The densification of powders by power-law creep during hot isostatic pressing |
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| Affiliation: | 1. University of South Bohemia in ?eské Budějovice, Faculty of Health and Social Studies, Department of Nursing and Midwifery, ?eské Budějovice, Czech Republic;2. University of South Bohemia in ?eské Budějovice, Faculty of Health and Social Studies, Department of Social Work, ?eské Budějovice, Czech Republic;1. Department of Pathophysiology, West China School of Preclinical and Forrensic Medicine, Sichuan University, China;2. State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China;3. School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou 325035, China;4. Department of Clinical Laboratory, Shanghai Public Health Clinical Center, Shanghai 201508, China;5. Shanghai Key Laboratory of Tuberculosis, Shanghai Pulmonary Hospital, Medical School, Tongji University, Shanghai, China;6. Tuberculosis Clinic, Chaoyang Distric Center for Disease Control and Prevention, Chaoyang Distric, Beijing, China;1. Department of Mechanical Engineering, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China;2. Department of Mechanical Engineering, Wuhan Institute of Technology, Wuhan, Hubei Province 430070, China;3. Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, United States;1. Department of Materials, NRCN, P.O. Box 9001, Beer-Sheva 84190, Israel;2. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 8410501, Israel;3. Physics Department, NRCN, P.O. Box 9001, Beer-Sheva 84190, Israel;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India;2. Department of Mechanical Engineering, BMS College of Engineering, Bangalore 560019, India |
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| Abstract: | Hot isostatic pressing (HIP) is potentially a cost-effective and efficient process for the manufacture of high quality metal components from powders. The densification of the powder during HIP proceeds in stages marked by changes in the geometry of the pores and by the dominance of different densification mechanisms. When the density is high and the pores are isolated and roughly spherical, the densification rate under a compressive load due to creep can be approximated by the densification rate of a sphere of creeping material containing a single, centered void. The densification rates predicted by such a model are significantly increased by small deviations of the load from purely hydrostatic compression. Thus, a careful account of the coupling between the hydrostatic and deviatoric stresses is important in the accurate modelling of the process and the design of an efficient HIP cycle; this can be achieved through the introduction of an approximate strain rate potential for the porous body. |
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