25-27 April 2022
Conventum Conference Center
Europe/Vienna timezone

Microstructure and mechanical behavior of a PM tool steel in as-HIPed and HIPed followed by hot working

26 Apr 2022, 15:20
20m
Room 2

Room 2

Oral Presentation Microstructure, properties & performance Microstructure, Properties & Performance

Speaker

Faezeh Javadzadeh Kalahroudi (Karlstad University)

Description

Tool steels are generally produced through a variety of manufacturing routes including conventional route, electro-slag remelting (ESR) and/or vacuum arc remelting (VAR), and powder metallurgy (PM). The PM route offers various advantages for certain steel grades such as advanced alloy composition, homogeneity, and well-defined hard phase particle size distribution. A study on a martensitic Cr-Mo-V-N alloyed PM tool steel grade is presented in this paper. The steel was produced via gas atomization, hot isostatic pressing (HIP), and thermo-mechanical treatment followed by heat treatments. The unique feature of the PM grade is the substitution of carbon with high nitrogen content, and high Cr content, which gives an outstanding combination of high hardness, high wear resistance, and very high corrosion resistance. Near-net shaping by HIP into tooling components is a potential use of this steel, but the steel performance needs to be characterized. To clarify this, a comprehensive comparison was made between as-HIPed and HIPed followed by hot-working, i.e. hot forging. In the present investigation, microstructure and phase analyses were performed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical tests including hardness measurements and un-notched impact tests were carried out. Finally, the fatigue strength of the steel grades was determined using four-point bending fatigue tests in the high cycle fatigue regime.

Speaker Country Sweden

Primary author

Faezeh Javadzadeh Kalahroudi (Karlstad University)

Co-authors

Presentation Materials

There are no materials yet.