EFFECT OF AUSTENITE AGING ON MARTENSITIC-TRANSFORMATION

The effect of austenite ageing on martensite transformation in an iron and nickel alloy was studied. Attention was paid to the variation of dislocation configurations in austenite before martensite transformati on, The clusters or precipitates produced during austenite ageing and the alteration of dislocation configurations affect together the conse quent martensite transformation. Dispersed fine clusters and precipita tes cripple nucleus role of special dislocation configurations and dro p M-s. Coarse precipitates make M-g rise again. Densely piled up dislo cations in nuclei lead to rise of M-s. All the changes in austenite ar e of benefit to small martensite plates.