Controlled quenching at case hardening for optimal performance - QuenchCool
|Coordinator||RISE IVF AB - Swerea IVF AB, Mölndal|
|Funding from Vinnova||SEK 7 400 000|
|Project duration||October 2016 - October 2020|
|Venture||FFI - Sustainable production|
Purpose and goal
The objective is to achieve optimum fatigue properties for case hardened components by controlling the cooling at low temperatures where the martensitic transformation occurs. The aim is to develop a model for controlled cooling which enables optimization of the process for increased fatigue strength depending on steel. The mechanisms for increased fatigue strength due to controlled cooling should be clarified and the impact on different steels. The process window for the technology is to be developed.
Expected results and effects
The goal is an improved strength, by more than 15% (three times longer), by introducing controlled cooling for todays and future components without increased cost or longer processing time. The project will develope models of how the cooling rate affects the fatigue strength so that production can quickly be adapted to new components and steel grades in order to reduce lead times. Users of the technology include manufacturers of transmissions for heavy vehicles.
Planned approach and implementation
Today controlled cooling must be set through ´trial and error´ since the mechanisms are not known. This project will in a doctoral project develop models of how the cooling rate affects the fatigue strength so that production can quickly be adapted to new components and steel alloys to reduce lead times. The study consists of controlled measurements in dilatometer, metallographis studies and fatigue tests.