烧结方法对CP-Ti粉末烧结块显微组织和力学性能的影响.pdfVIP

Trans. Nonferrous Met. Soc. China 24(2014) s59−s67 Effects of various sintering methods on microstructure and mechanical properties of CP-Ti powder consolidations 1, 2 1 1 3 3 1 Je-ha SHON , Jong-moon PARK , Kyeong-sik CHO , Jae-keun HONG , Nho-kwang PARK , Myung-hoon OH 1. Department of Advanced Materials Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 730-701, Korea; 2. Advanced Technology Team, Pohang Institute of Metal Industry Advancement, Pohang, Gyeongbuk 790-834, Korea; 3. Titanium Department, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 642-831, Korea Received 18 June 2013; accepted 13 November 2013 Abstract: Effects of various sintering methods such as spark plasma sintering (SPS), hot pressing (HP) and electric resistance sintering (ERS) on the microstructure and mechanical properties of commercial pure titanium (CP-Ti) powder consolidations with particle size of 147 μm, 74 μm and 43 μm were studied. The smaller particle powders are densified to proceed at a higher rate. Dense titanium with relative density up to 99% is found to take place at 850 °C under 30 MPa of SPS and HP condition. However, in case of ERS, CP-Ti powders were densified almost at 950 °C under 30 MPa. The microstructure of sintered titanium is composed of equiaxed grains at 850−950 °C. The yield strength of sintered body composed of 43 μm powder is 858 MPa by using SPS at 850 °C under 30 MPa. When there is a higher content of small particle, the higher yield strength value