摘要：用光学显微镜，显微硬度计及拉伸试验机等试验设备，对马氏体不锈钢热处理后的显微组织及力学性能变化进行了分析。结果表明，相同加热温度下，随着淬火温度的延增加，晶粒逐渐粗化，硬度值逐渐减小，屈服强度和抗拉强度缓慢下降；相同保温时间下，随着加热温度的增加，晶粒逐渐粗化，硬度值逐渐减小；相同加热温度和保温时间下，空冷的试样比水冷的试样晶界窄，硬度低。回火时，随着温度的升高，屈服强度和抗拉强度与延伸率成反比，延伸率随温度升高而上升。综合以上，通过计算（抗拉强度与延伸率的乘积大小）得出马氏体不锈钢热处理较好工艺为1100℃淬火空冷和700℃回火，得到组织有较好的综合力学性能。24269
毕业论文关键词：马氏体不锈钢；热处理；显微组织；硬度值
Research on Heat Treatment Processes of Martensite Steel
Abstract： By optical microscopy, micro-hardness and tensile testing machine and other test equipment, changes in the microstructure and mechanical properties of martensitic stainless steel after heat treatment were analyzed. The results showed that under the same heating temperature, the quenching temperature increases delay, and gradually grain coarsening, the hardness decreases, yield and tensile strength decreased slowly; the same retention time, as the heating temperature increases, crystal gradually coarse grain hardness value decreases; under the same heating temperature and holding time, the specimen sample grain boundaries than air-cooled water-cooled narrow, low hardness. Tempering, as the temperature rises, the yield strength and tensile strength and elongation is inversely proportional to the elongation increased with increasing temperature. Based on the above, by calculating (the product of the size of the tensile strength and elongation) obtained better martensitic stainless steel heat treatment process for the 1100 ℃ and 700 ℃ air-cooled quenching and tempering, give the organization a better mechanical properties.
Key Words： Martensite steel；solution treatment；microstructure；hardness
目 录
1 绪论 1
1.1不锈钢的简述 1
1.1.1 简介 1
1.1.2 研究概况 1
1.1.3 不锈钢热处理工艺概况 4
1.1.4 不锈钢硬度检测概况 6
1.1.5 目前需要解决的问题 6
1.2 选题的目的和意义 7
1.3 研究的目标和内容 8
1.3.1 研究目标 8
1.3.2 研究内容 8
2 实验材料和方案 9
2.1 实验原料参数 9
2.2 实验设备 9
2.2.1 数控电火花线切割机 9
2.2.2 固溶炉 10
2.2.3 回火炉 11
2.2.4 金相试样抛光机 11
2.2.5 光学金相显微镜 12
2.3 实验方案 13
2.4 实验过程及操作 14
2.4.1 淬火 14
2.4.2 回火 14
2.4.3 制备观察试样 15
2.4.4 观察金相试样 15
2.4.5 测量试样硬度 15
2.4.6 拉伸性能 15
3 实验结果及讨论分析 16
3.1 热处理工艺对组织的影响 16
3.1.1淬火温度和冷却方式对组织的影响 18
3.1.2 淬火保温时间对组织的影响 18
3.1.3 回火温度对组织的影响 20
3.1.4 回火保温时间对组织的影响 22
3.1.5 淬火-碳分配热处理实验 25 马氏体不锈钢热处理工艺研究:http://www.751com.cn/huaxue/lunwen_17704.html