摘要
通过大变形异步-同步轧制及随后600℃和700℃退火处理,成功制备了超细晶高锰TWIP钢,并研究了退火处理对大变形TWIP钢的组织和性能的影响.研究结果表明:经96%异步-同步大变形轧制后,材料组织显著细化,抗拉强度从621 MPa大幅提升至2 050 MPa;经过600℃退火后,大变形轧制TWIP钢的组织基本完成了再结晶,材料的平均晶粒尺寸约为500 nm,抗拉强度1 079 MPa,延伸率达到了29%;而经过700℃退火后,大变形TWIP钢的组织发生了完全再结晶,平均晶粒尺寸约为600 nm,抗拉强度达到了1 101 MPa,延伸率达到了54%.退火后的组织中存在大量的层错、位错胞等亚结构.相对于大变形轧制态和600℃退火态,700℃退火态的超细晶TWIP钢的优异的综合力学性能,主要源于孪晶诱发塑性变形机制及合金较低的层错能.
The ultrafine-grained（ UFG） high-Mn austenitic steels are successfully produced by combination of heavily asymmetric rolling（ ASR） and symmetric rolling（ SR） method and the subsequent annealing treatment at 600 ℃ and700 ℃. The effect of the annealing treatment on the microstructures and properties of UFG TWIP steel is studied.The result shows that the microstructures are greatly refnined after heavily cold ASR-SR processing and the ultimate tensile strength（ UTS） of the steel is increased from 621 MPa to 2 050 MPa. After 600 ℃ annealing treatament,the average grain size of the UFG TWIP steel is about 500 nm and the UTS and elongation are 1 079 MPa and 29%,respectively. After 700 ℃ annealing treatament,the average grain size of the steel is increased to 600 nm and the UTS and elongation are 1 101 MPa and 54%,respectively. The microstructures also mainly comprise high density stacking faults,dislocations in the annealed heavily ASR-SRed TWIP steels. In comparison of the heavily ASR-SRed and the 600 ℃ annealed steels,the excellent comprehensive mechanic properties of the 700 ℃ annealed UFG TWIP steelis mainly attributed to the relative lower stacking faults energy of the steel and the twinning mechanism during the deformation.
出处
《江西师范大学学报（自然科学版）》
CAS
北大核心
2017年第1期62-66,共5页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
江西省科技厅项目(20151BDH80082)
中国博士后科学基金(2015M581608)资助项目
关键词
超细晶TWIP钢
大变形轧制
退火
组织
性能
ultrafine-grained TWIP steel
large deformation rolling
annealing treatment
microstructures
properties
