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To characterize microstructural  and properties changes of the air-hardening steel LH800® due to heat treatment various experimental investigations were carried out. Amongst others, the TTA-austenite grain size diagram, the martensite transformation curve and the tempering diagram were determined. Based on the experimental data the coefficients of the Koistinen-Marburger model were calculated. This allows for a mathematical description of the martensite formation during hardening. The obtained data can be used not only to improve the experimental process design but also to provide information to improve existing numerical models.

Microstructure evolution of the air-hardening steel LH800® due to heat treatment