工程科学学报2016，Vol.38Issue(8)：1115-1122,8.DOI:10.13374/j.issn2095-9389.2016.08.010
TMCP工艺对Si--Mn系贝氏体钢组织与性能的影响
Effect of TMCP on the microstructure and mechanical properties of Si--Mn series bainitic steel
摘要
Abstract
The effects of two different thermomechanical control processes ( TMCP) including medium temperature slow cooling and medium temperature isothermal treatment after rolling on the microstructure and mechanical properties of Si-Mn series bainitic steel were investigated in this paper. The mechanical properties of the steel were studied by a tensile testing machine, the microstruc-ture was characterized by means of scanning electron microscopy and electron backscatter diffraction, and the amount of retained austenite in the steel was determined by X-ray diffraction analysis. The results show that, as the starting slow cooling temperature after rolling rises, the tensile strength, hardness and tensile strain hardening exponent n increase, the elongation rate and the impact tough-ness decrease, and the yield-strength ratio decreases first and then increases. When the isothermal time after rolling extends, the tensile strength and the yield-strength ratio of the steel first decrease and then increase, but the elongation and the impact toughness have a reverse trend. Compared with the isothermal regime, the continuous slow cooling can get better comprehensive mechanical prop-erties, the product of tensile strength and elongation is higher, and the elongation is 20% higher than that of the former.关键词
贝氏体钢/热机械处理/显微组织/力学性能Key words
bainitic steels/thermomechanical treatment/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
李明保,胡水平..TMCP工艺对Si--Mn系贝氏体钢组织与性能的影响[J].工程科学学报,2016,38(8):1115-1122,8.基金项目
国家自然科学基金资助项目(51274036) （51274036）
