Mn含量对Inconel718板材焊接接头组织性能的影响  

Effect of Mn Content on Microstructure and Properties of Inconel718 Plate Welded Joint

作　　者：杨亚倩 马帅 王惠生 杨晓东 梁田[1,2] 马颖澈[1,2] Yang Yaqian;Ma Shuai;Wang Huisheng;Yang Xiaodong;Liang Tian;Ma Yingche(Institute of Metal Research,Chinese Academy of Sciences,Shichang Xu Advanced Material Innovation Center,Shenyang 110016,China;Chinese Academy of Sciences,Key Laboratory of Nuclear Materials and Safety Evaluation,Shenyang 110016,China;CGN Uranium Development Co.,LTD.,CGN Advanced Fuel Development Center,Yangjiang 529500,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学院核用材料与安全评价重点实验室,沈阳110016 [3]中广核铀业发展有限公司中广核先进燃料研制中心,阳江529500

出　　处：《特殊钢》2024年第3期96-104,共9页Special Steel

摘　　要：采用w[Mn]<0.01%、0.24%、0.34%三种不同合金的固溶态Inconel718热轧板材进行直流脉冲电弧焊接,经双级热时效处理后进行室温拉伸实验,研究Mn含量的变化对焊接接头微观组织及时效态力学性能影响规律。结果表明,三种不同Mn含量焊接接头组织中只存在Laves相,没有δ相析出,随着w[Mn]由<0.01%提高至0.34%,焊接接头中Laves相析出体积分数略有增多。经过双级热时效处理后,γ’’开始析出,焊接接头组织中Laves相含量略有减少。与时效态母材拉伸性能相比,焊接接头拉伸强度和伸长率有所降低。且随着Mn含量的增加,时效态焊接接头拉伸性能略有降低,抗拉强度由1250 MPa小幅降低至1178 MPa和1213 MPa,三种不同Mn含量的焊接接头时效态拉伸样品断裂位置皆为焊缝区域,且均为韧性断裂。The service performance of welded parts is directly impacted by the microstructure of the Inconel718 welded joint;however,there is a lack of comprehensive research on the impact of the Mn element on the microstructure and performance of the welded junction.In this study,the solid-solution Inconel718 hot-rolled plates with varied Mn concentrations of<0.01%,0.24%,and 0.34%were joined by using DC pulse arc welding before two stages of thermal aging.The tensile test of these plates was performed at room temperature to determine the impact of Mn content on the microstructure and aging mechanical properties of welded joints.The results demonstrate that there are only the Laves phase and noδphase in the welded joints with three different Mn concentrations.The volume proportion of Laves phase precipitates in the welded joints significantly increases as the Mn content rises from<0.01%to 0.34%.However,the content of Laves phases decreases slightly,andγ''begins to precipitate after a two-stage thermal aging treatment.In addition,the tensile strength and elongation of the welded joint are inferior to those of the aged base metal.The tensile properties of the aged welded joints are worsened by the increase in Mn content,causing a decrease in tensile strength from 1250 MPa to 1178MPa and 1213 MPa,respectively.The three welded joints are broken at the welded areas in the tensile test,all of which are ductile fractures.

关 键 词：INCONEL718合金 MN含量 LAVES相 焊接性能 板材 

分 类 号：TG406[金属学及工艺—焊接]