Influence of second thermocycling on the autocatalytic nucleation of acicular ferrite in steel welds

摘要：

Autocatalytic nucleation of acicular ferrite in steel welds has been studied using double-side submerged arc welding and laboratory simulations of controlled thermal processing on a Gleeble-1500 hot simulator. The effects of second thermocycling on the acicular ferrite microstructure and nonmetallic inclusions in X70 grade pipe line steel welds were investigated. It is shown that the size of acicular ferrite plate increases and the autocatalytic nucleation of acicular ferrite is improved by the increase in the standing time between 650 and 450℃ during second thermocycling. The mechanism of autocatalytic nucleation of acicular ferrite has been analyzed from the factors of stress energy and carbon distribution.

关键词： Autocatalytic nucleation acicular ferrite second thermocycling nonmetallic inclusion

作者: Guodong Zhang Zhiyuan Li Shengfu Yu Penglin Zhang

作者单位: State Key Lab of Gansu New Nonferrous Metal Materials,Lanzhou University of Science and Technology, School of Materials Engineering, Huazhong University of Science and Technology, Wuhan 430074, China State Key Lab of Gansu New Nonferrous Metal Materials,Lanzhou University of Science and Technology,

会议类型: 国际会议

会议名称: The Fifth International Conference on Physical and Numerical Simulation of Materials Processing(第五届材料与热加工物理模拟及数值模拟国际会议)

会议地点: 郑州

会议语种:英文

在线出版日期: 2007-10-23（万方平台首次上网日期，不代表论文的发表时间）