Effects of laser shock processing on microstructure and mechanical properties of K403 nickel-alloy

被引：56
|
作者：
Wang, C. [1 ]
Shen, X. J. [1 ]
An, Z. B. [1 ]
Zhou, L. C. [1 ]
Chai, Y. [1 ]
机构：
[1] Air Force Engn Univ, Engn Coll, Plasma Dynam Lab, Xian 710038, Shanxi, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 89卷
基金：
中国国家自然科学基金;
关键词：
Laser shock processing; Super alloy K403; Nanocrystals; Residual stress; Microhardness; Fatigue life; FATIGUE LIFE; IMPACTS;
D O I：
10.1016/j.matdes.2015.10.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Owing to the cracks, fracture problem of nickel-based alloy K403 casting components, the effect of multiple impacts on the mechanical properties and microstructure of the K403 nickel alloy subjected to laser shock processing were investigated. Microhardness, residual stress and fatigue life were tested on samples to analyze the mechanical properties, and X-ray diffraction and transmission, electron microscopy (TEM) analyses were used to investigate the microstructure evolution. Microhardness and residual stress of the K403 nickel alloy were improved, by forming a plastic deformation layers. Additionally, increasing the numbers of impacts improved the hardness and residual effect depth. Similarly, the fatigue lives of samples subjected to 3 impacts increased by 244%. Meanwhile, TEM analysis indicated that a randomly-oriented nanoaystal formed after 3 impacts. In addition, the research on the mechanism of grain refinement of the K403 nickel alloy is discussed. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：582 / 588
页数：7
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