锻压技术

基于加工图技术的铸态TB6钛合金锻造工艺优化

英文标题：Optimization of high-temperature alloy forging process of TB6 alloy casting by processing map

分类号：V252；TG146.2

出版年,卷(期):页码：2010,35(3):11-15

摘要：

在Thermecmaster-Z型热模拟实验机上对铸态TB6钛合金在800～1150 ℃、0.001～10 s^-1变形参数范围内进行了等温恒应变速率压缩实验，根据实验数据采用基于Murty准则的加工图技术对该合金的锻造工艺进行了优化，并结合显微组织观察研究了该合金的变形机制。结果表明，在低温区的较佳变形参数为800～950 ℃、0.001～0.01 s^-1，其变形机制为大晶粒超塑性；在高温区的较佳变形参数为1020～1080 ℃、0.001～0.006 s^-1，其变形机制为动态再结晶。失稳区出现在800～890 ℃、0.01～10 s^-1的低温区和975～1120 ℃、3.162～10 s^-1的高温区域，在流变失稳区会出现晶界裂纹。

The isothermal and constant strain rate compression tests of TB6 alloy casting were conducted in the range of 800-1150 ℃ and 0.001-10 s^-1 by Thermecmaster-Z simulator. According to the experimental data, the alloy forging process was optimized by means of processing map technology based on Murty criterion，and micro\|deformation mechanisms was investigated combined with microstructure observation. The results show that at low deformation temperature, the feasible deformation conditions are 800-950 ℃, 0.001-0.01 s^-1 with the deformation mechanism of large grain superplasticity. The feasible deformation conditions at high deformation temperature are 1020-1080 ℃, 0.001-0.0056 s^-1 with the deformation mechanism of dynamic recrystallization. The region of flow instability occurs in the area of low deformation temperature with 800-890 ℃, 0.01-10 s^-1 and of high deformation temperature with 975-1120 ℃, 3.162-10 s^-1. The grain boundary crack appears in the region of flow instability.

基金项目：

国家重点基础研究发展计划资助（2007CB613803）；航空科学基金（2009ZE56014）；江西省自然科学基金（2008GZC0041）；江西省教育厅科技项目（GJJ08203）；江西省研究生创新专项资金项目（YC08A085）；南昌航空大学研究生科技创新基金资助项目（YC2007001）

参考文献：

［1］段传宝.国内外钛工业发展状况概述[J].上海钢研，2003，（1）：39-42.
［2］鲍如强，黄旭，黄利军，等. Ti1023的变形机制及加工图[J]. 稀有金属材料与工程, 2005, 34(10)：522-526.
［3］赵雪盈,郭鸿镇，姚泽坤，等.Ti1023合金超塑性压缩时的流动应力及显微组织[J].上海金属，2005，27(5)：26-30.
［4］Prasad Y V R K, Gegel H L,Doraivelu S M,et al.Modeling of dynamic material behavior in hot deformation: forging of Ti6242[J]. Metalurgy Transaction A, 1984, 15A(10): 1883-1892.
［5］Prasad Y V R K. Authors reply: Dynamic materials model: Basis and principles[J]. Metallurgical and Materials Transactions A, 1996, 27A(1):235-247.
［6］Prasad Y V R K. Recent advances in the science of mechanical processing[J]. Indian Journal of Technology, 1990,4:435-451.
［7］Prasad Y V R K, Seshacharyulu T. Modelling of hot deformation for microstructural contral[J]. International Materials Reviews,1998, 43（6）: 243-252.
［8］Prasad Y V R K, Sastry D H. Processing maps for hot working of a P/M iron aluminide alloy[J]. Intermetallics, 2000, 8: 1067-1074.
［9］Narayana Murty S V S, Nageswara Rao B. On the hot working characteristics of INCONEL alloy MA754 using processing maps[J]. Scandinavian Journal of Metallurgy, 2000, 29: 146-150.
［10］Narayana Murty S V S, Nageswara Rao B. On the hot working characteristics of 6061Al-SiC and 6061Al2O3 particulate reinforced metal matrix composites[J]. Composites Science and Technology, 2003, 63:119-135.
［11］Narayana Murty S V S, Nageswara Rao B. Development and validation of a processing map for AFNOR 7020 aluminium alloy[J].Materials Science and Technology, 2004, 20:772-782.
［12］Spigarelli S, Cerri E. An analysis of hot formability of the 6061+20%Al2O3 composite by means of different stability criteria[J]. Materials Science and Engineering A, 2002,A327:144-154.
［13］鲁世强，李鑫，王克鲁，等.基于动态材料模型的材料热加工工艺优化方法[J].中国有色金属学报，2007，17(6)：890-896.
［14］鲍如强，黄旭，曹春晓，等.加工图在钛合金中的应用[J].材料导报，2004，18(7)：26-29.

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