Vacuum sintering of chromium alloyed powder metallurgy steels
Journal article, 2019

Modern developments in vacuum furnace technologies have led to an increased interest in vacuum sintering of powder metallurgy (PM) steel components owing to the robustness, productivity and the possibility to integrate heat-treatment into the process at an attractive cost. In the present study, the potential for vacuum sintering of chromium-alloyed PM steels and the effect of the vacuum level on the final properties of the components are evaluated. The studies were performed on Fe-1.8 wt.% Cr powder and the sintering experiments were performed in a dilatometer. Four different vacuum levels: 10, 1, 10−2 and 10−4 mbar were studied and the effect of density and carbon content were also examined. The results indicate an efficient oxide reduction and process robustness at intermediate vacuum levels whereas high-temperature sintering in high vacuum brings the risk of Cr-sublimation. Furthermore, industrial trails were performed at 10 and 1 mbar vacuum levels and their mechanical properties were evaluated. Vacuum sintering proved to be an attractive alternative to process Cr-alloyed steel powders.

Author

Maheswaran Vattur Sundaram

Chalmers, Industrial and Materials Science, Materials and manufacture

Seshendra Karamchedu

Surface and Microstructure Engineering

Clement Gouhier

Surface and Microstructure Engineering

Eduard Hryha

Chalmers, Industrial and Materials Science, Materials and manufacture

Ola Bergman

Höganäs

Lars Nyborg

Chalmers, Industrial and Materials Science

Metal Powder Report

0026-0657 (ISSN)

Novel sintering strategy for the competitive manufacturing of the high-performance PM components

VINNOVA, 2013-10-01 -- 2016-12-31.

Driving Forces

Sustainable development

Areas of Advance

Production

Materials Science

Subject Categories

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

DOI

10.1016/j.mprp.2019.01.003

More information

Latest update

7/21/2019