Deformation behavior in cold-rolled medium-manganese TRIP steel and effect of pre-strain on the Lüders bands

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• 作者：Z.C. Li^a ; ^b ; H. Ding^a ; ^{dinghuaneu@163.com" class="auth_mail" title="E-mail the corresponding author} ; R.D.K. Misra^b ; ^{dmisra2@utep.edu" class="auth_mail" title="E-mail the corresponding author} ; Z.H. Cai^a
• 关键词：Austenite stability ; Deformation behavior ; Pre-strain ; L&uuml ; ders bands ; TRIP steel
• 刊名：Materials Science & Engineering A
• 出版年：2017
• 出版时间：2 January 2017
• 年：2017
• 卷：679
• 期：Complete
• 页码：230-239
• 全文大小：2518 K

文摘

Deformation behavior was studied in cold-rolled 0.2C-1.6Al-6.1Mn-Fe transformation-induced plasticity (TRIP) steel subjected to intercritical annealing. The steel intercritically hardened at 650 ℃ exhibited excellent mechanical properties, and the excellent ductility was primarily associated with the discontinuous TRIP effect. Moreover at 650 ℃, the formation of Lüders bands was associated with TRIP effect and cooperative dislocation glide. The length of Lüders strain was gradually reduced with increasing pre-strain, and was eventually eliminated when the pre-strain was increased to 10%. The increased average stability of retained austenite and increased dislocation density in ferrite induced by pre-strain was responsible for decrease and ultimate elimination of Lüders bands. While in steel intercritically annealed at 600 ℃, ferrite and austenite was predominantly deformed, which was responsible for poor work hardening rate and inferior tensile properties.