Effects of deformation parameters on formation of pro-eutectoid cementite in hypereutectoid steels
SCIE
SCOPUS
- Title
- Effects of deformation parameters on formation of pro-eutectoid cementite in hypereutectoid steels
- Authors
- Guan, RG; Zhao, ZY; Chao, RZ; Liu, XH; Lee, CS
- Date Issued
- 2014-04
- Publisher
- Springer
- Abstract
- Brittle pro-eutectoid cementite that forms along prior-austenite in hypereutectoid steels is deleterious to mechanical properties. The optimum process parameters which suppress the formation of pro-eutectoid cementite in hypereutectoid steels with carbon content in the range of 0.8%-1.3% in mass fraction, were investigated. Pro-eutectoid cementite formation is effectively hindered by increasing the deformation temperature and decreasing the amount of strain. Transformation at lower temperatures close to the nose of the cooling-transformation diagram also reduces the tendency of the formation of pro-eutectoid cementite. Control of prior-austenite grain size and grain boundary conditions is important. Due to larger number of nucleation sites, finer prior-austenite grain size results in the acceleration of transformation to pro-eutectoid cementite. However, large prior-austenite and straight boundaries lead to less nucleation sites of pro-eutectoid cementite. The cooling rate and carbon content should be reduced as much as possible. The transformation temperature below 660 A degrees C and the strain of 0.5 at deformation temperature of 850 A degrees C are suggested.
- Keywords
- pro-eutectoid cementite; hypereutectoid steel; hot deformation; transformation; temperature; TI MICROALLOYED STEEL; MECHANICAL-PROPERTIES; PRECIPITATION; MICROSTRUCTURE; DISSOLUTION; DIFFUSION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13632
- DOI
- 10.1007/S11771-014-2060-Y
- ISSN
- 2095-2899
- Article Type
- Article
- Citation
- JOURNAL OF CENTRAL SOUTH UNIVERSITY, vol. 21, no. 4, page. 1256 - 1263, 2014-04
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