발간논문

Home > KJMM 논문 > 발간논문

Vol.22, No.7, 596 ~ 607, 1984
Title
Effects of Additioning Elements on the Grain Growth in Dual - Phase Steels
위명용 Myeong Yong Wey
Abstract
The grain growth characteristics of dual-phase steels and the effect of alloying elements on the grain growth in these steels have been investigated using 3%Si-0.3%Cr-C system steels which are composed of αand γ-phase at 900-1300℃. The results are as follows: 1) The grain growth rate in dual-phase steels is substantially slower than that of single-phase steels, and it`s rate is the slowest when the volume fractions of α-and γ-grains are almost the same. 2) The major phase in dual-phase steels grows under a pinning action of the minor phase, and the minor phase grows slowly in a mode of Ostwald ripening. Consequently, the major phase grows also slowly in a mode of Ostwald ripening. The grain growth rates of both phases obey the following equation: (r)³- (r_o)³= K₃t 3) The grain growth rates of both the alloyed and unalloyed dual-phase steels obey the Ostwald ripening law. The functions of the alloying elements in dual-phase steels are classified into two types: Partitioning and pinning. The partitioning of alloying elements such as Mn and Mo renders the growth of the minor phase sluggish because these elements make the concentration difference between α-and γ-phase very large. Titanium carbides (TiC) form fine particles and hinder the grain growth rate by the pinning mechanism.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.