310S不锈钢焊接接头组织及力学性能研究
Performance of Thin Plate 310S Stainless Steel Welded Joints
吴厦 1任璐 2代野 1张立业 3郭健 3詹青青 1刘博 1宋凯强 1闫慧敏 1刘正涛 1付扬帆1
作者信息
- 1. 西南技术工程研究所,重庆 400056
- 2. 国家国防科技工业局经济技术发展中心,北京 100000
- 3. 中国船舶集团渤海造船有限公司,辽宁 葫芦岛 125003
- 折叠
摘要
目的 研究310S不锈钢性能焊接接头组织和力学性能.方法 采用手工钨极氩弧焊焊接 310S不锈钢,获得 HR3C 焊丝焊接接头.对焊接接头进行室温拉伸试验、高温拉伸试验和高温蠕变性能测试.通过金相显微镜、扫描电镜、透射电镜及其附带的能谱仪对接头微观组织和断口形貌进行分析.结果 在焊接接头焊缝金属的晶内,Fe元素和Cr元素变化明显,枝晶边界上Cr元素发生富集.310S不锈钢焊接接头在室温和850℃拉伸条件下,抗拉强度分别为 300、140 MPa.在蠕变温度为 850℃、蠕变应力为 50 MPa条件下,平均蠕变断裂时间为26.7 h.焊接接头经高温蠕变试验后,晶界上形成粗大的富铬相,焊缝内纳米相随机分布于晶界与晶内.结论 310S不锈钢HR3C焊丝接头具有良好的室温力学性能,在850℃下高温拉伸性能、高温蠕变性能良好,焊缝组织内纳米相阻碍了位错运动,提升了接头焊缝组织的高温拉伸性能、高温蠕变性能.
Abstract
The work aims to study the microstructure and mechanical properties of welded joints of thin plate 310S stainless steel.In this paper,manual tungsten inert gas arc welding was applied to weld 310S stainless steel and obtain HR3C welding wire welded joints.Room temperature tensile tests,high temperature tensile tests,and high temperature creep property tests were conducted on the welded joints,and the microstructure and fracture morphology of the joints were analyzed.The changes in Fe and Cr elements within the crystal of the weld metal in the welded joint were significant,and Cr elements were enriched at the dendrite boundary.The tensile strength of 310S stainless steel welded joints at room temperature and 850℃ tensile condi-tions was 300 and 140 MPa respectively;At creep temperature of 850℃ and creep stress of 50 MPa,the average creep fracture time was 26.7 hours.After high-temperature creep testing of welded joints,there were coarse chromium rich phases on the grain boundaries,and nano phases randomly distributed at the grain boundaries and within the grains.The 310S stainless steel HR3C welding wire joint has good room temperature mechanical properties,with good high-temperature tensile and creep properties at 850℃.The nano phase in the weld impedes dislocation movement,improving the high-temperature tensile and creep properties of the joint weld microstructure.
关键词
310S不锈钢/钨极氩弧焊/高温力学性能/高温蠕变/微观组织/纳米相Key words
310S stainless steel/tungsten inert gas arc welding/high temperature mechanical properties/high temperature creep/microstructure/nano phase引用本文复制引用
出版年
2024
NETL
NSTL
万方数据