On the Role of Chromium in Dynamic Transformation of Austenite

被引：10

作者：

Chadha, K. ^{[1
]}

Shahriari, Davood ^{[1
]}

Aranas, C. Jr. ^{[2
]}

Lapierre-Boire, Louis-Philippe ^{[3
]}

Jahazi, Mohammad ^{[1
]}

机构：

[1] Ecole Technol Super, Dept Mech Engn, 1100 Notre Dame Quest, Montreal, PQ H3C 1K3, Canada

[2] Univ New Brunswick, Dept Mech Engn, Fredericton, NB E3B 5A3, Canada

[3] Finkl Steel Sorel, Operat, 100 McCarthy, St Joseph De Sorel, PQ J3R 3M8, Canada

来源：

METALS AND MATERIALS INTERNATIONAL | 2019年 / 25卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Dynamic transformation; Medium-carbon low-alloy steel; Phase transformation; Stress induced diffusion; As-cast structure; WIDMANSTATTEN FERRITE; DEFORMED AUSTENITE; BEHAVIOR; TEMPERATURES; DEFORMATION; STEEL; ACTIVATION; INITIATION; EVOLUTION; STRESS;

D O I：

10.1007/s12540-018-00227-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of Chromium (Cr) on the dynamic transformation (DT) of austenite to ferrite at temperatures up to 430 degrees C above Ae(3) was studied in a medium-carbon low-alloy steel. Hot compression tests were performed using Gleeble 3800((R)) thermomechanical simulator followed by microstructural examinations using electron microscopy (FESEM-EBSD). Driving force calculation using austenite flow stress and ferrite yield stress on an inverse absolute temperature graph indicated that Cr increases the driving force for the transformation of austenite to ferrite; however, when the influence of stress and thermodynamic analysis are taken into account, it was observed that Cr increases the barrier energy and therefore, emerges as a barrier to the transformation. An analysis, based on lattice and pipe diffusion theories is presented that quantifies the role of stress on the diffusivity of Cr and is compared with other the main alloying elements such as C, Si and Mn and its impact, positive or negative, on the DT barrier energy. Finally, a comparison is made on the differential effects of temperature and stress on the initiation of DT in medium-carbon low-alloy steels.

引用

页码：559 / 569

页数：11

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