Development of such typical microstructure has been enlightened through the analysis of divorced eutectoid transformation and diffusion controlled mechanisms. This could be attributed to the development of a typical complex microstructure consisted of degenerate pearlite, fragmented cementite and finely dispersed NbC/VC in the matrix of spider network like martensite. In D (m/s) reported for Ni-Al binary alloys. The two cycles heat treatment (i.e., holding for 6 min at Ac 3 + 50 ☌ followed by forced air cooling + holding at intercritical zone for 20 min followed by ice-brine quenching) has resulted a significant increase in the strength with a significant amount of ductility (UTS = 1545 MPa, hardness = 446 HV, 9% elongation). NIMONIC is a trademark of INCO Alloys International, Inc., Hunting- ton, WV. In this work, homogenized annealed samples have been subjected to typical heat treatment cycles that consisted of repeated short-duration holding at different critical temperatures followed by forced air cooling/ice-brine quenching. Typical heat treatment cycles were designed on the basis of critical temperatures, Ac 3 & Ac 1 (obtained through Thermo-Calc software) and TTT/CCT curves (constructed using JMatPro software).
Aim of the present study is to devise simple and economical heat treatment methods to develop ultrahigh strength cast-grade microalloyed steel for industrial applications.
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