What does this research mean for the field?

Post-weld heat treatment at 1050°C optimizes the microstructure of laser-welded UNS S32001 lean duplex stainless steel joints by achieving a near-equal ferrite-austenite ratio, which significantly enhances pitting corrosion resistance. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the influence of post-weld heat treatment temperatures on phase transformation kinetics, microstructure evolution, and pitting corrosion resistance in laser-welded UNS S32001 lean duplex stainless steel joints.

September 5, 2026steel research international

Optimization of Microstructure and Pitting Corrosion Resistance in Laser‐Welded UNS S32001 Lean Duplex Stainless Steel Joints by Post Weld Heat Treatment

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Authors

WGWenbin Gao CZChunhai Zhen QHQinglin Han

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Overview

Experimental study demonstrates optimal corrosion resistance at 1050°C post-weld heat treatment in laser-welded stainless steel, highlighting the benefit of balanced dual-phase microstructure.

Key Points

To evaluate the influence of post-weld heat treatment temperatures on phase transformation kinetics, microstructure evolution, and pitting corrosion resistance in laser-welded UNS S32001 lean duplex stainless steel joints.
Subjected laser-welded UNS S32001 joints to post-weld heat treatment (PWHT) at temperatures between 950°C and 1250°C for 30 minutes.
Quantified microstructural changes and austenite-ferrite phase ratios across treatment conditions.
Evaluated electrochemical corrosion performance by measuring critical pitting temperature, breakdown potential, corrosion current density, and polarization resistance.
The as-welded joint exhibited a ferrite-dominated matrix with 20.7% austenite, whereas PWHT at 1050°C yielded a refined, interwoven dual-phase structure with 49.6% austenite.
Heat treatment at 950°C produced Widmanstätten austenite (52.5%), whereas temperatures of 1150°C and 1250°C caused austenite dissolution down to 44.3% and 32.5%, respectively, along with severe grain coarsening.
The 1050°C treatment produced optimal pitting corrosion resistance, reaching a critical pitting temperature of ~78.4°C (vs. 71.1°C as-welded), breakdown potential Eb of 0.678 VSCE, icorr of 4.175 × 10−7 A·cm−2, and polarization resistance Rp of 283.9 kΩ·cm2.

Cite This Study

Gao et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4216b95aff0620eb984 https://doi.org/10.1002/srin.70600

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September 5, 2026steel research international

Optimization of Microstructure and Pitting Corrosion Resistance in Laser‐Welded UNS S32001 Lean Duplex Stainless Steel Joints by Post Weld Heat Treatment

View Full Paper

Ask AI

Bookmark

Authors

WGWenbin Gao CZChunhai Zhen QHQinglin Han

Discussion

Member takes

Overview

Experimental study demonstrates optimal corrosion resistance at 1050°C post-weld heat treatment in laser-welded stainless steel, highlighting the benefit of balanced dual-phase microstructure.

Key Points

To evaluate the influence of post-weld heat treatment temperatures on phase transformation kinetics, microstructure evolution, and pitting corrosion resistance in laser-welded UNS S32001 lean duplex stainless steel joints.
Subjected laser-welded UNS S32001 joints to post-weld heat treatment (PWHT) at temperatures between 950°C and 1250°C for 30 minutes.
Quantified microstructural changes and austenite-ferrite phase ratios across treatment conditions.
Evaluated electrochemical corrosion performance by measuring critical pitting temperature, breakdown potential, corrosion current density, and polarization resistance.
The as-welded joint exhibited a ferrite-dominated matrix with 20.7% austenite, whereas PWHT at 1050°C yielded a refined, interwoven dual-phase structure with 49.6% austenite.
Heat treatment at 950°C produced Widmanstätten austenite (52.5%), whereas temperatures of 1150°C and 1250°C caused austenite dissolution down to 44.3% and 32.5%, respectively, along with severe grain coarsening.
The 1050°C treatment produced optimal pitting corrosion resistance, reaching a critical pitting temperature of ~78.4°C (vs. 71.1°C as-welded), breakdown potential Eb of 0.678 VSCE, icorr of 4.175 × 10−7 A·cm−2, and polarization resistance Rp of 283.9 kΩ·cm2.

Cite This Study

Gao et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4216b95aff0620eb984 https://doi.org/10.1002/srin.70600

View Full Paper

Ask AI

Bookmark