X65钢表面热丝脉冲TIG堆焊Inconel625合金分析-材料加工工程专业论文.docxVIP

an approximate calculation of the dilution by means of theoretical derivation. The results of the changing trend of the forming parameters are consistent with the experimental results. Finally, the microstructural and mechanical characterizations of Inconel 625 cladding and the influence of the welding current on the microstructure and property of the cladding were studied. The results show that there are several discontinuous partially-mixed zones （PMZ）and bright planar band at the bottom of the cladding. The increasing of weld current will reduce the area of PMZ and increase the width of planar. There are fewer precipitates at the bottom and top part than the middle part. The precipitates are mainly granular MC when the weld current is lower. When the current is higher, the precipitates are mainly irregular Laves phase. There is no harden region on the side of the cladding. The increasing of the weld current will slightly decrease the hardness of the cladding. KEY WORDS： hot wire P-TIG, the transverse welding cladding, Inconel 625, response surface methodology 目 录 HYPERLINK \l _bookmark0 第一章 绪 论1 HYPERLINK \l _bookmark1 1.1 选题背景及意义1 HYPERLINK \l _bookmark2 1.2 热丝 TIG 堆焊技术 2 HYPERLINK \l _bookmark3 1.3 镍基耐蚀合金5 HYPERLINK \l _bookmark4 1.3.1 镍基耐蚀合金中的主要元素6 HYPERLINK \l _bookmark5 1.3.2 镍基合金焊接的问题6 HYPERLINK \l _bookmark6 1.4 管线钢7 HYPERLINK \l _bookmark7 1.5 堆焊技术的研究现状与发展趋势7 HYPERLINK \l _bookmark8 1.5.1 堆焊工艺8 HYPERLINK \l _bookmark9 1.5.2 堆焊层组织性能9 HYPERLINK \l _bookmark10 1.6 课题研究目标与内容10 HYPERLINK \l _bookmark11 第二章 试验材料及方法11 HYPERLINK \l _bookmark12 2.1 试验材料11 HYPERLINK \l _bookmark13 2.1.1 基体材料11 HYPERLINK \l _bookmark14 2.1.2 堆焊材料11 HYPERLINK \l _bookmark15 2.2 堆焊设备12 HYPERLINK \l _bookmark16 2.3 试验方法13 HYPERLINK \l _bookmark17 2.3.1 响应面法13 HYPERLINK \l _bookmark18 2.3.2 稀释率的测定14 HYPERLINK \l _bookmark19 2.3.3 金相制备与观察15 HYPERLINK \l _bookmark20 2.3.4 显微组织观察15 HYPERLINK \l _bookmark21 2.3.5 显微硬度测试15 HYPERLINK \l _bookmark22