Developing bearing steels combining hydrogen resistance and improved hardness

Szost, B. A. and Vegter, R. H. and Rivera-Díaz-del-Castillo, P. E J (2013) Developing bearing steels combining hydrogen resistance and improved hardness. Materials and Design, 43. pp. 499-506. ISSN 0261-3069

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Abstract

Thermodynamic and kinetic computational modelling are combined to conceive a hydrogen resistant bearing steel. Existing hydrogen resistant steels are not appropriate for bearings due to their low hardness. The proposed microstructure combines a martensitic matrix in which fine cementite precipitates impart strength, and V4C3 nano-scaled particles acting as hydrogen traps. It is demonstrated that the conflicting objectives of ultra-hardness and hydrogen resistance can be concealed by: (1) Adding 0.5wt.% V to 100Cr6, which allows to preserve existing steel production technology. (2) Following a novel heat treatment procedure consisting of austenitisation (and a subsequent temperature spike to dissolve coarse V4C3), followed by tempering at 600°C where V4C3 particles form (and a subsequent temperature spike to dissolve coarse cementite), followed by quench and tempering at 215°C, where fine cementite strengthening particles form. The enhanced trapping capacity of the new steel is demonstrated via thermal desorption; the presence of the desired microstructure after heat treatment is proved via transmission electron microscopy. Concomitant with the trapping ability, a significant hardness increase was observed; this was ascribed to the controlled V4C3 precipitation.

Item Type:
Journal Article
Journal or Publication Title:
Materials and Design
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2210
Subjects:
ID Code:
125545
Deposited By:
Deposited On:
25 May 2018 12:34
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Sep 2020 04:44