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

被引：9
作者：
Feng, Aixin [1 ,2 ,3 ]
Liu, Bingjie [1 ,2 ,3 ]
Wei, Yacheng [1 ,2 ,3 ]
Xu, Guoxiu [1 ,2 ,3 ]
Chen, Chunlun [1 ,2 ,3 ]
Pan, Xiaoming [1 ,3 ]
机构：
[1] Wenzhou Univ, Coll Mech & Elect Engn, Wenzhou 325035, Peoples R China
[2] Wenzhou Univ, Ruian Grad Coll, Ruian 325000, Peoples R China
[3] Zhejiang Prov Key Lab Laser Proc Robots Machinery, Key Lab Laser Proc & Testing, Wenzhou 325035, Peoples R China
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2023年 / 129卷 / 03期
关键词：
GCr15-bearing steel; CT plus LP; Microstructure; Residual stress; Nanoindentation properties; MECHANICAL-PROPERTIES; ALLOY; PERFORMANCE; BEHAVIORS;
D O I：
10.1007/s00339-023-06500-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
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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页数：9
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