摘要
基于粉末热等静压近净成形技术,在930℃/120 MPa/3 h的条件下开展了TA7 ELI(超低间隙)高承压泵壳体的成形研究,通过两批次粒度存在差异的粉末(粉末表面为胞晶形貌,D_(50)为67μm、74μm)分析了制粉时的粒度波动对成形材料力学性能的影响,并结合有限元仿真手段开展了高承压泵壳体的粉末收缩规律研究。此外,根据高承压泵在液体火箭发动机中的实际服役情况,对近净成形的高承压泵毛坯进行解剖,分析了特征截面位置的显微组织及硬度分布情况。结果表明,粉末热等静压近净成形技术制备的TA7 ELI合金力学性能达到锻件水平,粉末粒度波动对合金力学性能无显著影响,高承压泵壳体的显微组织均匀,特征截面的硬度值波动小,壳体内部流道关键尺寸实测结果与模拟预测结果的最大偏差为5.37%。
TA7 ELI(extra low interstitial)high pressure pump shell was prepared by powder metallurgy nearnet shaping technology under the hot isostatic pressing parameters of 930℃/120 MPa/3 h.The effects of different batches of powder on the properties of TA7 ELI alloy were compared(surface morphology of the powder was cellular in shape,and their D_(50) values are 67μm and 74μm),and the powder shrinkage law of high pressure pump was studied using finite element method.The cutting of the formed high pressure pump shell was performed for dimensional analysis and microstructure observation.The results show that the mechanical properties of TA7 ELI alloy prepared by powder metallurgy is comparable to the properties of wrought alloy.The particle size deviation of two batches of powder shows no significant influence on tensile properties,the microstructure of high pressure pump shell is homogeneous,the hardness value of the characteristic section fluctuates little,and the maximum deviation between the measured results and the predicted results of the key dimensions of the flow channel inside the shell is 5.37%.
作者
卢正冠
蒋文山
张静
崔潇潇
尚学文
徐磊
LU Zhengguan;JIANG Wenshan;ZHANG Jing;CUI Xiaoxiao;SHANG Xuewen;XU Lei(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Beijing Aerospace Propulsion Institute,Beijing 100076,China;University of Science and Technology of China,Shenyang 110016,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第18期54-60,73,共8页
Aeronautical Manufacturing Technology
基金
国家科技重大专项(J2019–VII–0005–0145)
稳定支持基础研究领域青年团队计划(YSBR–025)。
关键词
粉末热等静压近净成形
TA7
ELI(超低间隙)
拉伸性能
解剖分析
有限元
粉末粒度
Powder metallurgy near-net shaping with hot isostatic pressing
TA7 ELI(extra low interstitial)
Tensile properties
Cutting analysis
Finite element method
Powder particle size
