Guo Lin, Huo Xiangdong, Li Liejun, Li Jianfeng, Dong Feng, Tian Zhenzhuo. Effect of Cooling Rate on Microstructures and Properties of Welding Heat Affected Zones in X80 Pipeline Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(6): 96-100. doi: 10.7513/j.issn.1004-7638.2013.06.019
Citation:
Guo Lin, Huo Xiangdong, Li Liejun, Li Jianfeng, Dong Feng, Tian Zhenzhuo. Effect of Cooling Rate on Microstructures and Properties of Welding Heat Affected Zones in X80 Pipeline Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(6): 96-100. doi: 10.7513/j.issn.1004-7638.2013.06.019
Guo Lin, Huo Xiangdong, Li Liejun, Li Jianfeng, Dong Feng, Tian Zhenzhuo. Effect of Cooling Rate on Microstructures and Properties of Welding Heat Affected Zones in X80 Pipeline Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(6): 96-100. doi: 10.7513/j.issn.1004-7638.2013.06.019
Citation:
Guo Lin, Huo Xiangdong, Li Liejun, Li Jianfeng, Dong Feng, Tian Zhenzhuo. Effect of Cooling Rate on Microstructures and Properties of Welding Heat Affected Zones in X80 Pipeline Steel[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(6): 96-100. doi: 10.7513/j.issn.1004-7638.2013.06.019
The effects of cooling rate on microstructures and mechanical properties of welding heat affected zones in X80 pipeline steel were studied by thermal simulation test. After thermal simulation,the microstructures of X80 pipeline steel were observed by optical microscope,and the mechanical properties were tested with mechanical property testing technologies. The results show that the microstructures of X80 pipeline steel after thermal cycle are bainite and ferrite. With the increase of cooling rate,the bainite turns to granular and lath shape,and the ferrite to polygon and acicular shape. Acicular martensite appears as the cooling rate exceeds 50℃/s. The hardness of coarse grain area on welding heat affected zone does not show any significant decrease under different cooling rate.
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