12Cr1MoVG厚壁管多次模拟焊后热处理后性能评估
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摘要
对大口径厚壁管12Cr1MoVG进行多次模拟焊后热处理,并使用力学性能检测设备、光学显微镜、扫描电子显微镜对样品进行分析,旨在研究多次热处理对钢管性能均匀性及组织稳定性的影响。结果表明:经3次回火热处理之后,强度、硬度稍有下降,冲击韧性指标稳定,金相组织稳定性较好,即只要过程控制得当,经多次热处理之后大口径厚壁管12Cr1MoVG性能均匀性及组织稳定性仍较好;强度与球化级别的关系并不完全符合DL/T773标准。该试验弥补了现场热处理未能破坏取样的不足,为锅炉管道对口安装及返修热处理的评估提供重要的数据支撑。
In this paper,the large-diameter thick-wall pipe 12 Cr1 MoVG was subjected to multiple simulated post-weld heat treatments to study the effects of multiple heat treatments on the performance uniformity and microstructure stability of steel tubes by means of mechanical properties testing equipments,optical microscope(OM),scanning electron microscopy(SEM). The results show that after three times of tempering heat treatment,the strength and hardness are slightly decreased,the impact toughness index is stable,and the stability of metallographic structure is good,that is,as long as the process is properly controlled,the performance uniformity and microstructure stability of the large-diameter thick-wall pipe 12 Cr1 MoVG after multiple heat treatments are still good;the relationship between intensity and sphe-roidization level is not completely consistent with the DL/T773 standard. The test compensated for the insufficiency of on-site heat treatment to destroy the sampling,and provided important data support for the evaluation of boiler pipe counterpart installation and rework heat treatment.
In this paper,the large-diameter thick-wall pipe 12 Cr1 MoVG was subjected to multiple simulated post-weld heat treatments to study the effects of multiple heat treatments on the performance uniformity and microstructure stability of steel tubes by means of mechanical properties testing equipments,optical microscope(OM),scanning electron microscopy(SEM). The results show that after three times of tempering heat treatment,the strength and hardness are slightly decreased,the impact toughness index is stable,and the stability of metallographic structure is good,that is,as long as the process is properly controlled,the performance uniformity and microstructure stability of the large-diameter thick-wall pipe 12 Cr1 MoVG after multiple heat treatments are still good;the relationship between intensity and sphe-roidization level is not completely consistent with the DL/T773 standard. The test compensated for the insufficiency of on-site heat treatment to destroy the sampling,and provided important data support for the evaluation of boiler pipe counterpart installation and rework heat treatment.
引文
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[2]郭元蓉,吴红,陈雨,等.厚壁12Cr1MoVG钢管的热处理工艺优化[J].钢管,2008,37(5):15.
[3]陈秋龙,杨安静,邹风鸣,等. 12Cr1MoV钢中的粒状贝氏体组织与高温性能[J].金属热处理学报,1996,17(S1):84.
[4]方鸿生,白秉哲,邓海金,等.粒状贝氏体组织形态、精细结构及相变[J].金属热处理学报,1982,3(2):76.
[5]徐洲,赵连成.金属固态相变原理[M].北京:科学出版社,2004.
[6]张而耕,刘桂玲,王志文. 12Cr1MoV高温组织转变及其判废标准探讨[J].石油化工腐蚀与防护,2010,27(1):29.
[7]杨峰,于庆波. 12Cr1MoV钢高温运行过程中组织和性能的研究[J].材料热处理技术,2009,38(20):28.
[8]张而耕,童遂放,王琼琦,等. 12Cr1MoV珠光体耐热钢长期服役中碳化物的变化及对性能的影响[J].材料热处理技术,2009,33(9):28.
[9]杨瑞成,孟威,陈奎,等. 12Cr1MoV钢高温时效过程的动力学研究[J].材料科学与工艺,2008,16(1):19.
[10]钞晨,杨振国.在役12Cr1MoV钢管材的性能劣化及其损伤机制[J].复旦学报,2003,42(1):1.
[11]潘柏定,潘金平,祝新伟,等. 12Cr1MoVG钢硬度与球化关系研究及其寿命评估[J].材料热处理学报,2012,33(S1):125.