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Effect of isothermal forging strain rate on microstructures and mechanical properties of BT25y titanium alloy

机译：等温锻造应变速率对BT25y钛合金组织和力学性能的影响

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摘要

In order to confirm the optimal isothermal forging process for BT25y alloy, the effect of strain rate on the microstructure and mechanical properties was studied. Quantitative relationships between micro-structure characteristics and mechanical properties were obtained. Results showed that as the strain rate decreased, the lamellar a coarsened, the β grain boundary connected by small recrystallized grains disappeared, and the microstructure became much more uniform. Tensile strength for the three processes all maintained at a high level, but the elongation tended to first increase and then decrease with dropping strain rate. The tensile fracture changed from quasi-cleavage fracture to complete ductile fracture, and finally transformed into a mixture of ductile fracture and brittle fracture at lower strain rate. Fracture toughness improved with increased strain rate, but the thermal stability deteriorated gradually.
机译：为了确定BT25y合金的最佳等温锻造工艺，研究了应变速率对组织和力学性能的影响。获得了微观结构特征和力学性能之间的定量关系。结果表明，随着应变率的降低，层状组织粗大化，由小的再结晶晶粒连接的β晶界消失，微观结构变得更加均匀。这三个过程的拉伸强度均保持在较高水平，但伸长率倾向于随应变率的下降先增大后减小。拉伸断裂从准断裂断裂转变为完全的延性断裂，最后以较低的应变率转变为延性断裂和脆性断裂的混合物。断裂韧性随着应变率的增加而提高，但热稳定性逐渐下降。

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