Effect of prior austenite grain size on the evolution of microstructure and mechanical properties of an intercritically annealed medium manganese steel
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
View Archive Info| Field | Value | |
| Title |
Effect of prior austenite grain size on the evolution of microstructure and mechanical properties of an intercritically annealed medium manganese steel
|
|
| Creator |
Chandan, A K
Bansal, G K Kundu, J Chakraborty, J Ghosh Chowdhury, S |
|
| Subject |
Steel Metallurgy
|
|
| Description |
This paper presents the influence of prior austenite grain (PAG) size on the evolution of microstructure and mechanical properties in an intercritically annealed medium manganese steel (Fe- 8.1 Mn - 0.3 C- 1.1 Si- 1.5 Al). The hot forged alloy was austenitized at two different temperature-time combination to achieve the PAG size of ∼20 m (sample 1) and ∼40 m (sample 2). Both the samples retained a small amount of austenite after the austenitization treatment. The sample 1 with smaller PAG size stabilized a significantly higher amount of austenite (∼54.4 ± 0.6 vol%) after the intercritical annealing treatment than the sample 2 (∼39.3 ± 0.7 vol%). Composition as well as dimension of the austenite films were found to be different in the two samples. Sample 1 displayed a better combination of strength and ductility (1096 ± 30 MPa and 32 ± 4.2%, respectively) as compared to the sample 2 (1026 ± 30 MPa and 22 ± 1.9%, respectively). The superior mechanical properties of sample 1 were ascribed to the cumulative effect of the higher volume fraction and lower stability of retained austenite in sample 1 as compared to the sample 2. Fracture surface investigation revealed that the sample 1 experienced microvoid mediated ductile fracture, whereas sample 2 displayed brittle fracture facilitated by crack propagation along certain cleavage facets.
|
|
| Publisher |
Elsevier
|
|
| Date |
2019-12
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://eprints.nmlindia.org/8059/1/A.K._Chandan.pdf
Chandan, A K and Bansal, G K and Kundu, J and Chakraborty, J and Ghosh Chowdhury, S (2019) Effect of prior austenite grain size on the evolution of microstructure and mechanical properties of an intercritically annealed medium manganese steel. Materials Science and Engineering: A , 768 (IF-4.081). p. 138458. |
|
| Relation |
https://doi.org/10.1016/j.msea.2019.138458
http://eprints.nmlindia.org/8059/ |
|