热影响区组织对12Cr1MoVG再热裂纹敏感性的影响
Influence of heat affected zone microstructure of 12Cr1MoVG reheat cracking susceptibility
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摘要: 采用Gleeble热力模拟机分别对铁素体+珠光体组织、贝氏体组织的两种12Cr1MoVG钢进行焊接热影响区(HAZ)热模拟试验,并对模拟组织进行高温慢拉伸试验,研究两种热影响区组织的再热裂纹敏感性. 试验结果表明,HAZ组织为铁素体+贝氏体时,再热裂纹温度区间为640~760 ℃,最敏感温度点为690 ℃;HAZ组织是贝氏体时,在650 ℃后,尤其在690 ℃,再热裂纹倾向比较明显. 分析结果表明,贝氏体HAZ组织再热裂纹敏感性高,而5%~8%铁素体的存在能够降低再热裂纹敏感性.Abstract: The heat affected zone (HAZ) simulation test was done on two sorts of 12Cr1MoVG specimen. One of which was ferrite and pearlite for base metal and bainite for the other, by using Gleeble Thermal-force simulation machine. Then, for studying the reheat cracking susceptibility in the two different weld structures, the tensile test was done on the two different HAZ structures at different high temperatures slowly. The result showed that when HAZ structure is ferrite and bainite,its reheat cracking sensitive temperature range is 640-760 ℃ and the most sensitive point is 690 ℃ in our study. When HAZ structure is bainite,reheat cracking tendency is obvious after 650 ℃, especially at 690 ℃.Analysis result showed that when bainite exists in HAZ,its reheat cracking susceptibility is high. However, 5% to 8% ferrite exists in HAZ can reduce the reheat cracking sensitivity.
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Keywords:
- reheat cracking /
- heat affected zone simulation test /
- bainite /
- ferrite
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