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Effects of tensile elastic pre-deformation at different strain rates on the high-cycle fatigue behavior of SAE 1050 steel and fatigue life prediction

Published online by Cambridge University Press:  30 August 2016

Zhenyu Zhu ,
Guangze Dai ,
Junwen Zhao ,
Hechuan Zhang ,
Lei Xu  and
Qingsong Zhang
Zhenyu Zhu
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China
Guangze Dai*
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China
Junwen Zhao
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China
Hechuan Zhang
Affiliation:
First Geological Environment Survey Institute of Bureau of Geological and Mineral Resource Prospecting & Development of Henan Province, Zhengzhou, Henan 450001, People's Republic of China
Lei Xu
Affiliation:
School of Materials Science and Engineering, Xihua University, Chengdu, Sichuan 610039, People's Republic of China
Qingsong Zhang
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A series of characterization tests were performed to elucidate the high-cycle fatigue (HCF) behavior in SAE 1050 steel subjected to tensile elastic pre-deformation at different strain rates. In the pre-strained stage, the deformation was maintained constant at 0.16%, which was close to the low yield point at strain rates ranging from 10−5 s−1 to 10−2 s−1. Although pre-deformation occurred entirely in the elastic regime, using different pre-straining rates resulted in the occurrence of heterogeneous microscopic strain at different sites and locations during subsequent fatigue tests. It was found that the effect of pre-straining rate on crack initiation and crack propagation was not monotonous and was influenced by the homogeneity of deformation within grain boundaries, the integrity of the boundary structure, and the fracture toughness. In addition, the rough set theory model was introduced for the attribute reduction of characteristic parameters and provided a scientific basis to establish the fatigue model. The model was able to effectively predict the lifetime of the process of HCF in pre-strained steel. Hence, the pre-straining rate should be an important boundary condition in further studies.

Keywords

pre-straining ratehigh-cycle fatiguemicroscopic plastic strainrough setsfatigue model
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 18: Focus Section: Reinventing Boron Chemistry for the 21st Century , 28 September 2016 , pp. 2825 - 2837
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Copyright
Copyright © Materials Research Society 2016 

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