文档介绍：内蒙古科技大学本科生毕业论文题目: 45 号钢和 20CrMoA 钢淬火组织的研究学生姓名:杜兆星学号: 0603107 120 专业:金属材料工程班级:材料 2006-1 班指导教师:韩强讲师刘宗昌教授内蒙古科技大学本科生毕业论文 I 45 号钢和 20CrMoA 钢淬火组织的研究摘要马氏体相变是材料科学固态相变中重要的相变转变。随着工业生产中广泛应用钢的淬火, 钢中马氏体相变研究更加获得重视,近代有色合金和陶瓷中的马氏体相变研究, 也多借鉴对钢研究的成果。本次实验对 45 号钢和 20CrMoA 钢进行了退火、淬火,利用 Quanta 400 扫描电子显微镜和蔡司金相显微镜对 45 号钢和 20CrMoA 钢的退火平衡组织和淬火组织进行了观察和照相,并测量了两种钢的硬度。通过对金相组织照片的分析可得: 1200 ℃保温半小时,冰盐水淬火后,在 45 号钢和 20CrMoA 钢中得到粗大的板条状马氏体,测算其板条宽度分别为 μm和 μm ;使用 SEM 观测 45 号钢的淬火组织可以看到典型的魏氏组织。关键词: 45号钢; 20CrMoA 钢;马氏体;魏氏组织内蒙古科技大学本科生毕业论文 II Research on the quenching of 20CrMoA and 45# steel Abstract Martensitic transformation isa phase transformations which is an important transformation in solids for materials science 。 The studying of martensitic transformation in steel get more attention as the hardening is used in industrial production in recent years 。 Modern martensitic transformation research in non-ferrous alloys and ceramics is also drawing on the research of steel 。 This article selection quenching 20CrMoA and 45# steel to study for going a step further studying of mechanism of martensite transformation 。 We use a Philips Quanta 400 scanning electron microscope and zeiss optical microscope in the experiment to observe and photograph the balance and anization of45 steel and 20CrMoA 。 We also measured the hardness of the two steels 。 The analysis of microstructure photo shows that the 45# and 20CrMoA steel produce thick steel lath martensite after 1200 ℃ heat for half anhour and ice brine quenching 。 And then we measured its width of lath was μm and μm; we can also see the typical widmanstatten using SEM observation of45 steel quenching 。 Key words :45# steel ; 20CrMoA steel ; martensite ; widmanstatten structure 内蒙古科技大学毕业设计说明书(毕业论文) III 目录 45号钢和 20CrMoA 钢淬火组织的研究............................................................................ I 摘要................................................................................................................................. I Abs