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Materials 2018, 11(8), 1336; https://doi.org/10.3390/ma11081336

Fatigue Crack Growth Behavior of the MIG Welded Joint of 06Cr19Ni10 Stainless Steel

1
Department of Chemical Mechanics Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2
Purdue Polytechnic Institute, Purdue University, West Lafayette, IN 47906, USA
3
Department of Mechanical, Industrial & Aerospace Engineering, Concordia University, Montreal, QC H3G 1M8, Canada
*
Authors to whom correspondence should be addressed.
Received: 19 June 2018 / Revised: 29 July 2018 / Accepted: 30 July 2018 / Published: 2 August 2018
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Abstract

In this paper, the fatigue crack growth behavior of the base metal (BM), the weld metal (WM) and the heat-affected zone (HAZ) in the metal-inert gas (MIG) welded joints of the 06Cr19Ni10 stainless steel are analyzed and studied. Results of the fatigue crack propagation tests show that a new fatigue crack initiates at the crack tip of a pre-existing crack, then propagates perpendicular to the direction of cyclic fatigue loads. This observation indicates that the original mixed-mode crack transforms into the mode I crack. The WM specimen has the largest fatigue crack growth rate, followed by the HAZ specimen and the BM specimen. To illustrate the differences in fatigue crack growth behavior of the three different types of specimens, metallographic structure, fracture morphology and residual stresses of the BM, HAZ and WM are investigated and discussed. The metallographic observations indicate that the mean grain size of the HAZ is relatively larger than that of the BM. The fractographic analysis shows that the WM has the largest fatigue striation width, followed by the HAZ and the BM. It is also found that the depth of dimple in the WM is relatively shallower than the one in the HAZ and BM, implying the poor plasticity behavior of the material. Analysis results of the residual stress analysis demonstrate a high level of tensile residual stress appearance in the WM and HAZ. View Full-Text
Keywords: fatigue crack growth; MIG welded joint; microstructure; residual stress; 06Cr19Ni10 fatigue crack growth; MIG welded joint; microstructure; residual stress; 06Cr19Ni10
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Tang, L.; Qian, C.; Ince, A.; Zheng, J.; Li, H.; Han, Z. Fatigue Crack Growth Behavior of the MIG Welded Joint of 06Cr19Ni10 Stainless Steel. Materials 2018, 11, 1336.

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