Topic
Microalloyed steel
About: Microalloyed steel is a research topic. Over the lifetime, 2183 publications have been published within this topic receiving 33586 citations.
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TL;DR: In this paper, two types of processing maps have been constructed on the basis of phenomenological and continuum criteria to study the hot workability of a medium carbon microalloyed steel.
37 citations
TL;DR: In this paper, a strain-induced transformation of austenite to ferrite during hot compression testing of a low carbon microalloyed steel was investigated by using optical microscopy and electron back-scattered diffraction.
37 citations
TL;DR: In this paper, the effects of thermomechanical processing (TM P), accelerated cooling and composition (Mn+Si levels) on γ transformation start temperature (Ar 3 ), phase transformation kinetics, CCT diagrams and microhardness are investigated.
Abstract: Continuous cooling transformation (CCT) behaviour of high strength microalloyed steels containing two different levels of Mn+Si additions is investigated in undeformed and thermomechanically processed conditions using quench and deformation dilatometry respectively. The deformation schedule used in the dilatometer is designed to simulate the industrial controlled rolling procedures for the production of plates as closely as possible in laboratory. CCT diagrams for the undeformed and thermomechanically processed steels are constructed. Effects of thermomechanical processing (TM P), accelerated cooling and composition (Mn+Si levels) on γ transformation start temperature (Ar 3 ), phase transformation kinetics, CCT diagrams and microhardness are investigated. The results show that TMP accelerates the onset of γ/α transformation (Ar 3 is raised), but the progress of γ/α transformation is retarded considerably in deformed samples. Significant retardation is observed during the final 30% of the phase transformation reaction. Increase in cooling rate lowers the Ar 3 significantly and accelerates the progress of transformation. The steel with a higher level of Mn+Si addition (1.96%) exhibits lower Ar 3 , sluggish transformation kinetics and higher hardnesses in undeformed and thermomechanically processed conditions as compared with the steel with a lower level of Mn+Si addition (1.17%). These effects are explained in terms of the effects of Mn and Si contents on the carbon partitioning and the subsequent phase transformation behaviour of these steels during continuous cooling. Increase in cooling rate increases the microhardnesses of both steels while TMP lowers them.
37 citations
TL;DR: In this article, a metallographic technique is presented that enables a quick and accurate identification of the martensite-austenite island by both light optical and scanning electron microscopy.
37 citations
TL;DR: In this article, the effect of V(C,N) precipitates undissolved in austenite on structure and mechanical properties of the medium carbon microalloyed V-N steels has been studied.
37 citations