基于Murty判据的粗片层状TA15钛合金β相区锻造工艺参数优化  

Optimization of Forging Processing Parameters in β Phase Field of Coarse Lamellar TA15 Titanium Alloy Based on Murty Criterion

作　　者：董显娟[1,2] 鲁世强[2] 王克鲁[2] 方军[2] 吴超[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《机械工程材料》2009年第7期67-71,共5页Materials For Mechanical Engineering

基　　金：江西省自然科学基金资助项目(2007GQC1575);江西省教育厅科技资助项目(GJJ08203)

摘　　要：对粗片层状TA15钛合金在Thermecmaster-Z型热模拟试验机上进行等温恒应变速率压缩试验，采用基于Murty判据的加工图技术研究了该合金在温度1000～1100℃、应变速率0．001～10s^-1参数范围内的微观变形机制，并优化出该合金的锻造工艺参数。结果表明：在β单相区变形时，TA15钛合金较佳的变形参数范围为1030-1075℃、0．001～0．03s^-1，以1050℃、0．001s^-1附近为最佳，其变形机制为β晶粒充分均匀的动态再结晶；失稳区变形参数范围为1000～1100℃、1．78-10S^-1，在该区出现了β晶粒的不均匀变形。Hot compression tests of TA15 titanium alloy with coarse lamellar microstructure were conducted using Thermecmastor-Z hot working simulator. Microstructural deformation mechanisms were investigated by means of processing map technology based on Murty criterion in the temperature range of 1 000- 1 100℃ and strain rate range of 0. 001 - 10 s^-1 , and the forging thermal parameters were optimized. The results show that in 13 phase field the desired deformation regions were in the range of 1 030- 1 075 ℃ and 0. 001- 0. 03 s^-1 with the deformation mechanism of full and uniform dynamic recrystallization, and the optimum deformation parameters were at 1 050℃ and 0. 001 s^-1. The regions of flow instability occurred in the temperature range of 1 000-1 100℃ and strain rate range of 1.78-10 s^-1 , and non-uniform deformation of 13 grains appeared in this range.

关 键 词：TA15钛合金 Murty判据 加工图 变形机制 

分 类 号：TG146.2[一般工业技术—材料科学与工程]