镍基合金表面细晶结构的制备和表征

摘要本文的研究目的为在一种新型镍基合金材料表面实现细晶结构的制备和表征。通过喷丸设备对镍基合金进行高速变形处理，实现表面变形层的制备。利用光学显微镜、扫描电子显微镜及微观硬度实验系统研究了镍基合金表面喷丸处理后的微观结构与力学性能，并确定了结构、力学性能的梯度变化。通过与固溶处理后样品的微观结构进行比较发现，样品表面晶粒结构的细化及析出相的细化与回溶。另外硬度实验表明，通过喷丸处理镍基合金的表面晶粒及析出相的明显细化，硬度相对于固溶处理的样品提升了20%。87875

毕业论文关键词固溶处理喷丸处理细晶结构梯度变化

毕业设计说明书外文摘要

Title Small-grained structures in the surface of a polycrystalline Ni-based alloy

Abstract The achievement and characterization of small-grained structures in the surface of a polycrystalline Ni-based alloy was present。 Shot peening was used to achieve the high strain and high strain rates strain on the surface of a newly developed Ni-based alloy。 Optical and scanning electron microscopes were utilized to observe the microstructure before and after shot peening treatments。 Microhardness testing was used to measure the hardness variation along the distance from the treated surface。 The results demonstrate that the grained structure and precipitates were refined significantly with the partial dissolution of precipitates。 The microhardness measurements show that the hardness on the treated surface was promoted by 20% due to the refinement of the grain structures and precipitates。

Keywords Solid solutioning，Shot peening，Small-grained structures，Gradient

1 引言 1

1。1研究背景 1

1。2 喷丸处理 1源-于,优Y尔O论U文.网wwW.youeRw.com 原文+QQ75201,8766

1。3 镍基合金中添加元素的影响 1

1。4 镍基合金发展现状 6

1。5 本次毕业设计探索的内容、目标及创新性 6

2 实验材料及方法 8

2。1 实验材料 8

2。2 实验路线及方案 8

2。3 实验设备 9

2。4 实验方法 10

3 镍基合金显微组织观察 13

3。1 原始样品的显微组织观察 13

3。2 固溶处理后的显微组织观察 13

3。3 喷丸处理后的显微组织观察 15

4 镍基合金性能变化分析 18

4。1 镍基合金组织变化观察 20

4。2 镍基合金显微硬度变化 20

4。3 镍基合金细晶结构对硬度变化的影响分析 22

结论镍基合金表面细晶结构的制备和表征:http://www.youerw.com/cailiao/lunwen_149321.html