北京科技大学学报Issue(3)：308-314,7.DOI:10.13374/j.issn1001-053x.2014.03.005
退火温度对超细晶中锰TRIP钢组织性能的影响
Effects of annealing temperature on the microstructure and mechanical proper-ties of ultrafine grained medium-manganese TRIP steel
摘要
Abstract
To study the feasibility of producing automobile steel from medium-manganese TRIP steel by continuous annealing processes, the effects of annealing temperature on the microstructure and mechanical properties of low-carbon medium-manganese steel were investigated on a heat treatment system CCT-AY-II for thin steel sheet at 590 to 710℃. The microstructure and components of the steel during annealing were characterized by scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction, and energy dispersive X-ray spectroscopy. The amount of retained austenite in the steel was determined by X-ray diffraction analysis. The mechanical properties of the steel were investigated by uniaxial tensile testing. Experimental results show that after hold-ing for 3 min, the amount of retained austenite first increases and then decreases with increasing annealing temperature. The elongation and the product of strength and elongation reach their maximum values of 21.3% and 28 GPa·% for the steel annealed at 650℃, respectively, and the tensile strength is 1330 MPa. Ultra-fine grain structures are obtained by recovering for the martensitic matrix and by twinning for retained austenite. It is believed that the high plasticity is provided by the TRIP effect of metastable austenite and ultra-fine grained ferrite or martensite together. A zig-zag shape appears on the true stress-strain curve. The work hardening exponent of the steel is much larger than that of traditional TRIP steel at the relatively stable stage.关键词
汽车材料/中锰钢/退火/微观结构/力学性能/加工硬化Key words
automobile materials/medium-manganese steel/annealing/microstructure/mechanical properties/work hardening分类
矿业与冶金引用本文复制引用
尹鸿祥,赵爱民,赵征志,程俊业,曾尚武,惠亚军..退火温度对超细晶中锰TRIP钢组织性能的影响[J].北京科技大学学报,2014,(3):308-314,7.基金项目
国家自然科学基金资助项目(50904006) （50904006）
中央高校基本科研业务费专项资金资助项目(FRF-TP-10-001A) （FRF-TP-10-001A）
教育部博士学科点专项科研基金资助项目(20110006110007) （20110006110007）
