摘要
在变形温度为750~850℃、应变速率为0.01~1 s^(-1)条件下,通过MMS-200型热模拟试验机研究了TC4钛合金的热变形行为,建立了应变补偿型Arrhenius本构方程。基于该本构方程,进行850℃下钛合金热冲压的数值模拟和试制,并对热冲压成形的帽形梁不同区域进行了力学性能测试和微观组织表征。结果表明:TC4钛合金的流变应力主要受到加工硬化和动态再结晶的影响,使得TC4钛合金具有负温度敏感性和正应变速率敏感性;建立的Arrhenius本构方程的相关系数R值为0.981,平均绝对相对误差e AARE为4.84%,证明建立的本构方程具有优良的预测能力。热冲压得到的帽形梁经过时效热处理后,各区域的屈服强度达到1000 MPa,抗拉强度超过1060 MPa,验证了TC4钛合金热冲压工艺的可行性。
The hot deformation behavior of TC4 titanium alloy was investigated using MMS-200 hot simulation testing machine under the conditions of deformation temperature of 750-850℃ and strain rate of 0.01-1 s^(-1).A strain-compensated Arrhenius constitutive equation was established.Based on the constitutive equation,numerical simulation and trial production of hot stamping at 850℃were carried out.The mechanical property tests and microstructural characterization were performed in different areas of the hot-stamped hat-shaped beam.The results show that the flow stress of TC4 titanium alloy is primarily influenced by work hardening and dynamic recrystallization,which makes the TC4 titanium alloy have negative temperature sensitivity and positive strain rate sensitivity.The correlation coefficient R of the established Arrhenius constitutive equation is 0.981,and the mean absolute relative error e AARE is 4.84%,demonstrating the excellent predictive capability of the established constitutive equation.After aging heat treatment,the yield strength of each region of the hot-stamped hat-shaped beam reaches 1000 MPa,and the tensile strength exceeds 1060 MPa,verifying the feasibility of the hot stamping process for TC4 titanium alloy.
作者
吕俊锦
魏鹏飞
胡志力
L Jun-jin;WEI Peng-fei;HU Zhi-li(Hubei Longzhong Laboratory,Xiangyang 441000,China;Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China;Hubei Collaborative Innovation Center for Auto Parts Technology,Wuhan University of Technology,Wuhan 430070,China)
出处
《塑性工程学报》
北大核心
2025年第7期33-42,共10页
Journal of Plasticity Engineering
基金
国家重点研发计划(2023YFB3307600)
国家自然科学基金资助项目(52075400)
湖北省自然科学基金资助项目(2023AFA069)。
关键词
TC4钛合金
热变形行为
本构模型
热冲压
TC4 titanium alloy
hot deformation behavior
constitutive model
hot stamping
