Effects of warm compaction on mechanical properties of sintered P/M steels

来源期刊：中南大学学报(英文版)2007年第4期

论文作者：易健宏 叶途明 彭元东 夏庆林 王红忠

文章页码：447 - 447

Key words：warm compaction; die wall lubrication; powder metallurgy; mechanical properties

Abstract: The green and sintered densities, and tensile strength of sintered P/M steels produced by cold compaction, warm compaction, warm compaction combined with die wall lubrication (DWL) were measured under various compaction pressures using polytetrafluoroethylene (PTFE) emulsion as the die wall lubricant. The effects of warm compaction on the mechanical properties were studied. The tensile fracture behaviors of cold compaction and warm compaction were studied using scanning electron microscope (SEM). The results show that the density of sintered P/M steel prepared by warm compaction or warm compaction with DWL is higher than that by cold compaction under all compaction pressures. Meanwhile, the highest tensile strength is obtained by combination of warm compaction and die wall lubrication under all compaction pressures. The SEM results show that the fracture modes of the sintered samples prepared by cold compaction and warm compaction at 700 MPa are the mixed mode of ductile fracture and brittle fracture, and obvious dimples can be found in some regions. The fracture of sample prepared by cold compaction is uneven and has irregular and big pores, but that by warm compaction is relatively even and the pores are round mostly, and the samples have many obvious dimples on the whole fracture surface.

基金信息：the National Key Technological Research and Development Program of China
the Innovative Engineering Program of Central South University