From Microstructure to Service Failure: A Review of Corrosion Resistance Testing Methods for Super Duplex Stainless Steel Welded Joints

IF 0.3 Q4 METALLURGY & METALLURGICAL ENGINEERING

Russian Metallurgy (Metally) Pub Date : 2026-10-06 DOI:10.1134/S0036029526600288

Hongjun Yuan, Ye Hong, Wanli Qi

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引用次数: 0

Abstract

Super duplex stainless steel (SDSS) offers excellent corrosion resistance due to its balanced ferrite–austenite microstructure. However, welding disrupts this balance, leading to phase imbalance, secondary phase precipitation, and elemental segregation, which degrade joint performance. This review examines corrosion mechanisms and testing methods for SDSS welded joints from a materials science perspective. It describes the duplex microstructure, analyzes the influence of welding processes on microstructural evolution and corrosion resistance, and systematically reviews testing methods by corrosion type, including critical pitting temperature tests, electrochemical techniques, chemical immersion tests, and slow strain rate tests for pitting, intergranular, stress corrosion cracking, and selective corrosion. Current limitations and future directions are discussed, focusing on in situ monitoring, machine learning-assisted prediction, and multi-scale correlation. This review provides a systematic reference for quality control and corrosion assessment of SDSS welded joints.

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从微观结构到使用失效：超级双相不锈钢焊接接头耐腐蚀试验方法综述

超级双相不锈钢（SDSS）由于其平衡的铁素体-奥氏体组织而具有优异的耐腐蚀性。然而，焊接破坏了这种平衡，导致相不平衡、二次相析出和元素偏析，从而降低了接头的性能。本文从材料科学的角度综述了SDSS焊接接头的腐蚀机理和测试方法。描述了双相组织，分析了焊接工艺对微观组织演变和耐蚀性的影响，系统地回顾了腐蚀类型的测试方法，包括临界点蚀温度测试、电化学技术、化学浸泡测试以及点蚀、晶间、应力腐蚀开裂和选择性腐蚀的慢应变速率测试。讨论了当前的局限性和未来的方向，重点是现场监测，机器学习辅助预测和多尺度相关。为SDSS焊接接头的质量控制和腐蚀评价提供了系统的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

0.70

自引率

25.00%

发文量

140

期刊介绍： Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.