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<p>The applications of various grades of duplex stainless steels (DSSs) are increasing and lately, the main focus has been on lean grades due to their lower cost. There are attempts to replace the conventional austenitic grades like AISI 304 and AISI 316 with lean DSS grades like UNS S32101 and UNS S32304 with reasonable success. Lean grades of DSSs find applications in heat exchangers, storage tanks, bridges, and other structural components. The growth of lean DSSs in applications is due to their improved weldability and less intermetallic precipitation. This review article focuses on the different welding techniques and heat treatment processes adapted for enhancing the mechanical and corrosion properties of the newly developed lean DSS grades. This work systematically summarizes the suitable parameters for good weldability and heat treatment. Also, the importance of microstructure and phase balance is understood for different parameters, and the austenite reformation mechanism in the weld zones is reviewed. This article gives preliminary knowledge to the researchers working on the material characterization of welded lean duplex grades and also describes the recent techniques adapted for industrial applications.</p>

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Correlation of heat treatment and welding processes with microstructure, mechanical properties and corrosion behaviour of lean duplex stainless steels: a review

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Sravanthi Gudikandula,
  • Amit Kumar,
  • Tushar R. Dandekar,
  • Ambuj Sharma,
  • Rajesh Kisni Khatirkar

摘要

The applications of various grades of duplex stainless steels (DSSs) are increasing and lately, the main focus has been on lean grades due to their lower cost. There are attempts to replace the conventional austenitic grades like AISI 304 and AISI 316 with lean DSS grades like UNS S32101 and UNS S32304 with reasonable success. Lean grades of DSSs find applications in heat exchangers, storage tanks, bridges, and other structural components. The growth of lean DSSs in applications is due to their improved weldability and less intermetallic precipitation. This review article focuses on the different welding techniques and heat treatment processes adapted for enhancing the mechanical and corrosion properties of the newly developed lean DSS grades. This work systematically summarizes the suitable parameters for good weldability and heat treatment. Also, the importance of microstructure and phase balance is understood for different parameters, and the austenite reformation mechanism in the weld zones is reviewed. This article gives preliminary knowledge to the researchers working on the material characterization of welded lean duplex grades and also describes the recent techniques adapted for industrial applications.