Effect of alloying elements addition on coarsening behavior of pearlitic cementite particles after severe cold rolling and annealing

被引：42

作者：

Lv, Z. Q. ^{[1
]}

Sun, S. H. ^{[1
]}

Wang, Z. H. ^{[1
]}

Qv, M. G. ^{[1
]}

Jiang, P. ^{[1
]}

Fu, W. T. ^{[1
]}

机构：

[1] Yonshan Univ, Coll Mat Sci & Engn, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 489卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

high carbon steel; cementite; coarsening kinetics; alloying elements; cold rolling;

D O I：

10.1016/j.msea.2007.12.005

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The coarsening kinetics of cementite (theta) particles in severely cold-rolled and annealed pearlite in Fe-0.8 mass% C alloys with various contents of Cr, Mn and Si were investigated, and the effect of alloying elements was discussed. The results showed that severely cold-rolled pearlitic cementite spheroidized rapidly during annealing at 923 K in the Fe-0.8C alloys, and the coarsening of theta particles is strongly suppressed by the addition of Cr, Mn and Si. The coarsening kinetics of theta particles obeys the relationship, d = kt(n), and the staged change appears on the coarsening kinetics curves. In Fe-0.8C alloy, the solute atoms diffused mainly along dislocations at the first stage, but they diffused mostly along the grain boundaries during the subsequent annealing. The addition of Cr or Mn restrained coarsening of theta particles due to decrease of diffusivity of carbon atoms, but this suppression effect weakened after a long-time annealing (more than 3 h). The addition of Si accelerated exclusion of carbon atoms from the rolled alpha-Fe, thus it changed the diffusion pattern of solute atoms and increased the n value at the initial annealing stage (similar to 0.6 ks). During the subsequent annealing (0.6-10.8 ks), the addition of Si suppressed the coarsening of theta particles pronouncedly. (C) 2008 Published by Elsevier B.V.

引用

页码：107 / 112

页数：6

共 24 条

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