BT20钛合金热变形流变应力的预测模型  

Predictive Models for Flow Stress of BT20 Titanium Alloy

作　　者：李雄[1] 庞克昌[1] 计波[1] 汪宏斌[2] 

机构地区：[1]宝山钢铁股份有限公司特殊钢分公司技术中心,上海200940 [2]上海大学材料科学与工程学院,上海200072

出　　处：《机械工程材料》2007年第7期54-56,共3页Materials For Mechanical Engineering

摘　　要：对现有的流变应力模型进行了分析,针对BT20钛合金流变应力的特性,提出了一个新的计算热变形条件下钛合金流变应力的模型。该模型考虑了温度和应变速率的影响,能描述热变形过程中加工硬化阶段和加工软化阶段的流变应力;并建立了峰值应变、峰值应力、稳态应力和变形参量之间关系的模型。结果表明:这些模型预测结果与试验结果吻合,具有较好的精度。The existing flow stress models were analyzed. Aiming at the characteristics of flow stress of BT20 titanium alloy, a mathematical model has been put forward to determine flow stress under hot working condition. The propounded model can describe the flow stresses involved in the work hardening and work softening processes due to dynamic recrystallization and recovery, as well as the effect of temperature and strain rate. The models between peak strain, peak stress, steady state stress and deformation parameters have been also established, respectively. The preciseness of calculated results using these models is good to compare with the experimentai results.

关 键 词：钛合金 流变应力 应变速率 变形温度 

分 类 号：TG111.7[金属学及工艺—物理冶金]