奥氏体不锈钢焊条焊缝金属低温韧性试验  

Weld Metal Low-temperature Toughness Test for A ustenitic Stainless Steel Electrode

作　　者：段莉蕾 李志杰 高永光 谷松伟 蔡景瑞 Duan Lilei;Li Zhjie;Gao Yongguang;Gu Songwei;Cai Jingrui(Technology Center,CFHI Dalian Nuclear Power Petrochemical Co.,Ltd.,Dalian 116113,China)

机构地区：[1]一重集团大连核电石化有限公司技术中心,辽宁大连116113

出　　处：《压力容器》2020年第11期8-14,共7页Pressure Vessel Technology

摘　　要：采用奥氏体不锈钢焊条手工电弧焊方法进行焊缝金属-196℃冲击韧性试验,详细研究了焊缝金属化学成分、组织、纯净度、焊后热处理对低温冲击韧性的影响。通过化学成分控制,降低焊缝金属中的铁素体含量能够显著提高低温冲击韧性,纯奥氏体不锈钢焊条表现出优越的低温韧性,超低C焊条低温韧性将进一步提高。降低焊缝金属中的H,O等杂质元素含量,有利于低温韧性的提高。焊后热处理后,低温韧性有一定程度的降低。通过试验研究,为低温奥氏体不锈钢焊接的选材、工艺设计等提供了参考依据。The weld metal impact toughness test of SMAW welding at-196℃ was carried out using austenitic stainless steel electrode.The influence of weld metal chemical composition,microstructure,purity and postweld heat treatment on low temperature impact toughness was studied in detail.By chemical composition control and reducing ferrite content in the weld metal,the low-temperature impact toughness can be significantly improved,pure austenitic stainless steel electrode shows excellent low-temperature toughness,and the low-temperature toughness of ultra-low C electrode will be further improved.Reducing the amount of impurity elements in the weld metal such as H and O is beneficial to the improvement of low-temperature toughness.After postweld heat treatment,the low-temperature impact toughness of the weld metal decreases to a certain extent.The experimental study provides a reference for material selection and process design of low-temperature austenitic stainless steel welding.

关 键 词：-196℃低温韧性 铁素体 奥氏体不锈钢焊条 

分 类 号：TH140.7[一般工业技术—材料科学与工程] TG115.6[机械工程—机械制造及自动化]