摘要
通过焊接热模拟试验研究了钢中Mg含量对焊接热影响区夹杂物及组织的影响。研究结果表明,随着钢中Mg质量分数由0增加至27×10-6再到37×10-6,氧硫化物复合夹杂类型变化为Al_2O_3-Mn S→MgO+Al_2O_3+Ti2O3-Mn S→MgO-Mn S;氧硫化物复合夹杂数量增加、尺寸减小。焊接热影响区组织变化为晶界铁素体+魏氏组织+侧板条铁素体→晶界铁素体+晶内针状铁素体→块状铁素体。利用Mg脱氧工艺生产的钢板经过400 k J/cm大线能量焊接后热影响区的-20℃冲击功都在100 J以上。
Effect of Mg content on the inclusions and microstructure in heat affected zone（HAZ） of steel plate after high heat input welding has been investigated employing welding thermal cycle simulation experiments. The results showed that the chemical constituents of oxysulfide inclusions varied from Al2O3-MnS to MgO ＋ Al2O3＋ Ti2O3-MnS and to MgO-MnS with increasing Mg content in steel from 0 to 27 × 10-6 and then to 37× 10-6. The oxysulfide inclusions were increased in number and decreased in size. The main HAZ microstructure was changed from grain boundary ferrite（GBF） ＋ widmansttten ferrite（WF） ＋ ferrite side plate（FSP） to GBF ＋ IAF and then to PF. After welding thermal cycle simulation with the heat input of 400 kJ/cm, the HAZ impact energy at - 20℃ of specimens with Mg deoxidation reached more than 100 J. Key words., oxide metallurgy; heat affected zone; Mg deoxidation; inclusion; microstructure.
作者
徐龙云
杨健
王睿之
王万林
XU Longyun YANG Jian WANG Ruizhi WANG Wanlin(School of Metallurgy and Environment, Central South University, Changsha 410083, China State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China Steelmaking Research Department, Baosteel Central Research Institute, Shanghai 201900, China)
出处
《炼钢》
CAS
北大核心
2017年第5期19-23,共5页
Steelmaking
