Partial-Isothermally-Treated Low Alloy Ultrahigh Strength Steel With Martensitic/Bainitic Microstructure

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.

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Link to published version:: 10.1002/9781119223399.ch50


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 &sim;2,100 MPa, yield strength &sim;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
Identification Number: 10.1002/9781119223399.ch50
Depositing User: Helen Garner
Date Deposited: 11 Jan 2016 11:53
Last Modified: 11 Jan 2016 11:53

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