摘要
研究了188型奥氏体不锈钢动态应变时效现象的规律,发现在5×10-4s-1的应变速率下,在523～673K和723～873K的温度范围内会出现动态应变时效现象;在此基础上研究了材料在发生动态应变时效时的微观组织。结果表明:在动态应变时效过程中发生的运动位错与溶质原子之间的交互作用使材料的位错组态发生变化,在相同的预应变量下,随着动态应变时效预处理的温度升高,材料的位错密度提高,形成更复杂、更稳定的位错组态。
The effects of dynamic strain aging (DSA) on mechanical properties of materials have attracted more and more attention in recent years. The tension tests of 18-8 type austenitic stainless steel were carried out at strain rate of 5 × 10-4 and different temperatures (298-973 K) to investigate the effect of temperature on its mechanical properties. It is found that the serrated flow behavior of this material, one of the evident features of dynamic strain aging (DSA) phenomenon occurs in the temperatures of 523-673 K and 723-873 K at strain rate of 5 × 10-4 s-1. The microstructures after DSA pretreatment of this material have been systematically investigated. The results show that the interaction between the moving dislocation and solute atom during DSA makes dislocation configuration change. With increasing pre-strain temperature, the dislocation density increases and forms more complex and more stable dislocation structure.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第5期109-112,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助(50441013)
福建省教育厅资助项目(JA03015)
关键词
动态应变时效
奥氏体不锈钢
位错
塑性变形
Aging of materials
Austenite
Fatigue of materials
Heat treatment
Mechanical properties
Microstructure
Plastic deformation
Strain rate
Tensile strength
