The microstructure of austempered ductile iron (ADI) consists of high carbon autenite and bainitic ferrite along with graphite nodules, which is created by austenitising and isothermal austempering. The carbon enriched austenite is metastable and can transform to martensite under load. The stability of the retained austenite depends on the phase transformation kinetics during the heat treatment, which we have studied in previous in-situ investigations using neutron diffraction. The transformation of retained austenite to martensite was also shown in compressed ADI samples.Within the proposed in-situ measurements ADI samples with differently stabilized austenite will be tested under varied tensile and compression loads. The principal aim is to develop a model for the transformation behaviour of ADI materials. An overall beam time of 3 days is estimated to achieve the proposed aims.