TY - JOUR
T1 - Fatigue life extension of 42CrMo high-strength steel and its micro strengthening mechanism under laser shock peening
AU - Sun, Rujian
AU - Huang, Weiqing
AU - Cao, Ziwen
AU - Che, Zhigang
AU - Zou, Shikun
AU - Wu, Junfeng
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - Laser shock peening is an advanced surface treatment technique in improving the fatigue properties of metallic components. In this study, the effects of different laser shock peening regions on the high cycle fatigue of 42CrMo high-strength steel were investigated. Surface deformation, residual stress, and microhardness were analyzed, and microstructural evolution including grain size, boundary distribution, and misorientation was examined. Results show that peening the specimen with both surfaces and sides resulted in a better fatigue life than only peening the surface. The compressive residual stress introduced in both the surfaces and sides provided a higher resistance for fatigue initiation. In addition, the increase of low angle grain boundary accounted for the micro strengthening mechanism for the fatigue life extension.
AB - Laser shock peening is an advanced surface treatment technique in improving the fatigue properties of metallic components. In this study, the effects of different laser shock peening regions on the high cycle fatigue of 42CrMo high-strength steel were investigated. Surface deformation, residual stress, and microhardness were analyzed, and microstructural evolution including grain size, boundary distribution, and misorientation was examined. Results show that peening the specimen with both surfaces and sides resulted in a better fatigue life than only peening the surface. The compressive residual stress introduced in both the surfaces and sides provided a higher resistance for fatigue initiation. In addition, the increase of low angle grain boundary accounted for the micro strengthening mechanism for the fatigue life extension.
UR - http://www.scopus.com/inward/record.url?scp=85090497821&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/892/1/012005
DO - 10.1088/1757-899X/892/1/012005
M3 - Conference article
AN - SCOPUS:85090497821
SN - 1757-8981
VL - 892
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012005
T2 - 3rd International Workshop on Materials Science and Mechanical Engineering, IWMSME 2020
Y2 - 18 April 2020 through 20 April 2020
ER -
