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<p>In this study, the durability of automotive suspension coil springs subjected to various warm shot peening (WSP) processes was assessed in air and corrosive environments. Rockwell tests showed that WSP maintained its hardness and produced springs with slightly higher surface roughness than those processed via mass production shot peening (MSP). Compared with MSP springs, WSP springs exhibited 0.9-14% lower surface compressive residual stress (SCRS) and 2.1-15% higher maximum compressive residual stress (MCRS), along with improved micro-Vickers hardness distribution and 2.3-25.8% higher air durability life (ADL). MCRS affected the ADL of WSP springs processed at 200&#xa0;°C, and higher SCRS increased corrosion durability life (CDL) by 24.4-48.6%. Fractographic examinations revealed flat fracture surfaces in air tests and helical forms in corrosion tests, with no significant differences in crack development behavior across samples. Microstructural fracture behaviors were similar across all samples, and WSP springs exhibited 12.4-39.4% smaller damage width than MSP springs. WSP demonstrated significant benefits in CDL with increased compressive residual stress. Correlations between qualitative and quantitative analyses led to reliable conclusions regarding the optimal processing conditions for enhancing safety and durability.</p>

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Reliability Evaluation of Warm Shot Peening Conditions on the Corrosion Durability Life of Automotive Suspension Coil Springs

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Jae Ki Kwon,
  • Min Hyuk Kim,
  • Jong Hwi Park,
  • Jung Il Jeon,
  • Tae Jun Sohn

摘要

In this study, the durability of automotive suspension coil springs subjected to various warm shot peening (WSP) processes was assessed in air and corrosive environments. Rockwell tests showed that WSP maintained its hardness and produced springs with slightly higher surface roughness than those processed via mass production shot peening (MSP). Compared with MSP springs, WSP springs exhibited 0.9-14% lower surface compressive residual stress (SCRS) and 2.1-15% higher maximum compressive residual stress (MCRS), along with improved micro-Vickers hardness distribution and 2.3-25.8% higher air durability life (ADL). MCRS affected the ADL of WSP springs processed at 200 °C, and higher SCRS increased corrosion durability life (CDL) by 24.4-48.6%. Fractographic examinations revealed flat fracture surfaces in air tests and helical forms in corrosion tests, with no significant differences in crack development behavior across samples. Microstructural fracture behaviors were similar across all samples, and WSP springs exhibited 12.4-39.4% smaller damage width than MSP springs. WSP demonstrated significant benefits in CDL with increased compressive residual stress. Correlations between qualitative and quantitative analyses led to reliable conclusions regarding the optimal processing conditions for enhancing safety and durability.