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| Effect of Alloying Agent on the Heat Affected Zone Toughness of 09MnNiDR |
| ZHANG Xi1,2,CHEN Yan-qing1,ZHANG Jun1,GUO Zhan-shan1,ZHANG Nan1,YONG Qi-long2 |
1. Institute of Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China
2. Shougang Research Institute of Technology, Application Technology Dept.,Beijing 100043, China |
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Abstract Through testing the mechanical properties of welding joint, and observing the metallurgical structure and second phase in heat affected zone (HAZ), the influence of Ni, Ti to the impact ductility of 09MnNiDR’s HAZ was discussed, and the impact ductility of 09MnNiDR’s HAZ is obviously improved. The research results indicate that the method that improves the impact ductility of HAZ by increasing Ni content is not effective and uneconomical, however, the method that improves HAZ toughness by increasing the content of micro alloy element Ti from 0.016％ to 0.021%-0.026％ is highly effective. By TEM and Thermo-calc thermodynamic software, the mechanism that Ti improves HAZ toughness is studied. The results indicate that when Ti content is increased, the amount of second is phase increased, its grain size is refined, and the thermal stability of second phase is improved. So the grain size of CGHAZ is refined and the width of CGHAZ is shortened. Finally the toughness of HAZ is improved.
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Received: 18 December 2012
Published: 13 December 2013
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2013, Vol. 48 
