热处理对ZG30Cr2Mn2Si力学性能和组织影响.pdf

维普资讯 学兔兔 Jan．2o08 铸 造 Vo1．57 NO．1 FOUNDRY 热处理对ZG30Cr2Mn2Si力学性能及组织的影响 吴鹏飞，刘向东，车广东，路 焱，王建民，李进福 (内蒙古工业大学材料科学与工程学院，内蒙古呼和浩特010051) 摘要：热处理工艺对铸钢的组织和性能有重要的影响。合金的化学成分、组织及结构不同，要求的热处理工艺也不尽 相同，必须通过试验来确定合理的热处理工艺。本试验结果表明，含1．5wt％Cr、1．5wt％Mn、1．Owt％Si并用少量稀土对 ZG30Cr2Mn2Si进行变质处理，采用900℃油淬+200℃回火时，其抗拉强度、硬度和冲击韧性分别为l 801 MPa、HRC 55．1 和15 J／cm2。其组织为马氏体和贝氏体组织；用扫描电镜对试样的冲击断口形貌进行观察发现，断口表面有大量的韧 窝，且分布较均匀，属于韧性断裂。 关键词：热处理；zG30cr2Mn2Si；力学性能；微观组织 中图分类号：TG162 9；TG142．1文献标识码：A 文章编号：1001—4977(2008)01—0063—03 EffectS Of Heat．Treatment Process on MechanicaI Properties and Microstructure Of ZG3OCr2Mn2Si WU Peng-fei，LIU Xiang-dong，CHE Guang-dong，LU Yan，WANG Jian-min，LI Jin-fu (School of Material Science and Technology，Inner Mongolia University of Technology， Huhhot，01 0051，Inner Mongolia，China) Abstract： Heat treatment has an important influence on microstructure and properties of cast steels．Steels with variable chemicaI composition，microstructure，size and shape need different heat treatment process．SO reasonable process must be determined by experiments,The experimental results in this study showed that the tensile strength,hardness and impact toughness of the alloy containing 1．5wt％Cr，1．5wt％Mn，1．0wt％Si and modified by RE are 1 801 MPa，55．1 HRC，and 1 5 J／cm2，respectively，after normalized at 900℃and tempered at 200 oC．The microstructure of the alloy iS composed of martensite and bainite．The SEM results indicateed that the fracture mode in the impact fracture SUdaces of samples iS ductile fracture．and there are a great number of dimples distributed uniformly． Key wor