Microstructure, residual stress, and nanoindentation properties of GCr15-bearing steel by cryogenic treatment and laser-peening composite strengthening

被引：0
作者：
Aixin Feng
Bingjie Liu
Yacheng Wei
Guoxiu Xu
Chunlun Chen
Xiaoming Pan
机构：
[1] Wenzhou University,College of Mechanical and Electrical Engineering
[2] Wenzhou University,Ruian Graduate College
[3] Zhejiang Provincial Key Laboratory of Laser Processing Robots/Machinery Industry Key Laboratory of Laser Processing and Testing,undefined
来源：
Applied Physics A | 2023年 / 129卷
关键词：
GCr15-bearing steel; CT + LP; Microstructure; Residual stress; Nanoindentation properties;
D O I：
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中图分类号：
学科分类号：
摘要：
GCr15-bearing steel is widely used in generator bearings. To improve its mechanical properties, the cryogenic treatment and laser-peening (CT + LP) composite strengthening process and properties of GCr15-bearing steel were studied in this paper. The microstructure, residual stress distribution and nanoindentation properties of GCr15-bearing steel under CT + LP composite strengthening were studied by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray stress analyzer and nanoindentation instrument. The experimental results showed that the residual compressive stress value and FWHM (full width at half maximum) value of the surface of GCr15-bearing steel increased after CT + LP composite strengthening, and the microstructure characteristics such as dislocation entanglement, proliferation, subgrain boundary and nanocrystalline appeared inside the CT + LP specimen. The nano-hardness and elastic modulus of CT + LP sample were 6.55 and 221.95 GPa, respectively, which were 12.94% and 32.61% higher than that of the untreated sample, respectively. The nanoindentation properties and deformation resistance of GCr15-bearing steel were improved.
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