Effect of Sulfur Content on the Composition of Inclusions and MnS Precipitation Behavior in Bearing Steel
Open Access
- 27 April 2020
- Vol. 10 (5), 570
- https://doi.org/10.3390/met10050570
Abstract
MnS inclusions in bearing steel have long been considered to significantly affect the fatigue life of bearing steel. In this paper, the sizes of inclusions in bearing steel with different sulfur contents were analyzed and the precipitation behavior of MnS was calculated using thermodynamics. Furthermore, the positive role of MnS in bearing steel was discussed. Results showed that when the size of inclusions in bearing steel was increased, the proportion of MnS components in composite inclusions gradually decreased. When the sulfur content was increased, the shape of inclusions changed from a particle shape to a strip shape. With increasing MnS content, the inclusion ratio of Al2O3 was significantly reduced in the Al2O3–CaO–MgO–MnS quaternary inclusion system, particularly for MnS proportions greater than 20%. The content of sulfur in bearing steel significantly affects the precipitation temperature of MnS. When sulfur content increases from 0.001% to 0.007%, the precipitation temperature of MnS increases from 1493 K to 1633 K as the precipitation of MnS moves from the austenite solid phase to the liquid and solid phases, and the precipitation size of MnS inclusions significantly increases. The size of oxide inclusions should be controlled to improve MnS wrap oxide inclusions in steel. Based on these results, a composition control with high sulfur levels and low oxygen levels should be adopted to improve the fatigue performance of steel.Keywords
This publication has 30 references indexed in Scilit:
- CALPHAD-assisted morphology control of manganese sulfide inclusions in free-cutting steelsJournal of Alloys and Compounds, 2018
- Non-metallic inclusions in steels - origin and controlJournal of Materials Research and Technology, 2018
- The Effect of Different Non-Metallic Inclusions on the Machinability of SteelsMaterials, 2015
- Oxide Formation Mechanisms in High Manganese Steel WeldsMetallurgical and Materials Transactions, 2013
- Effect of Sulfur Content and Sulfide Shape on Fracture Ductility in Case Hardening SteelJournal of Iron and Steel Research International, 2011
- Study of rolling contact fatigue of bearing steels in relation to various oxide inclusionsMaterials & Design (1980-2015), 2011
- Effects of rare earth on inclusions and corrosion resistance of 10PCuRE weathering steelJournal of Rare Earths, 2010
- The influence of sulphur content on the quality of laser cutting of steelJournal of the American Academy of Dermatology, 2007
- Effects of manganese and sulfur contents and slab reheating temperatures on the magnetic properties of non-oriented semi-processed electrical steel sheetJournal of Magnetism and Magnetic Materials, 2001
- Influence of sulphur content and inclusion distribution on the hydrogen induced blister cracking in pressure vessel and pipeline steelsCorrosion Science, 2001