摘要
为明确10Cr9Mo1VNb钢焊接接头各亚区域在服役过程中的组织及性能演变机理,采用不同热处理工艺和高温加速时效模拟制备了与服役50000 h相匹配的10Cr9Mo1VNb钢焊接接头热影响区各区域的大块状试样。通过金相显微镜、扫描电子显微镜和显微硬度计对热模拟试样和实际焊接接头试样的硬度进行了对比分析。结果表明:800℃正火+755℃回火、850℃正火+755℃回火、950℃正火+755℃回火和1300℃正火+755℃回火可以分别成功模拟制备出10Cr9Mo1VNb钢焊接接头的过回火区、部分相变区、细晶粒区和粗晶粒区的大块试样,且经650℃高温加速时效200 h后,这些大块热模拟试样的硬度与569℃实际服役50000 h的10Cr9Mo1VNb钢焊接接头热影响区各区域具有很好的一致性。
In order to clarify the microstructure and property evolution mechanism of different sub-regions in 10Cr9Mo1VNb steel welded joint during long term service,the bulk samples matched with the sub-regions in 10Cr9Mo1VNb steel welded joint after 50000 h service were prepared by different heat treatment processes and high temperature accelerated aging experiment,and the microstructures and hardness of both the thermal simulation bulk samples and the serviced welded joint were investigated by metallographic microscope,scanning electron microscope and digital microhardness tester.The results show that the bulk samples corresponding to the over-tempered zone,inter-critical zone,fine grain zone,coarse grain zone are successfully prepared by the following normalizing and tempering processes of 800℃/755℃,850℃/755℃,950℃/755℃and 1300℃/755℃,respectively.Moreover,after accelerated aging at 650℃for 200 h,the hardness of these thermal simulated bulk samples is in good agreement with that of the sub-regions in 10Cr9Mo1VNb steel welded joint after service at 569℃for 50000 h.
作者
王建桥
要玉宏
金耀华
冯琳杰
刘福广
张巍
韩天鹏
WANG Jianqiao;YAO Yuhong;JIN Yaohua;FENG Linjie;LIU Fuguang;ZHANG Wei;HAN Tianpeng(School of Materials and Chemical Engineering,Xi'an University of Technology,Xi'an 710021,China;Huaneng Pingliang Power Generation Co.,Ltd.,Pingliang 744000,China;Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710032,China)
出处
《热加工工艺》
北大核心
2025年第11期79-85,共7页
Hot Working Technology
基金
华能集团总部科技项目资助项目(HNKJ21-HF254)。
