SCC fracture location shifting affected by stress-controlled fatigue damage of NiCrMoV steel welded joints

Shuo Weng; Yuhui Huang; Xiaofa Si; Fu-zhen Xuan; Yun Kang

Journal of Materials Research and Technology (Nov 2022)

SCC fracture location shifting affected by stress-controlled fatigue damage of NiCrMoV steel welded joints

Shuo Weng,
Yuhui Huang,
Xiaofa Si,
Fu-zhen Xuan,
Yun Kang

Affiliations

Shuo Weng: School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; Machinery Industry Key Laboratory for Mechanical Strength and Reliability Evaluation of Auto Chassis Components, University of Shanghai for Science and Technology, Shanghai, 200093, China; Shanghai Technology Service Platform of Reliability Evaluation for New Energy Vehicle, Shanghai, 200093, China
Yuhui Huang: School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China; Corresponding author.
Xiaofa Si: School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
Fu-zhen Xuan: School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
Yun Kang: School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

Journal volume & issue: Vol. 21
pp. 1534 – 1553

Abstract

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The influence of stress-controlled fatigue (SCF) damage on the fracture location shifting of welded joints for NiCrMoV steels in the corrosive solution of 3.5wt.% NaCl is systematically investigated by electrochemical measurements, immersion tests, slow strain rate tensile (SSRT) tests, and fractural morphology observations in the present work. The results show that both the yield strength (YS) and the ultimate tensile strength (UTS) of welded joints are increased after the SCF tests. The susceptibility of stress corrosion cracking (SCC) and galvanic corrosion of the SCF damaged welded joints are higher than that of the as-received specimens. In addition, the fracture locations of welded joints after SSRT tests in the corrosive solution are shifted with the degree of SCF damage. Different degrees of fatigue damage are accumulated in the three zones of welded joints during the cyclic deformation, which could change the competitive relation of the most susceptive SCC zone between the fusion zone and the middle of WM.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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