CAJ | 학술논문

对壁厚(10+2)mm 的 L450/316L 复合管进行了对焊试验，打底焊及过渡焊采用管内外充氩保护的GTAW焊，填充及盖面焊采用手工电弧焊，并对其焊接接头进行拉伸、刻槽锤断、弯曲、冲击、晶间腐蚀试验评价对焊焊缝的性能，采用光学、扫描电镜（SEM）及能谱分析（EDS）对焊接接头的冲击断口、显微组织及合金元素的进行扩散分析。试验结果表明：接头力学性能良好，耐晶间腐蚀性能较好；焊缝不锈钢层主要有奥氏体、铁素体组成；过渡层组织较细小，可以防止不锈钢层金属中合金元素被扩散层稀释；扩散层组织主要为马氏体、少量的残余奥氏体；合金钢层组织为先共析铁素体、针状铁素体、粒状贝氏体和及少量珠光体。
대벽후(10+2)mm 적 L450/316L 복합관진행료대한시험，타저한급과도한채용관내외충아보호적GTAW한，전충급개면한채용수공전호한，병대기한접접두진행랍신、각조추단、만곡、충격、정간부식시험평개대한한봉적성능，채용광학、소묘전경（SEM）급능보분석（EDS）대한접접두적충격단구、현미조직급합금원소적진행확산분석。시험결과표명：접두역학성능량호，내정간부식성능교호；한봉불수강층주요유오씨체、철소체조성；과도층조직교세소，가이방지불수강층금속중합금원소피확산층희석；확산층조직주요위마씨체、소량적잔여오씨체；합금강층조직위선공석철소체、침상철소체、립상패씨체화급소량주광체。
The L450/316L clad pipe with thickness of (10+2)mm was welded by birth welding. GTAW welding with argon shielding on the back of the metal was used to weld transition layer and clad material, and shielded metal arc welding was used to weld base material. The tensile strength, nick-break test, bending strength, impact and intergranular corrosion test were carried out to study properties of the girth joint. The microstructure and diffusion of impact fracture and the major alloying elements were analyzed by optical microscopy, SEM and chemical analysis. The results show that the properties of the welded joint of girth joint accord with relevant standards and the girth joint can resist intergranular corrosion. Stainless steel weld layer mainly contains austenitic and ferrite;the microstructure of transition layer is smaller, which can prevent the stainless steel alloy element from being diluted by the diffusion layer;diffusion layer mainly contains martensite, a small amount of residual austenite ; alloy layer organization contains eutectoid ferrite, acicular ferrite , granular bainite and pearlite .