Hot compression deformation behavior of AISI 321 austenitic stainless steel
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第6期
论文作者：Mehdi Haj Hojjatollah Mansouri Reza Vafaei Golam Reza Ebrahimi Ali Kanani
文章页码：529 - 534
摘 要：The hot compression behavior of AISI 321 austenitic stainless steel was studied at the temperatures of 950- 1100 C and the strain rates of 0.01-1s1 using a Baehr DIL-805 deformation dilatometer. The hot deformation equations and the relationship between hot deformation parameters were obtained. It is found that strain rate and deformation temperature significantly influence the flow stress behavior of the steel. The work hardening rate and the peak value of flow stress increase with the decrease of deformation temperature and the increase of strain rate. In addition, the activation energy of deformation （Q） is calculated as 433.343kJ/mol. The microstructural evolution during deformation indicates that, at the temperature of 950C and the strain rate of 0.01s1 , small circle-like precipitates form along grain boundaries; but at the temperatures above 950C, the dissolution of such precipitates occurs. Energy-dispersive X-ray analyses indicate that the precipitates are complex carbides of Cr, Fe, Mn, Ni, and Ti.
Mehdi Haj1，Hojjatollah Mansouri1，Reza Vafaei1，Golam Reza Ebrahimi2，Ali Kanani1
1. Department of Materials Engineering, Malek Ashtar University of Technology2. Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University
摘 要：The hot compression behavior of AISI 321 austenitic stainless steel was studied at the temperatures of 950- 1100 C and the strain rates of 0.01-1s1 using a Baehr DIL-805 deformation dilatometer. The hot deformation equations and the relationship between hot deformation parameters were obtained. It is found that strain rate and deformation temperature significantly influence the flow stress behavior of the steel. The work hardening rate and the peak value of flow stress increase with the decrease of deformation temperature and the increase of strain rate. In addition, the activation energy of deformation （Q） is calculated as 433.343kJ/mol. The microstructural evolution during deformation indicates that, at the temperature of 950C and the strain rate of 0.01s1 , small circle-like precipitates form along grain boundaries; but at the temperatures above 950C, the dissolution of such precipitates occurs. Energy-dispersive X-ray analyses indicate that the precipitates are complex carbides of Cr, Fe, Mn, Ni, and Ti.
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