Investigation of transformation for ultrahigh strength steel Aermet 100

Abstract

Abstract: The heat-stagnation curves of two quenched and cryogenically treated ultrahigh strength AF1410 and Aermet 100 steels during heating and cooling in furnace have been measured. The results showed that the curve displayed an abnormal terrace in the course of heating, and within the temperature range corresponding to the terrace, the formation and growth of both cementite Fe3C and secondary hardening phase M2C in the steel make the carbon content in matrix obviously vary. It is in the region of terrace that the optimum combination of tensile strength and fracture toughness is obtained because of secondary hardening. Based on the measured heat-stagnation curve, several transformation points have been determined and the correctness was also verified by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Furthermore, the influence of heating rate and tempering temperature on the crystal structure and stability of austenite has been studied.

Key words:

Liuding WANG, Lin LIU, Chengxi AO, Xiaojun LIU, Changle CHEN, Mokuang KANG. Investigation of transformation for ultrahigh strength steel Aermet 100[J]. J Mater Sci Technol, 2000, 16(05): 491-494.

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Investigation of transformation for ultrahigh strength steel Aermet 100

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