Effects of post-weld heat treatment cycles on microstructure and mechanical properties of electric resistance welded pipe welds |
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| Affiliation: | 1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore;2. Singapore Institute of Technology, Singapore;3. School of Engineering and Information Technology, University of New South Wales Canberra, Australia;1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China;2. State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819, China |
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| Abstract: | Two post-weld heat treatment cycles of one-step normalizing and two-step quenching and tempering have been performed by Gleeble, a thermo-mechanical simulator, to improve the toughness of fine-grained electric resistance welded pipe welds. Comparison was made to API X65 grade steel, which is widely used for pipeline parts. Microstructural evolution was investigated by optical microscopy and transmission electron microscopy. Vickers hardness and Charpy V-notch impact toughness tests were used to evaluate the mechanical properties. While the mechanical properties of one-step normalizing heat treatment satisfied the API specification, the two-step quenching and tempering heat treatments were conditional upon tempering temperature for X65 grade and fine-grained steels. As a result, a one-step normalizing heat treatment was more effective for both steel pipes. |
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