different temperatures.Results show that temperature range of first brittle zone of 65Mn is Tm~1 294 ℃,and temperature of third brittle zone is lower than 896 ℃.The fracture in first brittle zone is due to enrichment of harmful impurity elements P,S,O,etc.between grain boundaries,while fracture in third brittle zone is mainly caused by embrittlement of two-phase zone in austenite to ferrite transformation zone.By studying high temperature mechanical properties of steel,basis is provided for surface and internal quality control of 65Mn steel continuous casting billets.

关 键 词：65Mn 连铸坯 热塑性 断裂机理 

分 类 号：TG141[一般工业技术—材料科学与工程]