CAJ | 학술논문

观察了氩弧焊S32760双相不锈钢管材焊接接头各区的组织，分析了焊接接头腐蚀的原因，测定了焊接接头奥氏体和铁素体相比例。结果表明，氩弧焊焊后不进行热处理，焊缝和热影响区组织均为奥氏体和铁素体双相组织，存在少量的σ相，焊缝金属的奥氏体组织比例为64%，铁素体比例为36%，母材部分奥氏体比例为52%，铁素体比例在48%。双相不锈钢焊接接头熔合线结合良好，焊缝热影响区宽度较小。焊接接头出现孔蚀的原因与焊后冷却速度过慢、焊缝组织中奥氏体量过多及其组织中析出σ相有关。
관찰료아호한S32760쌍상불수강관재한접접두각구적조직，분석료한접접두부식적원인，측정료한접접두오씨체화철소체상비례。결과표명，아호한한후불진행열처리，한봉화열영향구조직균위오씨체화철소체쌍상조직，존재소량적σ상，한봉금속적오씨체조직비례위64%，철소체비례위36%，모재부분오씨체비례위52%，철소체비례재48%。쌍상불수강한접접두용합선결합량호，한봉열영향구관도교소。한접접두출현공식적원인여한후냉각속도과만、한봉조직중오씨체량과다급기조직중석출σ상유관。
Welded joints microstructure of S32760 super duplex stainless steels pipe was observed and the corrosion cause of welded joint was analyzed, the ferrite and austenite phase ratio was determined. The results showed that without heat treatment after GTAW welding, the microstructure of weld and HAZ both are ferrite and austenite duplex phase microstructure, and a small amount of sigma phase exist. The austenite phase content of weld metal is 64%, ferrite phase is 36%, the austenite phase content of parent metal is 52%, and ferrite phase is 48%. The fusion line combination of duplex stainless steel welded joint is good, and the width of weld heat affected zone is smaller. The reasons for pitting corrosion in welded joints is relevant to too slow cooling rate, austenite content is too much and precipitation sigma phase after welding.