Effect of heat treatment on the microstructure and properties of TiBw reinforced high-temperature titanium matrix composite
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摘要: 采用扫描电镜、电子万能材料试验机研究了整体锻造成形的TiBw增强高温钛基复合材料锻件的组织和性能，以及不同热处理工艺对锻件组织和性能的影响。结果表明：锻件组织为双态组织，在650 ℃时表现出优异的高温性能，但在700 ℃时其强度出现了大幅下降。对锻件进行了不同的热处理，发现随着固溶温度的升高，α相含量和尺寸逐渐降低。另外，其拉伸强度随着固溶温度的升高而升高，但其塑性则会降低。当固溶温度为1030 ℃时，可以得到等轴α相含量为18.58%的双态组织，此时高温性能最为优异。其屈服强度为514.0 MPa，极限抗拉强度最高为594.0 MPa，延伸率为13.9%。
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关键词:
- TiBw增强高温钛基复合材料 /
- 固溶温度 /
- 微观组织 /
- 力学性能
Abstract: The microstructure and properties of TiBw reinforced high-temperature titanium matrix composite forgings formed by integral forging and the effects of different heat treatment processes on the microstructure and properties of forgings were studied by scanning electron microscope and electronic universal material testing machine. The results show that the microstructure of the forgings is bimodal structure, which shows excellent high-temperature performance at 650 ℃, but its strength decreases significantly at 700 ℃. Different heat treatments were performed on the forgings, and it was found that the content and size of the α phase gradually decreased with the increase of the solution temperature. In addition, its tensile strength increases with increasing solid solution temperature, but its plasticity decreases. When the solid solution temperature is 1030 ℃, a bimodal structure with an equiaxed α-phase content of 18.58% can be obtained, and the high-temperature performance is the best. The yield strength is 514.0 MPa, the ultimate tensile strength is 594.0 MPa, and the elongation is 13.9%. -
图 1 TiBw/Ti复合材料零件及热成型工艺
Figure 1. Parts of TiBw/Ti composite material and thermoforming process diagram
图 4 TiBw/Ti锻件经热处理后的微观组织
Figure 4. Microstructure of TiBw/Ti forgings after heat treatment
(a)(d) 970 ℃/0.5 h+650 ℃/6 h; (b)(e) 1000 ℃/0.5 h+650 ℃/6 h; (c)(f) 1030 ℃/0.5 h+650 ℃/6 h
图 5 复合材料锻件经热处理后的力学性能
Figure 5. Mechanical properties of composite forgings after heat treatment
表 1 锻后零件的三种热处理工艺参数
Table 1. Three heat treatment parameters of forged parts
样品 固溶温度/℃ 保温时间/h 冷却方式 时效温度/℃ 时效时间/h 冷却方式 HT1 970 0.5 空冷 650 6 空冷 HT2 1000 0.5 空冷 650 6 空冷 HT3 1030 0.5 空冷 650 6 空冷 
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