熔铸态和锻态TiBw/TA15复合材料热变形行为研究

Research on Thermal Deformation Behavior of As-cast and Forged TiBw/TA15 Composite

采用Gleeble-3800型热模拟试验机对熔铸态和锻态TiBw/TA15复合材料进行高温压缩变形试验,研究不同状态TiBw/TA15复合材料在变形量70%、变形温度900~1150℃、应变速率0.01~10 s^(-1)条件下的热变形行为,建立热加工图,并分析该复合材料在热变形过程中的组织性能演变规律。结果表明,熔铸态TiBw/TA15复合材料的热加工工艺窗口为温度900~1150℃,应变速率2.72~10 s^(-1);温度1000~1100℃,应变速率0.01~0.03 s^(-1);温度1075~1130℃,应变速率0.01~0.13 s^(-1)。锻态TiBw/TA15复合材料的热加工工艺窗口为温度900~975℃,应变速率0.37~10 s^(-1);温度960~1025℃,应变速率0.01~0.37 s^(-1);温度1025~1150℃,应变速率0.01~10 s^(-1)。通过对比发现,锻态TiBw/TA15复合材料的热加工工艺窗口宽,热变形加工性能优于熔铸态。

Hot compression deformation test of as-cast and forged TiBw/TA15 composite was carried out by Gleeble-3800 thermal simulation machine,the thermal deformation behavior of TiBw/TA15 composite in different states was studied under the conditions of deformation amount of 70%,deformation temperature of 900~1150 ℃ and deformation rate of 0.01~10 s^(-1),the microstructure evolution and properties of the composite during the thermal deformation process were analyzed.The results show that the hot working window of TiBw/TA15 composite as-cast is 900~1150 ℃,2.72~10 s^(-1);1000~1100 ℃,0.01~0.03 s^(-1);1075~1130 ℃,0.01~0.13 s^(-1).The hot working window of TiBw/TA15 composite as-forged is 900~975 ℃,0.37~10 s^(-1);960~1025 ℃,0.01~0.37 s^(-1);1025~1150 ℃,0.01~10 s^(-1).Through comparison it is found that the hot working window of TiBw/TA15 composite as-forged is wide and the hot workability is better than that of as-cast.