이상 스테인리스 Clad강 육성 용접부의 기계적 성질에 미치는 후열처리의 영향에 관한 연구

A Study on Effect of PWHT on Mechanical Properties of Overlaid Weld Metal in Duplex Stainless Clad Vessel

The duplex stainless clad vessel with 38m & over thickness shall be performed to PWHT based on the ASME code. In this case, it is well-known that precipitators such as carbides and sigma($\sigma$) phase are formed at gram boundary between ferrite and austenite phase. Therefore, a weld test for simulating this situation has been planned and performed by 3309LMo71-1 for barrier layer and E2209Tl-1 for 2nd & over layer and then carried out to investigate the overlaid weld metal. Based on the test results, it could be concluded that PWHT should be carried out after the completion of 1st(barrier) layer and then 2 & over layer should be applied.