Development of 1200HV-Class Gas Atomized Fe-Cr-B Alloy Powder for Shot Peening

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  • ショットピーニング用１２００ＨＶ級Ｆｅ‐Ｃｒ‐Ｂ系ガスアトマイズ合金粉末の開発
  • ショットピーニング用1200HV級Fe-Cr-B系ガスアトマイズ合金粉末の開発
  • ショット ピーニングヨウ 1200HVキュウ Fe Cr Bケイ ガス アトマイズ ゴウキン フンマツ ノ カイハツ

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Abstract

  Shot peening is a surface treatment effective to obtain compressive residual stress on shot peened surface and to improve fatigue strength, and it is applied to automobile parts such as springs and gears. Based on recent trend for further reduction of automobile parts weight, high hardness of automobile parts will be required more and more through various treatments such as carburizing.<br>    In this study to develop gas atomized powder for shot peening with high hardness, high density, high ductility and relatively low cost, Fe-8Cr-6.5B alloy was made by gas atomizing and its various properties were examined. The resultant Vickers hardness was 1260HV, density was 7.4Mg/m3, and no crack initiated near indentation by 1000 g load. No rust was observed in the condition of 343 K-95%RH-96h. Various properties of gas carburized JIS SCM420 with shot peening by developed Fe-8Cr-6.5B powder were compared to that with shot peening by high speed steel powder. JIS SCM420 with Fe-8Cr-6.5B powder shot peening showed higher compressive residual stress at the surface by 110 MPa, higher Vickers hardness (load=100 g) by 60HV and higher fatigue strength by about 100 MPa than that with high speed steel powder shot peening.<br>

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