摘要
利用SEM、TEM、EBSD和多功能内耗仪研究了应变量和时效温度对热连轧X100管线钢显微组织和力学性能的影响,及其时效过程的内耗行为。结果表明:应变量小于2%时,仅有块状铁素体发生明显变形;当应变量大于3%时粒状贝氏体呈现出明显变形。随着应变量增加铁素体板条内部位错密度增加,并且形成许多亚结构,大角度晶界数量显著减小,韧性显著下降;随着时效温度升高,抗拉强度和屈服强度都呈上升趋势,应变量对强度的影响大于时效温度的影响。内耗试验证实,X100管线钢时效强化主要归因于游离态的C原子对位错的钉扎作用。
The impact of strain and aging temperature on microstructure and mechanical properties of X100 pipeline steel as hot continuous rolling and its internal friction during aging were investigated by means of SEM, TEM, EBSD and virban inverted torsion pendulum-internal meter. The results show that only massive ferrite deforms remarkably when stain is less than 3%, and granular bainite shows a significant deformation when stain is more than 3%. With the increase of strain, the dislocation density increases and many substructures are formed in Ferrite laths, while the amount of high angle grain boundaries and toughness decrease significantly. With the increase of aging temperature, both tensile strength and yield strength show a rising trend, and the impact of strain on strength is greater than impact of the aging temperature. The test of internal friction conforms that the aging strengthening of X100 pipeline steel is mainly attributable to the pinning effect of carbon atom in free state on the dislocation density.
出处
《钢铁》
CAS
CSCD
北大核心
2014年第8期76-80,共5页
Iron and Steel
基金
"十一五"国家科技支撑计划资助项目(2006BAE03A06)
江西理工大学科研基金资助项目(NSFJ2014-K03)
关键词
管线钢
应变
时效
大角度晶界
内耗
pipeline steel
strain
aging
high angle grain boundary
internal friction
