16MND5/309L/308L/Z2CND18-12N异种金属焊接件的组织和性能
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摘要
对国内按照法国核电技术制造的16MND5/309L/308L/Z2CND18-12N异种金属焊接件的化学成分、显微组织及力学性能进行了测试分析。结果表明:焊接件各部分的化学成分均符合相关标准技术要求,16MND5/309L界面附近的化学成分存在显著变化;母材16MND5低合金钢和Z2CND18-12N不锈钢的显微组织分别为上贝氏体和等轴奥氏体,309L和308L不锈钢焊缝的显微组织主要为枝晶状奥氏体,其上分布着少量δ-铁素体,16MND5/309L界面区域形成了马氏体薄层;焊接件的硬度存在不均匀性,16MND5/309L界面区域的硬度最高。最后分析讨论了异种金属焊接件界面区的碳迁移和其他性能。
The chemical compositions,microstructure and mechanical properties of 16MND5/309L/308L/Z2CND18-12Ndissimilar metal weld(DMW)which was manufactured with French nuclear power technologies were analyzed.The results indicate that the chemical compositions of main parts of the DMW met the requirements of relevant standards and there was a significant change across 16MND5/309Linterface.The microstructures of16MND5and Z2CND18-12Nsteel were upper-bainite and equiaxed austenite respectively.The microstructures of309Land 308Lweld were dendritic austenite with a littleδ-ferrite.The 16MND5/309Linterface had a thin layer of martensite.The hardness distribution across the DMW was not homogenious and the 16MND5/309Linterface exhibited the highest hardness.Carbon migration and other properties of the DMW were also discussed.
The chemical compositions,microstructure and mechanical properties of 16MND5/309L/308L/Z2CND18-12Ndissimilar metal weld(DMW)which was manufactured with French nuclear power technologies were analyzed.The results indicate that the chemical compositions of main parts of the DMW met the requirements of relevant standards and there was a significant change across 16MND5/309Linterface.The microstructures of16MND5and Z2CND18-12Nsteel were upper-bainite and equiaxed austenite respectively.The microstructures of309Land 308Lweld were dendritic austenite with a littleδ-ferrite.The 16MND5/309Linterface had a thin layer of martensite.The hardness distribution across the DMW was not homogenious and the 16MND5/309Linterface exhibited the highest hardness.Carbon migration and other properties of the DMW were also discussed.
引文
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[11]AFCEN RCC-M M3301-2000 Class 1,2and 3austenitic stainless steel forgings and drop forgings[S].
[12]AFCEN RCC-M M2114-2000 Manganese-nickelmolybdenum alloy steel forgings for pressurized water nuclear reactor vessel nozzles[S].
[13]AWS Specification A5.9-1993 Specification for bare stainless steel welding electrodes and rods[S].
[14]李淼升,于淏.低合金钢与奥氏体不锈钢堆焊层的焊接工艺[J].机械制造文摘:焊接分册,2012(1):32-35.
[15]崔勇,秦华,胡传顺,等.13MnNiMoNbR与00Cr19Ni10异种钢焊接接头的组织与性能[J].理化检验-物理分册,2011,47(10):605-611.
[16]杨敏,李长香,罗英,等.核岛主设备接管与安全端对接焊缝焊接材料选择对焊缝质量的影响[C]//第十五次全国焊接学术会议论文集,2010.
[2]李光福,杨武.核电站异材焊接件的破裂问题与应力腐蚀评价方法[J].核安全,2003(2):37-40.
[3]李光福.压水堆压力容器接管-主管安全端焊接件在高温水中失效案例和相关研究[J].核技术,2013,36(4):1-6.
[4]ANDRESEN P,MORRA M,AHLUWALIA A,et al.PWSCC of alloys 690,152and 52[C]//Proceedings of Thirteenth International Conference on Environmental Degradation of Materials in Nuclear Power SystemsWater Reactors.Canada:Canadian Nuclear Society,2007:CD-ROM.
[5]ALEXANDREANU B,YANG Y,CHEN Y,et al.The stress corrosion cracking behavior of alloys 690and152weld in a PWR environment[C]//Proceedings of Fourteenth International Conference on Environmental Degradation of Materials in Nuclear Power SystemsWater Reactors.USA:American Nuclear Society,2009:CD-ROM.
[6]李光福,李冠军,方可伟,等.异材焊接件A508/52M/316L在高温水环境中的应力腐蚀破裂[J].金属学报,2011,47(7):797-803.
[7]王光辉,彭君,袁义帆,等.硫酸根离子和电极电位对异材焊接件A508/52M在高温水中应力腐蚀破裂的影响[J].理化检验-物理分册,2013,49(6):357-366.
[8]LI G F,CONGLETON J.Stress corrosion cracking of a low alloy steel to stainless steel transition weld in PWR primary waters at 292[J].Corrosion Science,2000,42:1005-1021.
[9]LI G F,CHARLES E A,CONGLETON J.Effect of post weld heat treatment on stress corrosion cracking of a low alloy steel to stainless steel transition weld[J].Corrosion Science,2001,43(10):1963-1983.
[10]LAUKKANEN A,NEVASMAA P,EHRNST'EN U,et al.Characteristics relevant to ductile failure of bimetallic welds and evaluation of transferability of fracture properties[J].Nuclear Engineering and Design,2007,237:1-15.
[11]AFCEN RCC-M M3301-2000 Class 1,2and 3austenitic stainless steel forgings and drop forgings[S].
[12]AFCEN RCC-M M2114-2000 Manganese-nickelmolybdenum alloy steel forgings for pressurized water nuclear reactor vessel nozzles[S].
[13]AWS Specification A5.9-1993 Specification for bare stainless steel welding electrodes and rods[S].
[14]李淼升,于淏.低合金钢与奥氏体不锈钢堆焊层的焊接工艺[J].机械制造文摘:焊接分册,2012(1):32-35.
[15]崔勇,秦华,胡传顺,等.13MnNiMoNbR与00Cr19Ni10异种钢焊接接头的组织与性能[J].理化检验-物理分册,2011,47(10):605-611.
[16]杨敏,李长香,罗英,等.核岛主设备接管与安全端对接焊缝焊接材料选择对焊缝质量的影响[C]//第十五次全国焊接学术会议论文集,2010.