Influence of sintering parameters on the mechanical performance of PM steels pre-alloyed with chromium

被引：14

作者：

Bergman, Ola ^{[1
]}

Lindqvist, Bjorn ^{[2
]}

Bengtsson, Sven ^{[1
]}

机构：

[1] Hoganas AB, Res & Dev, S-26383 Hoganas, Sweden

[2] Hoganas China Ltd, Tech Ctr, Shanghai 201700, Peoples R China

来源：

PROGRESS IN POWDER METALLURGY, PTS 1 AND 2 | 2007年 / 534-536卷

关键词：

PM steel; chromium; sintering atmosphere; sintering temperature; oxide reduction;

D O I：

10.4028/www.scientific.net/MSF.534-536.545

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Powder grades pre-alloyed with 1.5-3 wt% chromium are suitable for PM steel components in high performance applications. These materials can be successfully sintered at the conventional temperature 1120 degrees C, although well-monitored sintering atmospheres with low oxygen partial pressures (< 10(-17)-10(-18) atm) are required to avoid oxidation. Mechanical properties of the Cr-alloyed PM grades are enhanced by a higher sintering temperature in the range 1120-1250 degrees C, due to positive effects from pore rounding, increased density and more effective oxide reduction. A material consisting of Astaloy CrM, which is pre-alloyed with 3 wt% Cr and 0.5 wt% Mo, and 0.6 wt% graphite obtains an ultimate tensile strength of 1470 MPa combined with an impact strength of 31 J at density 7.1 g/cm(3), after sintering at 1250 degrees C followed by cooling at 2.5 degrees C/s and tempering.

引用

页码：545 / +

页数：2