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摘要论文根据9Cr2WVTa低活化钢差热分析曲线设计了不同的热处理工艺，然后对比不同热处理工艺下实验钢的组织和力学性能选择最佳热处理工艺，并研究了最佳热处理工艺下实验钢的蠕变性能。利用光学显微镜和扫描电子显微镜观察了材料的显微组织，利用SEM观察拉伸断口和蠕变断口，用X射线衍射仪检测了材料的晶体结构。有以下的结论：不同热处理工艺下实验钢组织和室温拉伸性能有明显差别，文氏硬度差别不大。1050℃保温30min水冷760℃回火90min空冷，作为最佳热处理工艺，处理后实验钢静力韧性和塑性都是最好。对最佳热处理工艺下实验钢最小蠕变速率和蠕变寿命分析，实验钢应力因子为27，显示为位错控制蠕变变形机制。19193
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关键词：9Cr2WVTa低活化钢，化热处理，显微组织，拉伸性能，蠕变性能
毕业论文设计说明书（论文）外文摘要
Title Effect of heat treatment on the microstructure and Properties of 9Cr2WVTa reduced activation steels
Abstract
The creep property of 9Cr2WVTa reduced activation steels was studied after the optimized heat treatment, which was chose based on the microstructure and mechanical properties under different heat treatment process. The microstructure was observed by optical microscopy, the tensile and creep fracture surfaces were observed by SEM, and X-ray diffraction analysis. The results show that: there is little difference in Vickers hardness of the 9Cr2WVTa reduced activation steels after different heat treatment process, the microstructure and tensile property are significantly different. According to the assessment method of static toughness, we have chosen the heat treatment process which gets the best static toughness on the promise of good ductility, that is 1000℃/30min/air cooling+760℃/90min/ air cooling. We have analyzed the minimum creep rate and creep life of 9Cr2WVTa reduced activation steels under the optimized heat treatment, the stress exponent was 27, indicating the disloeation creep mechanism.
Keywords 9Cr2WVTa reduced activation steels; heat treatment; microstructure; tensile properties; creep properties
目录
1 绪论 1
1.1 研究意义 1
1.2 低活化马氏体钢发展概况 1
1.3 典型低活化马氏体钢的力学性能 2
1.3.1 9Cr-2WVTa钢 2
1.3.2 F82H钢 3
1.3.3 JLF系列 3
1.3.4 EUROFER97钢 3
1.3.5 CLAM钢 4
1.4 关键问题 4
1.5 多晶材料的力学性能及其改善方法 5
1.5.1 多晶材料的静态拉伸力学性能及其改善方法 5
1.5.2 多晶材料的高温蠕变性能 9
1.6 结束语 12
1.7 论文的主要研究内容 12
2 实验过程及方法 14
2.1 实验材料 14
2.2 实验仪器 14
2.3 实验流程 14
2.4 实验方法 15
2.5 分析测试方法 16
2.5.1 常温拉伸力学性能测试 16
2.5.2 高温蠕变力学性能测试 16
2.5.3 断口形貌、微观组织观测 17
3 实验原材料的分析 18
3.1 化学成分分析 18
3.2 热轧态组织及DSC分析 19
4 热处理对组织的影响 20
4.1 固溶温度和时间对组织的影响 20
4.2 热处理对晶界的影响 22