Strain hardening behavior and deformation substructure of Fe–20/27Mn–4Al–0.3C non-magnetic steels. (15th February 2016)

• Record Type: Journal Article
• Authors: Ma, Biao; Li, Changsheng; Zheng, Jianjun; Song, Yanlei; Han, Yahui
• Is Part Of: Materials & design. Volume 92(2016)
• Page Start: 313
• Page End: 321
• Publication Date: 2016-02-15
• Subjects: Non-magnetic steel -- Work hardening -- Twin -- Microbands -- Dislocation density; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.12.038
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The association of strain hardening behavior with deformation substructure evolution, including dislocation substructures, mechanical twinning and microbands formation, was investigated in Fe–20/27Mn–4Al–0.3C non-magnetic steels. The critical stress for both twinning and microbanding were also estimated. With stacking fault energy enhanced to low-to-medium level, twin activation was largely diminished by reducing twin volume fraction and increasing their average spacing, such that the strain hardening rate was controlled mainly by dislocation strengthening and consequently presented a monotonous and rapid drop during entire tensile deformation process. In addition, the aggravated deformation heterogeneity in grain interior by less twin generation probably contributed to the preferential microbands formation along domain boundaries. Graphical abstract: Highlights: Critical stress for twin and microbands was estimated in non-magnetic steels. Less twin formation increases intragranular deformation heterogeneity. Deformation heterogeneity probably promotes microbands formation along domain boundary. Strengthening contribution of diminished TWIP effect was evaluated.