火箭推进

采用激光选区熔化成形技术(selective laser melting,SLM)制备了不同成形角度的TA7钛合金,分析了成形角度以及热处理对成形合金显微组织、织构及力学性能的影响。结果表明:由于SLM成形技术凝固较快的特点,导致成形TA7钛合金的显微组织受成形角度影响较为显著,为平行于成形方向的柱状β晶粒,晶内均为快速凝固形成的生成α'马氏体; 成形合金存在织构,成形角度为30°时,织构的取向密度指数达到最高的15.05,Schmid因子为4.35; 在显微组织与织构差异的影响下,成形合金的性能具有显著的各向异性,随着成形角度的增加,合金的强度逐渐升高,塑性呈现降低的趋势; 经过热处理后,合金的显微组织转变为等轴晶,织构显著弱化,合金的力学性能实现了各向同性。基于上述研究,采用激光选区熔化成形技术可成形具有复杂流道结构的TA7钛合金级间壳体构件。

Selective laser melting(SLM)was used to produce TA7 titanium alloy with different forming angles. The effects of forming angles and heat treatment on the microstructure, texture and mechanical properties of the alloy were analyzed. The results show that the microstructure of the formed TA7 titanium alloy was significantly affected by the forming angle due to the fast solidification of SLM forming technology. The columnar β grains were parallel to the forming direction, and the α' martensite was formed by rapid solidification in the crystals. When the forming angle was 30°, the orientation density index of the texture reached the highest 15.05 and Schmid factor was 4.35. Under the influence of microstructure and texture differences, the properties of the alloy had significant anisotropy. With the increase of forming angle, the strength of the alloy increased gradually, and the plasticity of the alloy decreased. After heat treatment, the microstructure of the alloy changed to equiaxed crystal, the texture was weakened significantly, and the mechanical properties of the alloy achieved isotropy. Based on the above research, the TA7 titanium alloy interstage shell with complex runner structure was fabricated by laser selective melting forming technology.

引言
1 实验材料与方法
2 结果与讨论
3 结论

$表1 TA7钛合金粉末各元素质量分数<br/>Tab.1 Mass fraction for different element of TA7 titanium alloy powder 单位:%$

表1 TA7钛合金粉末各元素质量分数
Tab.1 Mass fraction for different element of TA7 titanium alloy powder 单位:%

图1 TA7钛合金粉末形貌<br/>Fig.1 Powder morphology of TA7 titanium alloy

图1 TA7钛合金粉末形貌
Fig.1 Powder morphology of TA7 titanium alloy

表2 SLM 制备TA7 钛合金试样的成形工艺参数<br/>Tab.2 Processing parameters for TA7 titanium alloy fabricated by SLM

表2 SLM 制备TA7 钛合金试样的成形工艺参数
Tab.2 Processing parameters for TA7 titanium alloy fabricated by SLM

图2 不同成形角度的TA7钛合金试样示意图<br/>Fig.2 Schematic diagram of TA7 titanium alloy samples at different forming angles

图2 不同成形角度的TA7钛合金试样示意图
Fig.2 Schematic diagram of TA7 titanium alloy samples at different forming angles

图3 不同成形角度的TA7钛合金试样的显微组织<br/>Fig.3 Microstructure of TA7 titanium alloy samples at different forming angles

图3 不同成形角度的TA7钛合金试样的显微组织
Fig.3 Microstructure of TA7 titanium alloy samples at different forming angles

图4 不同成形角度的TA7钛合金试样的XRD图谱<br/>Fig.4 XRD patterns of TA7 titanium alloy samples at different forming angles

图4 不同成形角度的TA7钛合金试样的XRD图谱
Fig.4 XRD patterns of TA7 titanium alloy samples at different forming angles

图5 不同成形角度TA7钛合金的反极图<br/>Fig.5 Reverse polarity of TA7 titanium alloy at different forming angles

图5 不同成形角度TA7钛合金的反极图
Fig.5 Reverse polarity of TA7 titanium alloy at different forming angles

表3 不同成形角度的TA7钛合金室温拉伸性能<br/>Tab.3 Tensile properties of TA7 titanium alloy at room temperature at different forming angles

表3 不同成形角度的TA7钛合金室温拉伸性能
Tab.3 Tensile properties of TA7 titanium alloy at room temperature at different forming angles

图6 不同成形角度TA7钛合金拉伸示意图<br/>Fig.6 Tensile diagram of TA7 titanium alloy at different forming angles

图6 不同成形角度TA7钛合金拉伸示意图
Fig.6 Tensile diagram of TA7 titanium alloy at different forming angles

图7 SLM成形TA7钛合金热处理前后IPF图<br/>Fig.7 IPF of TA7 titanium alloy before and after heat treatment at different forming angles

图7 SLM成形TA7钛合金热处理前后IPF图
Fig.7 IPF of TA7 titanium alloy before and after heat treatment at different forming angles

图8 热处理后SLM成形TA7钛合金的极图<br/>Fig.8 Polar images of TA7 titanium alloy with different forming angles after heat treatment

图8 热处理后SLM成形TA7钛合金的极图
Fig.8 Polar images of TA7 titanium alloy with different forming angles after heat treatment

图9 热处理后不同成形角度的TA7钛合金试样室温拉伸性能<br/>Fig.9 Tensile properties at room temperature of TA7 titanium alloy samples with different forming angles after heat treatment

图9 热处理后不同成形角度的TA7钛合金试样室温拉伸性能
Fig.9 Tensile properties at room temperature of TA7 titanium alloy samples with different forming angles after heat treatment

图10 激光增材制造TA7钛合金级间壳体构件<br/>Fig.10 TA7 titanium alloy component fabricated by additive manufacturing

图10 激光增材制造TA7钛合金级间壳体构件
Fig.10 TA7 titanium alloy component fabricated by additive manufacturing

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备注

引言

1 实验材料与方法

2 结果与讨论

3 结论

期刊信息