基于响应面法的TA15钛合金显微组织预报和优化  

Prediction and optimization of TA15 titanium alloy microstructure based on response surface methodology

作　　者：李萍[1] 丁永根 姚彭彭 薛克敏[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]上海大众汽车有限公司宁波分公司,宁波315000

出　　处：《中国有色金属学报》2016年第5期1019-1026,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51175137);教育部新世纪优秀人才支持计划(NCET-13-0765)~~

摘　　要：对在不同参数下热变形后水冷的TA15合金进行800℃保温1 h的真空退火热处理,借助于电子背散射衍射(EBSD)技术,分析热变形参数对TA15合金退火显微组织的影响。针对TA15合金热加工工艺参数与显微组织特征参数之间高度复杂的非线性关系,提出利用响应面法建立二者之间的量化模型,给出表征工艺参数与显微组织特征参数之间的响应面函数。同时,对响应面模型进行多目标可视化优化,获得最优工艺参数范围:变形温度为950℃,应变速率为0.063~0.1 s^(-1),变形量为0.4~0.6时可以获得具有优异综合力学性能的三态组织;变形温度为1000℃,应变速率为0.1~0.316 s^(-1),变形量为0.2~0.45时可以获得具有高损伤容限性的片层组织。TA15 titanium alloy deformed at different parameterswasconducted heat treatment at 800℃and kept for1h, and at the same time the electron backscattered diffraction （EBSD） techniquewasapplied to analyzethe influence of thermal deformation parameters on the microstructure of annealed TA15 titanium alloy.As the result that the highly complex nonlinear relationship between process parameters and microstructure parameters of TA15 titanium alloy, a quantitative prediction modelwas builtbased on the response surface methodology （RSM）, the response surface function representation of process parameters and microstructure characteristic parameterswere obtained. In addition, the optimal process parameterswereobtainedby multi-objective visualization optimization.The results show that it can be obtained tri-modal microstructure with excellent mechanical properties at 950℃,strain ratesof0.063？0.1s？1,the amount of deformationof0.4？0.6. However, it can be obtainedlamellar structure withhigh damage tolerance at 1000℃, strain ratesof0.1？0.316s？1,the amount of deformationof0.2？0.45.

关 键 词：TA15合金 退火热处理 响应面法 优化 三态组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]