论文信息 - Phase Separation in Aged Diffusion-Couples Fe/Fe-40 at%Cr Alloy

Phase Separation in Aged Diffusion-Couples Fe/Fe-40 at%Cr Alloy

Diffusion-couples of pure Fe/Fe-40 at%Cr alloy were used to analyze the phase separation process in Fe-Cr alloys. Diffusion-couples were solution treated at 1050°C for 3.6 ks and subsequently aged at 500°C for 3.6–3600 ks. Interdiffusion zones were analyzed by HR-TEM and hardness measurements. The EDS-SEM analysis of solution treated, water-quenched and then aged diffusion-couple permitted to obtain the equilibrium composition of miscibility gap at 500°C to be 14 at% Cr. The HR-TEM analysis of the aged diffusion-couple showed the change in size and volume percentages of precipitates with composition. The hardness measurements of the aged diffusion-couple indicated the age hardening due to the presence of nanometric Cr-rich precipitates in a Fe-rich matrix.

H. Dorantes-Rosales | M. Saucedo-Muñoz | V. M. Lopez-Hirata | E. O. Avila-Davila | N. Cayetano‐Castro

[1] Jorge L. Gonzalez-Velazquez,et al. Effect of spinodal decomposition on the mechanical behavior of Fe–Cr alloys , 2010 .

[2] J. K. Sahu,et al. Effect of 475 ◦ C embrittlement on the mechanical properties of duplex stainless steel , 2009 .

[3] H. Dorantes-Rosales,et al. Gibbs–Thomson relationship for the precipitation in Cu–Ti alloys , 2007 .

[4] Y. Ustinovshikov,et al. Fe-rich portion of the Fe-Cr phase diagram: electron microscopy study , 2002 .

[5] P. Auger,et al. Atom Probe Studies of the Fe–Cr System and Stainless Steels Aged at Intermediate Temperature: A Review , 2000 .

[6] T. Koyama,et al. A new characterization method of the microstructure using the macroscopic composition gradient in alloys , 1996 .

[7] C. M. Elliott,et al. Spinodal decomposition in Fe-Cr alloys: Experimental study at the atomic level and comparison with computer models—I. Introduction and methodology , 1995 .

[8] L. Schwartz,et al. Further studies of spinodal decomposition in Fe-Cr , 1986 .

[9] B. Eyre. Book Review: Austenitic stainless steels - microstructure & mechanical properties. P. Marshall (Elsevier Applied Science Publishers, London and New York, 1985), Price £40.00 , 1986 .

[10] M. Miller,et al. Spinodal decomposition of iron-32 at.% chromium at 470°C☆ , 1982 .

[11] J. E. Hilliard,et al. Spinodal decomposition: A reprise , 1971 .