摘要本文探索和研究了Ni-Cr-Mo合金的热处理工艺。对锻态合金在1100℃、1120℃、1140℃以及1160℃分别进行固溶处理，将1140℃固溶处理6h的试样在980℃、1000℃、1020℃、1040℃分别进行稳定化处理，然后使用全自动维氏硬度计测硬度，使用X射线衍射仪进行物相分析，使用金相显微镜观察金相组织，研究固溶处理和稳定化处理对合金组织性能的影响。通过对比分析确定出最佳固溶工艺和最佳稳定化工艺。在750℃下进行长时间热处理，通过扫描电镜和能谱仪分析氧化膜的形成，研究合金的高温抗氧化性能。结果表明，1140℃×4h为最佳固溶工艺，此时晶粒度为6。1,满足要求，未溶相基本溶解，硬度达到214。536HV。1000℃×6h为最佳稳定化工艺，此时NbC充分析出，Cr、Mo元素溶进基体，晶粒没有发生明显长大，合金硬度达到230。759HV。750℃×200h时只形成薄层氧化膜，合金的抗氧化性能优异。86472
毕业论文关键词：镍基合金；固溶处理；稳定化处理；敏化处理；核电
Abstract The effects of solution treatment and stabilization treatment on the microstructure and properties of the Ni-Cr-Mo alloy have been studied。 Alloy samples were at 1100℃,1120℃,1140℃ and 1160℃ solution treatment。 The samples were at 980℃,1000℃,1020℃,1040℃ stabilization treatment which through 1140℃×4h solution treatment。 The alloy hardness was measured with Vickers-hardness tester。 Phase of the alloy was analysed with XRD。 The microstructure of the alloy was observed with optical microscope。 The solution process and stabilization process were determined through analyzing dates。 The Oxide film was analysed through SEM and EDS after 750℃ long time heat treatment。 Then the high temperature oxidation resistance of alloy was studied。 The results showed that the alloy hardness was up to 265。636HV and the grain size is 6。1 level when the alloy at the solution process:1140℃×4h。 The phase of the NbC was appeared to separate out sufficiently, the grain size of the alloy was similar with which at solution treatment, It’s hardness was up to 230。759HV when the alloy at the stabilization process: 1000℃×6h。 The Oxidation resistance of the alloy is great at 750℃ and the alloy was hardly oxidized when the treatment for 200h。
Keywords: Nuclear Power; Nickel-based Alloy; Solution treatment; Stabilization treatment; Sensitizing treatment
目 录
第一章 绪论 1
1。1 课题背景 1
1。2 核电 1
1。2。1 核电的特点 2
1。2。2 核电的发展及趋势 3
1。2。3 核电机组材料 3
1。2。4 核电待解决的问题 4
1。3 镍基合金的特性分类及应用 5
1。3。1 特点 5
1。3。2 分类 6
1。3。3 镍基合金的应用 11
1。4 镍基合金的热处理工艺 12
1。4。1 工艺原理与要求 12
1。4。2 热处理工艺研究进展 12
1。5 本课题研究目的与意义 13
第二章 实验材料及实验方法 14
2。1 实验材料及设备 14
2。1。1 实验材料 核电用镍基合金热处理工艺研究:http://www.youerw.com/cailiao/lunwen_106259.html