在Gleeble-1500热模拟机上进行了Ti6213合金热模拟压缩试验,变形温度范围为800-1050℃,应变速率范围为0.001-10 s-1,最大变形量为60%,并根据动态材料模型建立了加工图.结果表明,合金在高温变形时主要有2个合适的加工区域,一个是变形温度800-950℃,应变速率0.01 s-1以下区域;另一个在相变温度以下40℃内,应变速率10 s-1以上区域.在900-930℃和0.001 s-1的变形条件下,出现耗散率峰值为65%,高m值,S形应力和应变速率对数曲线的现象,合金表现出超塑特性.拉伸实验进一步表明,延伸率可达512%,组织为两相混合组织.另外,合金在800-930℃和大于0.01 s-1的条件下出现集中变形带,表现为局部流变特征.
参考文献
[1] | 陈军,赵永庆,常辉.中国船用钛合金的研究和发展[J].材料导报,2005(06):67-70. |
[2] | 曾卫东;周义刚;舒滢.基于加工图的Ti40阻燃钛合金热变形机理研究[J].稀有金属材料与工程,2005(10):592-598. |
[3] | O. Sivakesavam;Y.V.R.K. Prasad .Hot deformation behaviour of as-cast Mg-2Zn-1Mn alloy in compression: a study with processing map[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):118-124. |
[4] | T. Seshacharyulu;S. C. Medeiros;W. G. Frazier;Y. V. R. K. Prasad .Hot working of commercial Ti-6Al-4V with an equiaxed α-β microstructure: materials modeling considerations[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):184-194. |
[5] | Prasad Y V R K;Seshacharyudu T.Modelling of hot deformation for microstructural control[J].International Materials Reviews,1998(44):243. |
[6] | Balasubrahmanyam VV.;Prasad YVRK. .Deformation behaviour of beta titanium alloy Ti-10V-4.5Fe-1.5Al in hot upset forging[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):150-158. |
[7] | Seshacharyulu T;Medeiros S C;Morgan J T;Malas J C;Frazier W G;Prasad Y V R K .Hot deformation mechanisms in ELI grade Ti-6Al-4V.[J].Scripta materialia,1999(3):283-288. |
[8] | 何景素;王燕文.金属的超塑性[M].北京:科学出版社,1986:149-153. |
[9] | 赵映辉,葛鹏,杨冠军,赵永庆,毛小南.Ti-1300合金锻造加工的热压缩模拟[J].稀有金属材料与工程,2009(03):550-553. |
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