Microstructure and deformation behavior of the hot-rolled medium manganese steels with varying aluminum-content

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• 作者：Z.H. Cai^a ; ^{tsaizhihui@163.com" class="auth_mail" title="E-mail the corresponding author} ; B. Cai^a ; H. Ding^a ; Y. Chen^a ; R.D.K. Misra^b ; ^{dmisra2@utep.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Austenite stability ; δ-ferrite ; TRIP effect ; Work hardening ; Tensile properties
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：31 October 2016
• 年：2016
• 卷：676
• 期：Complete
• 页码：263-270
• 全文大小：3759 K

文摘

We elucidate here the mechanistic contribution of the interplay between microstructural constituents and plastic deformation behavior in hot-rolled Fe-0.2C-11Mn-xAl steels containing 2–6 wt% Al. The decrease in austenite fraction with increase in Al-content was accompanied by decrease in tensile strength, while the δ-ferrite content and ductility increased. 2Al steel was characterized by ultrahigh ultimate tensile strength (UTS) of 1407 MPa, while 6Al steel exhibited extremely high total elongation (TE) of 65%. The superior ductility in 6Al steel is attributed to cumulative contribution of transformation induced plasticity (TRIP) effect and twinning induced plasticity (TWIP) effect. The increase in soft δ-ferrite phase with low microhardness led to increase in TE and decrease in UTS and work hardening rate.