20CrMnTi钢的温热变形行为及其数学建模  

The Warm-Hot Deformation Behavior and Modeling of 20CrMnTi Steel

作　　者：杨慧[1] 李振红[1] 张质良[1] 

机构地区：[1]上海交通大学塑性成形工程系,上海200030

出　　处：《上海交通大学学报》2005年第11期1799-1802,共4页Journal of Shanghai Jiaotong University

基　　金：上海汽车工业科技发展基金项目

摘　　要：利用热模拟试验研究了20CrMnTi钢在温度为1123～1 273 K,变形速率为0.01～20 s-1条件下的温热变形行为,并对其变化规律进行系统分析.以流动应力σ为目标函数,研究了主要热力参数对目标函数的影响.基于蠕变理论和统计分析建立了两种适用于20CrMnTi钢温热锻的流动应力数学模型,为20CrMnTi温热成形数值模拟和热力参数的合理控制提供了依据.The warm-hot deformation behavior of 20CrMnTi steel was studied with hot compression tests at 1 123-1 273 K and strain rate of 0.1-20 s^-1. Taking the flow stress as an objective function, the influences of main forging parameters imposing on the flow stress were analyzed systematically in the temperature range of hot-warm forging. Based on creep theory and mathematic theory of statistics, mathematical models of flow stress were obtained. The research and results provide a scientific basis for the numerical simulation of forging process, rational choice and control of thermal parameters of 20CrMnTi forging processes.

关 键 词：20CRMNTI钢 温热变形 流动应力 热模拟试验 

分 类 号：TG312[金属学及工艺—金属压力加工]