南京工业大学学报（自然科学版）2011，Vol.33Issue(2)：28-32,5.DOI:10.3969/j.issn.1671-7627.2011.02.007
时效时间对Cr35Ni45Nb离心铸造奥氏体钢
Effects of aging time on mechanical properties and microstructure in Cr35Ni45Nb centrifugally cast austenitic steel
摘要
Abstract
The effect of different aging times at 1 200 ℃ ageing temperature on (900 ℃ ) mechanical properties and microstructure at room temperature and high temperature was investigated on Cr35Ni45Nb steel for ethylene cracking furnace tube. The results showd that mechanical properties of Cr35Ni45Nb steel at 1 200 ℃ ageing temperature increased at first and then decreased with aging time increasing. Ultimate tensile strength, yield strength, elongation and, impact ductility reached the peak values after ageing for 135. 2 h. It was summarized that the aging time had an obvious effect on the microstructure. Preeipitated and dispersed fine secondary carbide particles could strengthen comprehensive properties of Cr35Ni45Nb steel. However, Needle-like secondary carbides, previous precipitated fine secondary carbides coarsens and coalesces close and along the grain boundaries, the primary continuous dendritic carbide network changed into less-continuous chain to degradate the mechanical properties and to deteriorate the microstructure.关键词
时效时间/Cr35Ni45Nb钢/离心铸造奥氏体钢/力学性能/微观组织Key words
aging time/ Cr35Ni45Nb steel/ centrifugally cast austenitic steel/ mechanical property/ microstructure分类
矿业与冶金引用本文复制引用
沈利民,巩建鸣,姜勇,耿鲁阳..时效时间对Cr35Ni45Nb离心铸造奥氏体钢[J].南京工业大学学报（自然科学版）,2011,33(2):28-32,5.基金项目
国家高技术研究发展计划(863计划)资助项目(2007AA042407) （863计划）
国家自然科学基金资助项目(50775107) （50775107）
南京工业大学博士论文创新基金资助项目(BSCX200816) （BSCX200816）
