CAJ | 학술논문

　　针对国产9Ni钢，对其进行焊接及热处理工艺制定。采用多层多道手工电弧焊，焊条为ENiCrMo-3，焊前不预热且严格控制层间温度；选择双相区处理工艺。通过高低温拉伸试验、低温冲击试验、硬度测试及金相组织观察检测焊接接头性能。结果表明，9Ni钢接头低温冲击韧性和抗拉强度均满足要求，对其制定的焊接和热处理工艺切实可行。
　　침대국산9Ni강，대기진행한접급열처리공예제정。채용다층다도수공전호한，한조위ENiCrMo-3，한전불예열차엄격공제층간온도；선택쌍상구처리공예。통과고저온랍신시험、저온충격시험、경도측시급금상조직관찰검측한접접두성능。결과표명，9Ni강접두저온충격인성화항랍강도균만족요구，대기제정적한접화열처리공예절실가행。
The welding and heat treatment process of the 9% Ni steel were investigated. SMAW was employed as the joining technique and ENiCrMo?3 as the welding material. Multi?pass welding and low inter?pass temperature were also applied as well as the QLT(quenching+intercritical quenching+tempering)heat treatment process. The welded joints were investigated by high and low temperature tensile test,low temperature impact test,hardness test and optical microscope. The results show that the impact toughness and tensile strength meet the requirement,which proves that the welding and heat treatment process are feasible and practical.