Effects of heat treatment on mechanical properties and sensitization behavior of materials in dissimilar metal weld. (May 2019)

• Record Type: Journal Article
• Authors: Kim, Ho-Sub; Shin, Jiho; Kong, Byeong Seo; Hong, Sunghoon; Oh, Seungjin; Hong, Jong-Dae; Jang, Changheui; Lee, Sanghoon
• Is Part Of: International journal of pressure vessels and piping. Volume 172(2019)
• Page Start: 17
• Page End: 27
• Publication Date: 2019-05
• Subjects: Heat treatment -- Dissimilar metal weld -- Mechanical property -- Sensitization -- Heat affected zone; Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2019.03.009
• Languages: English
• ISSNs: 0308-0161

Abstract

Abstract: In order to mitigate primary water stress corrosion cracking (PWSCC) of dissimilar metal weld (DMW) in the primary coolant system of pressurized water reactor (PWR), a heat treatment has been considered. However, the heat treatment conditions should be carefully determined to prevent detrimental effect on the materials in the DMW region. In this study, changes in the mechanical property of materials in DMW and degree of sensitization of SS were evaluated for various heat treatment conditions. In addition, material properties variation and sensitization within the heat affected zone (HAZ) were investigated after the application of the heat treatment condition of 600 °C for 10 h, which is considered as the representative heat treatment condition. Based on the test results, it was found that the application of the representative heat treatment condition (600 °C for 10 h) would result in negligible detrimental effect on the mechanical properties of materials in DMW and sensitization of SS. Highlights: Various heat treatment was applied on dissimilar metal welds consist of LAS, SS, and Alloy 182. Heat treatment at 600 °C for 10 h showed little change in mechanical properties of materials in DMW. Oxalic etching tests showed that Sensitization of 316 SS was not significant. Overall, there is negligible detrimental effect on the properties of materials in DMW.