焊缝填充量对15Cr2Mo1耐热钢焊接修复性能的影响  

Influence of weld filling amount on repair welding performance of 15Cr2Mo1 heat resistant steel

作　　者：晏嘉陵 齐彦昌[3] 刘明星 常子金 吴赵波 崔冰[3,4] Yan Jialing;Qi Yanchang;Liu Mingxing;Chang Zijin;Wu Zhaobo;Cui Bing(China Datang Corporation Science and Technology General Research Institute Co.,Ltd.,East China Electric Power Test&Research Institute,Hefei 230088,China;Datang Boiler and Pressure Vessel Inspection Center,Hefei 230088;Welding Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Anhui University of Technology,Maanshan 243032,Anhui,China)

机构地区：[1]中国大唐集团科学技术研究总院有限公司华东电力试验研究院,合肥230088 [2]大唐锅炉压力容器检验中心有限公司,合肥230088 [3]钢铁研究总院焊接研究所,北京100081 [4]安徽工业大学,安徽马鞍山243000

出　　处：《焊接》2024年第9期56-61,共6页Welding & Joining

摘　　要：【目的】15Cr2Mo1钢属于珠光体耐热钢,在电力和石化等领域应用广泛。但是在长期的使用过程中经常会出现某些区域的裂纹等问题。而补焊工艺具有操作难度不高、代价低和复原能力好等优点。该文旨在揭示焊接修补填充量对焊接接头性能的影响。【方法】采用镍基合金焊条对15Cr2Mo1耐热钢进行不同结构类型和不同坡口类型的补焊试验。【结果】研究结果表明,坡口深度为6.5 mm,13 mm和19.5 mm时,补焊接头的补焊区各焊道布置合理且接头各区域均不存在明显缺陷;3种填充量下的补焊区焊缝组织均为奥氏体组织,晶内析出物呈颗粒状;在原始焊缝区和补焊区之间的熔合区发现有宽度约为15μm过渡层,线扫结果表明,大量奥氏体化元素Ni,Cr,Mn进入该区域,使得该区域的淬硬倾向增加。【结论】3种填充量下的补焊接头均能保持较好的强韧匹配。[Objective]15Cr2Mo1 steel is pearlitic heat-resistant steel,which is widely used in electric power and petrochemical fields.However,problems such as cracks in some areas often occur during long-term use.Repair welding process has advantages of low operation difficulty,low cost and good resilience.The aim of this paper was to reveal effect of filling amount of repair welding on properties of welded joints.[Methods]Repair welding tests of 15Cr2Mo1 heat-resistant steel with different structure types and different groove types were carried out.[Results]The results showed that when grooves depth were 6.5 mm,13 mm and 19.5 mm,each weld pass of repair welded joints were arranged reasonably and there were no obvious defects in each zone of welded joints.Under three kinds of filling amount,microstructure of weld in repair welded zone was austenite,and precipitates in grains were granular.A transition layer in fusion zone between original weld zone and repair welding zone was found with a width of about 15μm.Line scanning results showed that a large number of austenitic elements Ni,Cr and Mn entered the zone,which increased hardening tendency of the zone.[Conclusion]Repair welded joints under three filling amount could maintain a good match of strength and toughness.

关 键 词：15Cr2Mo1耐热钢 补焊 填充量 ENiCrFe-3 

分 类 号：TG442[金属学及工艺—焊接]