• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2025, Vol. 61 ›› Issue (24): 48-62.doi: 10.3901/JME.2025.24.048

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Research Progress on Toughness Control of Low Carbon Martensitic Stainless Steel Weld Metal

LIU Zishen1,2, CAO Rui1,2   

  1. 1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050;
    2. Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050
  • Received:2025-01-22 Revised:2025-09-28 Published:2026-01-26

Abstract: Low carbon martensitic stainless steel is widely used in water conservancy and hydropower, petrochemical and other fields due to its excellent corrosion resistance and comprehensive mechanical properties. As a common joining method, welding is indispensable in the application of martensitic stainless steel. However, the problem of insufficient toughness of weld metal restricts the further application of martensitic stainless steel. Therefore, improving the toughness of weld metal is of great significance for the application of martensitic stainless steel. Based on the relevant research results in recent years, the influencing factors and toughening mechanisms of martensitic stainless steel were systematically summarized, including retained austenite, reversed austenite, δ ferrite, grain refinement and inclusions. The controlling methods of toughness of martensitic stainless steel weld metal are reviewed, such as alloy element controlling, welding process optimization, weld deoxidation and post-weld heat treatment. At the same time, the abnormal phenomena of impact fracture of martensitic stainless steel weld metal are summarized. Suggestions and prospects for follow-up research are put forward.

Key words: low carbon martensitic stainless steel, weld metal, toughness, grain refinement

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