Effect of Acicular Ferrite on Cracking Sensibility in the Weld Metal of Q690+Q550 High Strength Steels
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概要
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High strength steels Q690+Q550 were welded using three different welding wires without preheating by gas shielded arc welding process. Microstructural characteristics of weld metals and nucleation mechanism of acicular ferrite were investigated by means of scanning electron microscope (SEM), energy dispersive spectrum (EDS) and transmission electron microscope (TEM). The straight Y-groove test and impact test were employed to assess cracking resistance and impact toughness of joints. Results indicated that the addition of Ti and Cr in the MK·G60-1 weld metal suppressed the formation of pro-eutectoid ferrite and ferrite side plate and contributed to the formation of acicular ferrite. The inclusions composed of (Ti, Mn) oxides and Mn, Cu sulfides became nucleation sites of primary acicular ferrite. Secondary acicular ferrites were nucleated on some pre-existing ferrite laths. Impact toughness and cracking resistance were enhanced with the increase of acicular ferrite in the weld metal.
- 2011-07-15
著者
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Zhang Lei
Key Laboratory For Liquid-solid Structural Evolution And Processing Of Materials Ministry Of Educati
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Li Yajiang
Key Laboratory For Liquid-solid Structural Evolution And Processing Of Materials Ministry Of Educati
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Jiang Qinglei
Key Laboratory For Liquid-solid Structural Evolution And Processing Of Materials Ministry Of Educati
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Wang Juan
Key Laboratory For Liquid-solid Structural Evolution And Processing Of Materials Ministry Of Educati
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WANG Juang
Key Lab for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University
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ZHANG Lei
Key Lab of Display Science and Technology of Sichuan Province, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC)
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