Effect of Cooling Rate on Microstructures and Properties of Welding Heat Affected Zones in X80 Pipeline Steel
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摘要: 通过热模拟的方法研究了冷却速度对X80管线钢焊接热影响区组织性能的影响。采用光学显微镜和力学性能测试技术对X80管线钢热模拟后试样的组织和性能进行分析。结果表明：X80管线钢经历热循环后的主要组织为贝氏体和铁素体。随着冷却速度的增大，贝氏体为粒状贝氏体和板条贝氏体，铁素体为多边形铁素体和针状铁素体。当冷却速度超过50℃/s时，组织中出现了针状马氏体；与母材相比，不同冷却速度下的X80管线钢焊接热影响区粗晶区的硬度没有出现明显的下降。Abstract: 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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Key words:
- X80 pipeline steel /
- cooling rate /
- toughness /
- welding heat affected zone
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