压力容器2024，Vol.41Issue(5)：29-35,7.DOI:10.3969/j.issn.1001-4837.2024.05.004
焊接工艺对LNG储罐用高锰钢焊接接头组织和性能的影响
The effect of welding processes on the microstructure and properties of welded joints of high manganese steel for LNG storage tanks
摘要
Abstract
In order to promote the application of new domestic low-temperature high-manganese steel and corresponding welding consumables in the localization of LNG storage tanks,the effects of three different welding processes,i.e.,gas metal arc welding(GMAW),submerged arc welding(SAW)and shielded metal arc welding(SMAW)on the microstructure and mechanical properties of welded joints of high manganese steel for LNG storage tanks were investigated by scanning electron microscopy,optical microscopy and through tests such as tensile testing,bending test,impact toughness test and microhardness test.The results show that the microstructure of the heat affected zone of the three welding processes is composed of austenite and a small amount of inclusion particles.The grains near the fusion line are coarse and narrow,and the microstructure of the weld seam is columnar crystals.The lowest hardness values are all located at the center of the weld seam,and the fracture positions in the tensile test are all at the weld seam.The tensile strength of three welding processes welded joints is 839.2,863.8,675.2 MPa.The tensile and bending properties can meet the requirements.The-196℃impact energy of submerged arc welding seam is 123,100,83.7 J.The impact fracture surface is ductile fracture.The welding heat input of low-temperature high manganese steel should be strictly controlled so as to ensure welding quality of low-temperature high manganese steel.关键词
LNG储罐/低温高锰钢/焊接工艺/力学性能/显微组织Key words
LNG storage tanks/low temperature high manganese steel/welding process/mechanical properties/microstructure分类
机械制造引用本文复制引用
郭广飞,章小浒,任明皓,房务农,莫德敏,肖辉英..焊接工艺对LNG储罐用高锰钢焊接接头组织和性能的影响[J].压力容器,2024,41(5):29-35,7.基金项目
国家重点研发计划项目(2022YFB4003000) （2022YFB4003000）
安徽省自然科学基金项目(2108085ME146) （2108085ME146）
合肥通用机械研究院有限公司博士基金项目(2020011747) （2020011747）
中国石油化工股份有限公司2024年技术开发项目(324088) （324088）
