Processing and Mechanical Properties of Low-Temperature Sintered Fe-P-C Alloy
Date Issued
2006
Date
2006
Author(s)
Yen, Fu-Cheng
DOI
zh-TW
Abstract
Alloyed parts with complicated shape, smooth surface toughness and near net shape can be fabricated in metal injection molding (MIM) process. But green parts made by MIM process just have only 50-60% relative density, it is necessary to use lower than 10μm ultra fine powder as starting powder and sinter at 1200-1300℃ high temperature for 2 horses then 94% relative density can be ontained.
Higher equipment cost and energy consumption followed by high temperature sintering result in lower competition for MIM process. So design alloy composition for low temperature sintering to make allying parts sinter at belt furnace with lower cost then have sintered density above 90% and good mechanical properties.
It is showed that Fe-0.7P-C sintered at 1080℃ for 30mins can get the value of 7.4g/cm3 in sintered density, 800MPa in ultimate tensile strength, HRB98 in hardness, 12% in elongation in this study, that is superior to standard MIM-4605 counterpart which has better mechanical properties in MPIF. The uniform elemental distribution and ductile dimple structure can be observed by EPMA and SEM equipment even sintered at low temperature
Additionally, the possibility of P content causing segregation and its mechanism were also studied in this experiment. According to the experimental results, when P content in Fe-C alloy is more than 0.7wt%, the original ductile dimple structure turning into brittle intergranular structure on fracture surface was observed.
Fe-0.7-C alloy sintered at low temperature for short time has optimal mechanical properties as compared to other counterparts in this study.
Subjects
金屬粉末射出成形
低溫燒結
網帶爐
α相燒結
Fe-0.7P-C系合金
Metal Injection Molding
Low Temperature Sintering
Belt Furnace
α-Phase Sintering
Fe-0.7P-C Alloy
SDGs
Type
thesis
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