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<p>HT250 gray cast irons were processed by laser cavitation peening (LCP). The electrochemical corrosion performance of HT250 gray cast iron subjected to massive LCP treatment under various electrolyte concentration and immersion was systemically studied. The residual stress distribution and microstructure evolutionof LCP treated HT250 were investigated. Based on the experiment results, the effect of LCP and the corrosion mechanism were discussed. LCP processing significantly enhances the corrosion resistance of HT250. The corrosion potential in a 3.5% NaCl solution shifted positively from − 1.153&#xa0;V (substrate) to -1.126&#xa0;V after four LCP impacts, while the corrosion current density decreased. The improvement was more pronounced with an increasing number of impacts. Furthermore, LCP introduced considerable compressive residual stress on the surface, reaching a maximum of -302&#xa0;MPa after four impacts, and led to progressive grain refinement. However, in high-concentration NaCl solutions (14%), long-term immersion (120&#xa0;min) diminished this advantage, with the corrosion resistance of LCP-treated specimens becoming comparable to the substrate. The impact of LCP induces residual compressive stress on the HT250 surface and refines the grains.</p>

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Microstructure, residual stress and electrochemical corrosion behavior of gray cast iron subjected to massive laser cavitation peening

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Hongjian Cai,
  • Jiayang Gu

摘要

HT250 gray cast irons were processed by laser cavitation peening (LCP). The electrochemical corrosion performance of HT250 gray cast iron subjected to massive LCP treatment under various electrolyte concentration and immersion was systemically studied. The residual stress distribution and microstructure evolutionof LCP treated HT250 were investigated. Based on the experiment results, the effect of LCP and the corrosion mechanism were discussed. LCP processing significantly enhances the corrosion resistance of HT250. The corrosion potential in a 3.5% NaCl solution shifted positively from − 1.153 V (substrate) to -1.126 V after four LCP impacts, while the corrosion current density decreased. The improvement was more pronounced with an increasing number of impacts. Furthermore, LCP introduced considerable compressive residual stress on the surface, reaching a maximum of -302 MPa after four impacts, and led to progressive grain refinement. However, in high-concentration NaCl solutions (14%), long-term immersion (120 min) diminished this advantage, with the corrosion resistance of LCP-treated specimens becoming comparable to the substrate. The impact of LCP induces residual compressive stress on the HT250 surface and refines the grains.