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Volume 26 Issue 1
Sep.  2013
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Citation:
shu

Laser surface alloying of 40Cr steel with carbon

  • 1.

    Department of Material Science & Technology, Kunming University of Science & Technology, Kunming, 650093;

  • 2.

    College of Materials, Shanghai Jiaotong University, Shanghai, 200030

  • Received Date: 2000-11-27
  • The 40Cr steel has been surface-alloyed with a pre deposited carbon powder layer by laser beam.White cast iron is obtained on the surface of the sample with a depth of 0.25～0.35mm.The microstructure of the melted zone is pre-dendrite and eutectic ledeburite whose size is obviously refined by the rapid quench.Its micro hardness can get up to 1200HV0.3.The microstructure of the heat-affected zone is martensite with two sub-layers,one of which is pin-like martensite and the other,no-pin martensite.It indicates that the higher the scanning speed and power density,the smaller the grain,and therefore the higher the micro hardness.The wear test shows that the wear resistance of the specimens has been encreased by 50% than the general quenched samples.
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  • [1] Gnanamuthu D S.激光科学与工艺,1982,13:65.
    [2]

    Gnanamuthu D S.Laser Surface Treatment.In:Metzbower E A ed.Application of Lasers in Materials processing,Material Park:OH Am Soc for metals,1979:177.
    [3] 李智,马椿喻,刘相华 et al.材料科学与工程,1999,17(2):81～84.
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  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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Laser surface alloying of 40Cr steel with carbon

  • 1. Department of Material Science & Technology, Kunming University of Science & Technology, Kunming, 650093;
  • 2. College of Materials, Shanghai Jiaotong University, Shanghai, 200030
  • Received Date: 2000-11-27
  • Available Online: 2002-01-25

Abstract: The 40Cr steel has been surface-alloyed with a pre deposited carbon powder layer by laser beam.White cast iron is obtained on the surface of the sample with a depth of 0.25～0.35mm.The microstructure of the melted zone is pre-dendrite and eutectic ledeburite whose size is obviously refined by the rapid quench.Its micro hardness can get up to 1200HV0.3.The microstructure of the heat-affected zone is martensite with two sub-layers,one of which is pin-like martensite and the other,no-pin martensite.It indicates that the higher the scanning speed and power density,the smaller the grain,and therefore the higher the micro hardness.The wear test shows that the wear resistance of the specimens has been encreased by 50% than the general quenched samples.

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