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Fabrication of Gas-permeable Die Materials Having Orthogonally Arrayed Pore Channels
Chan Tien-Yin,Lin Shun-Tian,Chang Hua-Jun,Chen Chia-Liang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Gas-permeable metal die materials are developed using tool steel powder, packed in a mold having the insertion of orthogonally arrayed polymer wires. Linear gas-permeable channels in orthogonal array are thus developed by the burning out of the polymer wires, which yield a microstructure with wear resistance value and air permeability much larger than those of the conventional gas-permeable die material.
The Effects of Molybdenum Content on the Dynamic Properties of Tungsten-based Heavy Alloys
Lee Woei-Shyan,Chan Tien-Yin 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Hopkinson bar dynamic test under strain rates ranging from 2000 to 8000 at room temperature revealed that the flow stress of tungsten heavy alloys depended strongly on the strain, strain rate, and the content of molybdenum. The variation of flow stress was caused by the competition between work hardening and heat softening in the materials at different strain rates. The high temperature strength of the matrix phase was increased by the addition of molybdenum, which enhanced the strength of the tungsten heavy alloys in high strain rate test.