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| Microstructures and toughness of simulated CGHAZ of vanadium microalloyed steel |
| SHI Zhong-ran1，WANG Rui-zhen2，WANG Qing-feng1,2，SU Hang2，CHAI Feng2，YANG Cai-fu2 |
（1. State Key Laboratory of Metastable Materials Science and Technology， Yanshan University， Qinhuangdao 066004， Hebei， China
2. Department of Engineering Steels， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract Using the Gleele-3800 to simulate the thermal cycling process of coarse grained heat affected zone （CGHAZ）. When the weld heat input was 100 kJ/cm， comparing the CGHAZ microstructure and toughness of V steel， V-N steel， V-Ti steel， V-N-Ti steel， analyzed the vanadium and titanium carbon precipitation. The results show that the order of CGHAZ toughness from high to low is V-N-Ti steel， V-Ti steel， V-N steel and V steel; Adding Ti to V steel can effectively decrease the original austenite size; On one hand， increasing the nitrogen based on the V-Ti steel can promote the （Ti，V）（C，N）/TiN formed which can decrease the austenite size. On the other hand， increasing the nitrogen can promote the V（C， N） formed which can promote the polygonal ferrite formed. The polygonal ferrite can partly remedy the detrimental effect of the free N atoms and improve the CGHAZ toughness.
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Received: 29 July 2014
Published: 13 April 2015
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2015, Vol. 50 
