回火热处理对低碳微合金钢工艺性能的影响研究
关键词： 低碳微合金钢；回火；硬度；冲击韧性；显微组织
Effects of Tempering Process on the Properties of Low-carbon Micro-alloyed Steel
Abstract: In this study, the effects of tempering process on the properties of low-carbon micro-alloyed steel were investigated. The low-carbon micro-alloyed steel samples were divided into 10 parts. Then the samples were respectively tempered at temperatures of 200, 250, 300, 350, 400, 450, 500, 550 and 600℃ for 2 hours and then air-cooled. The hardness, impact toughness and microstructure of these samples were analyzed and compared, and identify the cause of the deformation of the steels. The result showed the properties of low-carbon micro-alloyed steel after tempering compared with quenching were maintaining a certain strength, toughness up and volume down. Tempering at 550℃ will produce temper brittleness, when steel tempering need to avoid temper brittleness.
Key Word: low-carbon micro-alloyed steel; tempering; hardness; impact toughness; microstructure
目录
1文献综述 1
1.1 选题背景 1
1.2 微合金钢 2
1.3 我国微合金钢的现状 2
1.4 相关基础知识 4
1.4.1 淬火 4
1.4.2 回火 4
1.4.3 硬度 6
1.4.4 回火脆性 6
1.4.5 马氏体 8
1.4.6 贝氏体 8
1.4.7 彩色金相 9
1.4.8 合金元素对钢铁转变的影响 9
2实验设备及内容 11
2.1实验设备 11
2.1.1 高温箱式炉 11
2.1.2 洛氏硬度机 11
2.1.3 摆锤式冲击试验机 12
2.1.4 金相试样切割机 13
2.1.5 镶嵌机 14
2.1.6 金相显微镜 15
2.2 实验内容 16
2.2.1 切割试样 16
2.2.2 回火热处理 16
2.2.3 硬度测试 16
2.2.4 冲击试验 16
2.2.5 金相实验 16
2.2.6 彩色金相 17
3实验结果与讨论 18
3.1 硬度测试 18
3.2 冲击试验 19
3.3 金相实验 21
3.4 彩色金相 23
3.5 结论 24
4致谢 26
5参考文献 27,3790
2 实验设备及内容
2.1 实验设备
2.1.1 高温箱式炉
仪器名称：高温箱式炉（图2-1）
仪器型号：SXL-1200