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Acta Metall Sin  1986, Vol. 22 Issue (6): 46-51    DOI:
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EFFECT OF SOLUTION STRENGTHENING OF AUSTENITE ON MARTENSITIC TRANSFORMATION IN Fe-Ni-C ALLOYS
by XU Zuyao (T.Y. Hsu); LI Jian; ZENG Zhenpeng (Shanghai Jaiotong University)
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by XU Zuyao (T.Y. Hsu); LI Jian; ZENG Zhenpeng (Shanghai Jaiotong University). EFFECT OF SOLUTION STRENGTHENING OF AUSTENITE ON MARTENSITIC TRANSFORMATION IN Fe-Ni-C ALLOYS. Acta Metall Sin, 1986, 22(6): 46-51.

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Abstract  The M_s temperature and the yield strength of austenite have been measured for 5 various Fe-Ni-C alloys. The solution strengthening of austenite at M_s temperature can be expressed as: σ_(0·2)(M_s)=25.9+3410x_c+567x_(Ni) MPa, and the effect of C and Ni content on M_s temperature can be shown as: M_s (K)=829-8650x_c-1766x_(Ni·) The linear relationship between M_s temperature and σ_(0·2)(M_s) can be written as: σ(0·2)(M_s)=210-0.323M_s(℃) MPa. These equations indicate that the solution strengthening of austenite at M_s temperature acts as the resistance of martensitic transformation and the linear relation exists not only between σ0·2(M_s) and M_s, but also σ_(0·2)(M_s) and the driving force for martensitic transformation. Since the substructure of martensite depends on the Ni and C content in alloys, a schematic sketch showing the effect of σ_(0·2)(M_s) on the morphology of martensite in Fe-Ni-C alloys is developed through the work of Magee and Davies. Based on this view, the relationship between σ_(0·2)(M_s) and the critical resolved shear stress may be sketched which interpret the formation of dislocation and twinned martensite.
Received:  18 June 1986     
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