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<p>This study utilizes a rapid electrical resistance heating (ERH) technique to achieve complete microstructural reset and mechanical property recovery in plastically deformed SUS304 austenitic stainless steel, which addresses critical limitations in the sustainable metal manufacturing of high-performance components. Through multi-cycle interrupted tensile testing combined with controlled electric current parameters (350&#xa0;A/2&#xa0;s), the developed 2-s ERH processing method enables a complete recovery of original mechanical properties in 40% pre-strained samples, with yield strength reverting from approximate 600–260&#xa0;MPa (virgin material: 260 ± 5&#xa0;MPa). Microstructure analysis reveals that ERH facilitates the martensite-to-austenite reversion and dislocation annihilation during rapid recrystallization, which can be understood as the main reason of the mechanical property recovery. Specifically, the recrystallized grain fraction recovers from 1.8% in 40% pre-strain state to 96.5% (97.1% in base material), while the martensite phase decreases from 35.7 to 3.3% (5.5% in base material), and the Kernel average misorientation values revert from 1.28 to 0.33 (0.32 in base material) after ERH. These microstructure resets enable unprecedented mechanical property recovery to its original level with the entire processing time being only two seconds. The present study provides experimental evidence of full cyclic recovery in metastable stainless steels, facilitating closed-loop remanufacturing in multi-stage forming operations.</p>

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Rapid microstructural reset and mechanical property recovery in cold-worked austenitic stainless steel via electrical resistance heating

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Yuanbo Chu,
  • Jing Li,
  • Jian Gao,
  • Yiyue Zhang

摘要

This study utilizes a rapid electrical resistance heating (ERH) technique to achieve complete microstructural reset and mechanical property recovery in plastically deformed SUS304 austenitic stainless steel, which addresses critical limitations in the sustainable metal manufacturing of high-performance components. Through multi-cycle interrupted tensile testing combined with controlled electric current parameters (350 A/2 s), the developed 2-s ERH processing method enables a complete recovery of original mechanical properties in 40% pre-strained samples, with yield strength reverting from approximate 600–260 MPa (virgin material: 260 ± 5 MPa). Microstructure analysis reveals that ERH facilitates the martensite-to-austenite reversion and dislocation annihilation during rapid recrystallization, which can be understood as the main reason of the mechanical property recovery. Specifically, the recrystallized grain fraction recovers from 1.8% in 40% pre-strain state to 96.5% (97.1% in base material), while the martensite phase decreases from 35.7 to 3.3% (5.5% in base material), and the Kernel average misorientation values revert from 1.28 to 0.33 (0.32 in base material) after ERH. These microstructure resets enable unprecedented mechanical property recovery to its original level with the entire processing time being only two seconds. The present study provides experimental evidence of full cyclic recovery in metastable stainless steels, facilitating closed-loop remanufacturing in multi-stage forming operations.