Effect of heat treatment on cyclic deformation properties of Fe–26Mn–10Al–C steel
He Li1,2, Jian-ping Zhao1,2, Zhan-yu Wang1,2, Li Ding1,2
1 School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
2 Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, Jiangsu, China
Effect of heat treatment on cyclic deformation properties of Fe–26Mn–10Al–C steel
He Li1,2, Jian-ping Zhao1,2, Zhan-yu Wang1,2, Li Ding1,2
1 School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
2 Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, Jiangsu, China
摘要 Fully reversed tensile–compression low-cycle fatigue tests were performed at room temperature under strain amplitude of 0.4%. The monotonic tensile results show that Fe–26Mn–10Al–C steels are fully austenite and the optimal combination of ultimate tensile strength and total elongation was present at 950 °C with 65 GPa %. The fatigue results show that the specimen at 1050 °C has the maximum fatigue life of 162,000 cycles, which is much longer than twinning-induced plasticity (TWIP) steels of the same strain amplitude. The hot-forging specimen shows high similarity with TWIP steels with rapid initial cyclic hardening followed by cyclic softening and cyclic saturation. After solution heat treatment, it is noteworthy that, after rapid initial cyclic softening, another rapid cyclic hardening and a following decrease with fluctuation were observed at 1000 °C. It is reasonable to believe that it is caused by κ-carbides precipitated during cyclic deformation. Another interesting phenomenon is cyclic stress subsidence observed at 1050 °C during its saturation stage at the last quarter of the fatigue life, and the span is about 12.5% of whole fatigue life.
Abstract：Fully reversed tensile–compression low-cycle fatigue tests were performed at room temperature under strain amplitude of 0.4%. The monotonic tensile results show that Fe–26Mn–10Al–C steels are fully austenite and the optimal combination of ultimate tensile strength and total elongation was present at 950 °C with 65 GPa %. The fatigue results show that the specimen at 1050 °C has the maximum fatigue life of 162,000 cycles, which is much longer than twinning-induced plasticity (TWIP) steels of the same strain amplitude. The hot-forging specimen shows high similarity with TWIP steels with rapid initial cyclic hardening followed by cyclic softening and cyclic saturation. After solution heat treatment, it is noteworthy that, after rapid initial cyclic softening, another rapid cyclic hardening and a following decrease with fluctuation were observed at 1000 °C. It is reasonable to believe that it is caused by κ-carbides precipitated during cyclic deformation. Another interesting phenomenon is cyclic stress subsidence observed at 1050 °C during its saturation stage at the last quarter of the fatigue life, and the span is about 12.5% of whole fatigue life.
He Li,Jian-ping Zhao,Zhan-yu Wang, et al. Effect of heat treatment on cyclic deformation properties of Fe–26Mn–10Al–C steel[J]. Journal of Iron and Steel Research International, 2019, 26(2): 200-210.
2019, Vol. 26 
