文献类型：期刊文献

英文题名：Application of indentation test on strength characterization of the dissimilar metal welded joint

作者：Chen, Guoyao[1];Zheng, Xiaotao[1];Zhong, Jiru[2];Guan, Kaishu[2]

机构：[1]Wuhan Inst Technol, Hubei Prov Key Lab Chem Equipment Intensificat & I, Wuhan 430205, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：222

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;EI(收录号：20260620012270);WOS:【SCI-EXPANDED(收录号:WOS:001684148700001)】；

基金：The authors are grateful for the supports provided by the National MCF Energy R & D Program of China (2022YFE03120000) and the Na-tional Natural Science Foundation of China (52275159) .

语种：英文

外文关键词：Indentation tests; Dissimilar metal welded joint; Strength mismatch; Local strength properties

摘要：Dissimilar metal welded joints (DMWJs) present challenges in strength characterization due to their heterogeneous microstructures and complex interfaces. Traditional miniature tensile tests face limitations in evaluating local mechanical properties, especially for in-service components. This study explored the application of indentation testing as a non-destructive, localized method for assessing strengths distribution across nickel-based alloy 52M weld joint used in nuclear reactors. The microstructural analysis was conducted using optical microscopy and electron backscatter diffraction. Indentation tests incorporated with database method were subsequently employed to determine local strength properties. The results indicated that variable local strengths were observed across the DMWJ, especially in the interface regions. The 52 Mb and 52Mw weld metals show comparable strength and are well-matched to the base metal, whereas significant strength mismatch occurred at the A508/52 Mb interface. The yield strength ratio (defined as the local yield strength normalized by that of the A508 base metal) reaches 1.6, which may increase the risk of crack nucleation and propagation in the A508/52 Mb interface. The local strength distribution obtained by indentation testing offers valuable insights for structural integrity assessments of DMWJs in nuclear applications.