발간논문

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Vol.36, No.8, 1205 ~ 1215, 1998
Title
Effect of Chromium on Precipitation Reactions and Mechanical Properties of Fe-Ni-Mn-Mo-Ti Steels
문승호 , 이후철 Seung Ho Mun , Hu Chul Lee
Abstract
The precipitation reaction and mechnical properties of Fe-8Ni-3.5Mn-5Mo-1Ti alloys without and with 5% Cr addition were investigated. Two stages of age-hardening due to the precipitation of rod-type η-Ni₃Ti and spherical-type Fe₂Mo intermetallics were observed. The addition of chromium increased the age hardening rate and peak hardness of the base alloy. especially at the second hardening stage. From TEM analyses, it is concluded that chromium addition refines the precipitation, suppresses the coarsening of rod type precipitates and considerably promotes the formation of spherical type precipitates during the second stage of aging. The Fe-8Ni-3.5Mn-5Mo-1Ti alloy showed intergranular and cleavage fracture during first stage of aging at 520℃, but higher ductility with higher strength was achieved in the 5% Cr-bearing alloy. Lower grain boundary segregation of the embrittling alloying elements Mn and Ti, etc. in the Cr-bearing alloy was suggested. The optimun combination of strength and ductility was obtained in the Fe-8Ni-3.5Mn-5Mo-1Ti-5Cr alloy aged at 520℃ for 8 hours and obtained values were σ_(0.2) = 1611 MPa. σ_t = 1739 MPa and ε_f = 9.8%.
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