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《China Mechanical Engineering》 2015-18
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Research on Near-Net-Shaping Ti6Al4V Alloy Parts under Two-Step Hot Isostatic Pressing

Huang Jun;Xue Pengju;Wei Qingson;Shi Yusheng;State Key Laboratory of Material Process and Die and Mould Technology,Huazhong University of Science and Technology;  
Monolithic superalloy parts shaped by hot isostatic pressing may exist low density region which will cause uneven overall performance.This paper proposed a two-step hot isostatic pressing method:at low temperature and pressure original parts were shaped without connected pores from alloy powder,then the low density regions were densed at an appropriate temperature and pressure after removing capsule and shape-control mold,which could guarantee uniform performance.Taking Ti6Al4 Vpowder material as an example,two-step HIP parameters were determined by combining finite element simulation and experimental tests,with which bladed disk parts were made.The SEM results show that:it is fine and homogeneous stripα+βphase in the parts and there is no prior particle boundary or connected pores,which contribute to the good performance of parts.The fracture morphology analysis shows that:the powder particles are metallurgically bonded firmly and no longer the crack source given appropriate processing parameters.Tensile strength of two-step HIP parts is slightly better than that of conventional HIP and as same as the forging's.
【Fund】: 国家自然科学基金资助项目(51375188);; 国家科技重大专项(2009ZX04005-041-03)
【CateGory Index】: TF124
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