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热轧温度对Ti-45Nb合金棒材微观组织及力学性能的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-09-13
对Ti-45Nb钛合金精锻棒材分别在750、800和850 ℃下进行热轧实验，并利用光学显微镜对试样的横向和纵向组织进行观察，对合金的室温强度和塑性指标进行测试。
热轧温度对Ti-45Nb合金棒材微观组织及力学性能的影响Influence of rolling temperature on microstructure and mechanical properties of Ti-45Nb alloy bars
对Ti-45Nb钛合金精锻棒材分别在750、800和850 ℃下进行热轧实验，并利用光学显微镜对试样的横向和纵向组织进行观察，对合金的室温强度和塑性指标进行测试。结果表明：在800 ℃温度下热轧时，合金均具有优良的室温强度和塑性，室温强度在420 MPa以上，室温塑性大于25%，显微组织为动态再结晶的细小等轴组织，且随着轧制温度升高，抗拉强度和塑性在800 ℃轧制时同时增高，在850 ℃时又同时降低。通过对成品丝材的组织和性能对比分析可知，750和800 ℃轧制的棒材加工到丝材，性能均满足标准要求，Ti-45Nb合金的最佳热轧温度可以确定为750～800 ℃。
The titanium alloy forging bars was hot-rolled at 750, 800 and 850 ℃, respectively, the sample longitudinal and horizontal microstructure were observed using an optical microscope, the strength and plasticity of the alloy was tested at room temperature. The results show that hot-rolled alloys under 800 ℃ have excellent strength and ductility at room temperature, the strength at room temperature is over 420 MPa, ductility at room temperature is over 25%, the microstructure consists of fine equiaxed dynamic recrystallization grains. With the rolling temperature rising, the tensile strength and ductility of the bars rolled at 800 ℃ increase, the tensile strength and ductility of the bars rolled at 850 ℃ decrease. Comparative analysis of microstructure and properties of wires, the mechanical properties of the wires made of the bars rolled at 750 ℃ and 800 ℃ can meet the standards. It can be determined that Ti-45Nb alloy optimum hot rolling temperature is 750~800 ℃.
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