中文摘要：

分析相变诱发塑性钢板因塑性变形而引起的非弹性回复行为。通过相变诱发塑性钢板在不同应变水平下单向拉伸试验,对变形前后的微观组织进行扫描电镜金相观察,用位错理论对非弹性回复的机理进行分析,重点对相变诱发塑性钢板卸载后的应变回复的组成及其随塑性应变的变化规律进行详细的讨论,通过试验数据的拟合建立弹性模量模型。将该模型引入有限元软件中进行U形件的回弹仿真,并进行试验验证。研究表明：相变产物马氏体引起微观结构改变,导致相变诱发塑性钢板具有显著的非弹性回复行为;相变诱发塑性钢板卸载后的应变回复由弹性部分和非弹性部分组成,其中非弹性回复所占比例最高可达20%;采用建立的弹性模量模型的回弹仿真结果与试验值吻合较好。

英文摘要：

Inelastic recovery behavior introduced by plastic deformation is analyzed for transformation-induced plasticity steels.By uniaxial tension testing of transformation-induced plasticity steels under different strain levels,microstructures before and after deformation are detected by scanning electron microscope.The mechanism of inelastic recovery is analyzed with the dislocation theory.The emphasis is put on the composition of the inelastic strain recovery of transformation-induced plasticity（TRIP） steel during unloading and its variation regulation with the plastic strain.An elastic modulus model is built through the fitting of test data.Then the model is introduced into finite element software to simulate the U-channel springback and lab springback experiments are carried out to verify the simulation precision.It is shown that the transformed martensite introducing the microstructure disturb gives the prominent inelastic recovery to TRIP steels.The total strain recovery is composed by the elastic strain recovery and the inelastic strain recovery,among which the percentage of the inelastic strain recovery can reach 20%.The springback simulation result calculated by the proposed elastic modulus model is consistent with the experimental result.