Journal
MATERIALS & DESIGN
Volume 147, Issue -, Pages 65-79Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.03.032
Keywords
Weld residual stress; Low-temperature transformation; Transformation-induced plasticity
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Funding
- National Natural Science Foundation of China [51575531]
- Taishan Scholar Construction Funding of Shandong Province [ts201511018]
- Natural Science Foundation for Distinguished Young Scholars of Shandong Province [JQ201417]
- Fundamental Research Funds for the Central Universities [15CX08006A, 17CX05019]
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In this study, the weld residual stresses (RS) in a 25 mm thick ferrite steel plate with newly developed low-temperature transformation (LTT) welding wire were investigated by finite element method and neutron diffraction (ND) measurement. A thermo-elastic-plastic finite element model coupled with solid-state phase transformation (SSPT) was developed to investigate the distribution and formation mechanism of RS, which has been verified by ND measurement. The results demonstrate that the developed LTT alloy can significantly reduce the RS and even generate compressive RS in the weld zone, due to the interrupted cooling shrinkage caused by the LTT. The higher inter-pass temperatures related to the microstructure evolution result in an increased region of compressive stress within the weldment. Moreover, the longitudinal RS in the weld zone gradually changes to tension as the initial temperature of martensitic transformation increases. Notably, the relaxation effect of transformation-induced plasticity on RS and its influence on model accuracy were discussed. (C) 2018 Elsevier Ltd. All rights reserved.
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