LUO, Quanshun, KITCHEN, Matthew, PATEL, Vinay, FILLEU, Martin and OWENS, Dave (2015). Partial-Isothermally-Treated Low Alloy Ultrahigh Strength Steel With Martensitic/Bainitic Microstructure. In: HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015. Hoboken, NJ, John Wiley & Sons, 433-438.Full text not available from this repository.
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<sup>0</sup>C). 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.
|Item Type:||Book Section|
|Research Institute, Centre or Group:||Materials and Engineering Research Institute > Materials Analysis and Research Services|
|Depositing User:||Helen Garner|
|Date Deposited:||11 Jan 2016 11:53|
|Last Modified:||11 Jan 2016 11:53|
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