Study on mechanical properties of warm compacted iron-base materials

Mechanical properties of the warm compacted iron-base powder metallurgy materials were compared with those of conventional cold compacted materials. Factors such as compaction temperature, lubricant concentration and lubricant′s property were studied. A lubricant for warm compaction powder metallurgy was developed. An iron-based powder metallurgy material with a green density of 7.31 g/cm3 (a relative density of 92.5%) can be obtained by pressing the powder at 700 MPa and 175 ℃. The sintered materials have a density of 7.2 g/cm3, an elongation of 2.1% and a tensile strength of 751 MPa compared to 546 MPa using conventional cold compaction with the same lubricant and 655 MPa using warm compaction with other lubricant. Compact density and mechanical properties were influenced strongly by the compacting temperature. Although the best quality compacts can be obtained at 175 ℃, warm compaction within 165 to 185 ℃ can give high density compacts. Evidence shows that compact density depends on the friction coefficient of the lubricant.

Study on mechanical properties of warm compacted iron-base materials

Mechanical properties of the warm compacted iron-base powder metallurgy materials were compared with those of conventional cold compacted materials. Factors such as compaction temperature, lubricant concentration and lubricant’s property were studied. A lubricant for warm compaction powder metallurgy was developed. An iron-based powder metallurgy material with a green density of 7.31 g/cm³ (a relative density of 92.5%) can be obtained by pressing the powder at 700 MPa and 175 °C. The sintered materials have a density of 7.2 g/cm³, an elongation of 2.1% and a tensile strength of 751 MPa compared to 546 MPa using conventional cold compaction with the same lubricant and 655 MPa using warm compaction with other lubricant. Compact density and mechanical properties were influenced strongly by the compacting temperature. Although the best quality compacts can be obtained at 175 °C, warm compaction within 165 to 185 °C can give high density compacts. Evidence shows that compact density depends on the friction coefficient of the lubricant. Foundation item: The National Natural Science Foundation of China (Key Project 50135020); the National Advanced Technology Research and Development Project (863 Project 2001AA337010), Ministry of Education (Excellent Personnel for 21st Century Training Project 2000] no. 1) and the Natural Science Foundation of Guangdong Province (Research Group Project 003019). Biography of the first author: LI Yuan-yuan, Dr., professor, born in Oct. 1958, majoring in materials processing.