高氮钢电弧增材制造工艺及组织性能研究  

Study on Process and Microstructure and Properties of High Nitrogen Steel by Arc Additive Manufacturing

作　　者：闻章鲁 周琦[1] 余进[1] 

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210000

出　　处：《热加工工艺》2017年第23期235-238,共4页Hot Working Technology

摘　　要：研究了焊接电流、焊接速度对TIG电弧增材成形高氮钢直壁体的成形质量以及力学性能的影响。结果表明:焊缝宽度和焊缝高度与焊接速度成反比,与焊接电流成正比;当焊接电流为178 A,焊接速度为0.28 m/min,送丝速度为1.9 m/min时,直壁体成形质量最佳。TIG堆焊成形结构件的显微组织呈自下而上连续生长,且晶粒尺寸自下而上逐渐减小,无气孔、夹杂等宏观缺陷。直壁体结构件的硬度沿堆积方向的变化区间为300~320 HV;结构件沿堆焊方向的室温抗拉强度可达1070 MPa,伸长率为24.5%,强度和塑性指标均接近热轧和铸造性能指标。The effects of welding current and welding speed on the forming quality and mechanical properties of high nitrogen steel straight wall formed by TIG arc additive were studied. The results show that the weld width and weld height are inversely proportional to welding speed but proportional to the welding current. When the welding current is 178 A, the welding speed is 0.28 m/rain and the wire feeding speed is 1.9 m/min, the forming quality of straight wall body is the best. The microstructure of TIG surfacing forming structure continuously grows from bottom to top, and the grain size decreases gradually from bottom to top. There arc no macroscopic defects such as porosity and inclusions. The variation range of the hardness of the structural body along the stacking direction is from 300 HV to 320 HV. The room temperature tensile strength of the structure along the surfacing direction is 1070 MPa and the elongation is 24.5 %. The strength and plasticity indexes are closed to the performance indexes of hot rolling and casting

关 键 词：电弧增材制造 高氮钢 显微组织 力学性能 

分 类 号：TG444.2[金属学及工艺—焊接]