Nanocarbides II – Influence of deep cryogenic treatment on distortion, corrosion and fracture toughness

Initial Position / Aims:

  • In a previous project, high-alloy steels from the hot work, cold work and plastic moulding sectors were subjected to an adapted heat treatment, integrating a cryogenic treatment into the steps of austenitising, quenching and tempering in such a way that a comparable hardness was achieved during hardening and tempering or hardening, cryogenic cooling and tempering. Main effects of deep cooling are the reduction of the residual austenite content already during cooling and the precipitation of finer secondary carbides during tempering for the higher carbon alloyed steels.
  • Three aspects have not yet been investigated. One is shape changes that occur during hardening and tempering. The integration of a cryogenic treatment can lead to improved dimensional stability. Due to the altered shape changes when using cryogenic treatment, it can be assumed that the residual stress states in the quenched and tempered state will change. These can influence the tendency to hydrogen embrittlement.
  • In addition, the occurrence of fine, homogeneously distributed secondary carbides during tempering could be increased by the cryogenic treatment. Within the framework of this project, the corrosion behaviour when using cryogenic treatment will be also investigated.

Results:

  • Influence of fine, homogeneously distributed secondary carbides on distortion, corrosion and fracture toughness.

Recommendation

INCERV – Ceramic hot gas fans

Initial situation: Use of metallic fans is only possible to a limited extent due to high temperature values in industrial […]

IntellCutProcess – Optimisation of cutting processes using intelligent cutting tools

Situation: The company Adient produces seat rails (by forming and punching of steel sheet) with an annual production of approx. […]

FlexElectricSteel – : Intraday Energy Management for Electric Steel Plants

Initial Situation Fluctuating energy supply requires new approaches to energy flexibility also in the electric steel production sector Determination of […]

IConSys – Improved quality management in flat steel production

Initial situation DSS developed during DECFLAQ project is successful running since 2007 at ThyssenKrupp Rasselstein Operators are supported to check […]