【摘 要】
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We introduce a new strengthening heat treatment of a Ni-Cr-Mo-V alloyed spring steel by partial isothermal salt-bath and subsequent air-cooling and temperin
【机 构】
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Materials and Engineering Research Institute,Sheffield Hallam University,Howard Street,Sheffield,S1
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We introduce a new strengthening heat treatment of a Ni-Cr-Mo-V alloyed spring steel by partial isothermal salt-bath and subsequent air-cooling and tempering.Detailed isothermal treatments were made at temperatures below or above the Ms point(230℃).The salt bath time was controlled between 10 and 80 minutes.Through the new treatment,the candidate steel developed ultrahigh tensile strength~2,100 MPa,yield strength~1,800 MPa,elongation 8-10%,hardness 580-710 HV,and V-notch Charpy toughness 10-12 J.Optical and electron microscopic observations and X-ray diffraction revealed multi-phase microstructures of bainitic/martensitic ferrites,fine carbide precipitates and retained austenite.Carbon partitioning during the bainitic/martensitic transformation was investigated for its remarkable influence on the strengthening mechanism.
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