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

Short-term heat treatment of the high-alloy cold-work tool steel X155CrMoV12-1: Calculation of metastable microstructural states

25 Apr 2022, 16:20
20m
Room 2

Room 2

Oral Presentation Simulations & modelling Simulation & Modelling

Speaker

Jannik Schuppener

Description

High-quality tool steels are the backbone of our production system across the globe: they shape a wealth of other materials to our convenience, producing parts of all sizes and geometries. Typical properties of these tools are high strength, hardness, wear resistance, coupled with sufficient toughness. These properties are achieved in tool steels by a multiphase microstructure, which can be adjusted according to the service requirements via the manufacturing route, chemical composition, and heat treatment. All microstructural components contribute to the emerging macroscopic properties, and yet the nucleation, growth, and coarsening of metastable phases are not usually acknowledged.

The influence of short-time heat treatment on the widely used and commercially available ledeburitic cold work tool steel 1.2379 (X155CrMoV12-1; AISI D2) was examined in this work. Starting from a soft annealed initial condition, the influence of different austenitizing temperatures and holding times on the metastable microstructural states after heat treatment/hardening was investigated. Experimental performance was tested using a quench dilatometer, and a microstructural simulation model was built using these results. As validation of the model, on the one hand, the martensite-start temperature was used, which was measured experimentally by dilatometry. On the other hand, the carbide quantity and distribution, as determined by quantitative image analysis, were compared with the simulated one and used as an indicator of the model accuracy.

Through the developed simulation model, arbitrary heat treatment-induced metastable microstructural states can be calculated. As a possible application of this model, we discuss the live-adaption of the industrial heat treatment

Speaker Country Germany

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