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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Annealing Temperature on Microstructure and Mechanical Properties of Hot Swaged cp-Ti Produced by Investment Casting
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Effect of Annealing Temperature on Microstructure and Mechanical Properties of Hot Swaged cp-Ti Produced by Investment Casting

机译：退火温度对熔模铸造热锻cp-Ti组织和力学性能的影响

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摘要

The purpose of this study is to evaluate the influence of hot swaging (SW) and annealing treatment on microstructure and mechanical properties of commercially pure titanium (grade 4) produced by investment casting. During SW at 700 °C, the diameter of the cast titanium bars was reduced from 25 to 8.5 mm in 14 steps. After SW, material was annealed for 1 h at 500, 700, or 870 °C. The as-cast samples showed a typical microstructure consisting of a variety of α-morphologies, while the hot swaged samples exhibited a kinked lamellar microstructure. Annealing at 500 °C did not significantly change this microstructure, while annealing at both 700 and 870 °C led to recrystallization and formation of equiaxed microstructures. The cast bars exhibited a typical hard α-layer in near-surface regions with maximum depth and maximum hardness of 720 μm and 660 HV0.5, respectively. Due to SW, the tensile strength of the as-cast material drastically increased from 605 to 895 MPa. Annealing at 500 °C decreased this tensile strength slightly from 895 to 865 MPa while annealing at 700 °C led to a further pronounced drop in tensile strength from 865 to 710 MPa. No additional decrease in tensile strength was observed by increasing the annealing temperature from 700 to 870 °C. The tensile ductility of the as-cast and hot swaged samples was approximately the same in the range of 0.05 to 0.11, while the annealed samples showed values in the range of 0.25 to 0.53. In addition, the as-cast and hot swaged samples revealed a brittle cleavage fracture surfaces. However, the annealed samples showed a transgranular ductile fracture with formation of dimples.
机译：这项研究的目的是评估热锻（SW）和退火处理对熔模铸造生产的商业纯钛（4级）的显微组织和力学性能的影响。在700°C的SW中，铸造的钛棒的直径以14个步骤从25毫米减小到8.5毫米。 SW之后，材料在500、700或870°C退火1小时。铸态样品显示出典型的微观结构，其由多种α形态组成，而热锻后的样品表现出了扭结的层状微观结构。在500°C退火不会显着改变这种微观结构，而在700和870°C退火则导致重结晶和等轴微观结构的形成。铸钢棒在近表面区域表现出典型的硬质α层，最大深度和最大硬度分别为720μm和660 HV0.5。由于SW，铸态材料的拉伸强度从605 MPa急剧增加到895 MPa。在500°C退火时，该拉伸强度从895 MPa轻微降低到865 MPa，而在700°C退火时，拉伸强度从865进一步下降到710 MPa。通过将退火温度从700升高至870°C，未观察到拉伸强度的进一步降低。铸态和热锻样品的拉伸延展性在0.05至0.11的范围内大致相同，而退火后的样品在0.25至0.53的范围内。另外，铸态和热锻的样品显示出脆性的断裂断裂面。然而，退火后的样品显示出了横穿颗粒的韧性断裂并形成了酒窝。

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