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中文摘要：
热 rolledSi-Mn 旅行钢的机械性质上的 austempering 的效果被学习。转变的机制导致了粘性(旅行) 通过微观结构的考试和标本的机械性质被讨论。结果证明钢的微观结构由多角形的肥沃的、小粒的巴菌体和稳定的保留的奥氏体的重要数量组成。标本为 TRIP 效果展出优秀 meclianical 性质。等温的成立时间 foraustempering 影响保留的奥氏体，象张力的力量那样的机械性质，全部的延伸和力量韧性平衡的稳定性到达他们的最佳的价值(776 MPa， 33percent 和 25608 Mpa 百分比，分别地) 当标本为 25 min 在 400 deg C 被保持时。
英文摘要：
The effect of austempering on the mechanical properties of the hot rolled Si- Mn TRIP steels was studied. The mechanism of transformation induced plasticity （TRIP） was discussed through the examination of the microstructure and the mechanical properties of the specimens. The results stow that the microstructures of the steels were comprised of polygonal ferrite, granular bainite and a significant amount of stable retained austenite. The specimen exhibits excellent mechanical properties for the TRIP effect. Isothermal holding time for austempering affects the stability of retained austenite. The mechanical properties such as tensile strength, total elongation and strength ductility balance reach their optimal values （ 776 MPa , 33% and 25608 MPa% , respectively） when the specimen is held at 400℃ for 25 min.
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