摘要
采用扫描电镜、透射电镜及多功能内耗测量仪,研究了C-Mn型钢及含Nb微合金钢在应变时效过程中的微观组织结构变化以及内耗行为。结果表明:在应变时效过程中,宏观组织没有发生明显的变化,组织稳定;应变时效处理后,C-Mn型钢和含Nb微合金钢的硬度均提高,冲击韧度下降,韧脆转变温度升高;微合金元素Nb能有效地降低钢板的应变时效敏感性;两种钢板在250℃加热时均有冷加工内耗峰存在,这与游离态的碳原子钉扎位错和脱钉有关,而含Nb微合金钢在室温没有内耗峰存在。
The variation of microstructure and internal friction in Nb micro-alloyed steel and C-Mn steel during strain aging were studied by SEM,TEM and virban inverted torsion pendulum-internal meter.The results show that there is no obvious macrostructure change during strain aging,the microstructure is stable.The hardness of Nb micro-alloyed steel and C-Mn steel increases after aging treatment,but impact toughness decreases,the temperature of ductility-friability transition increases.the aging of Nb micro-alloyed steel is more slowly than that of C-Mn steel.There is a peak in internal friction-temperature curve of the samples at 250 ℃,which relates to the C trapping on the dislocations and the dislocation motion,but there is no internal-friction peak at room temperature in Nb micro-alloyed steel.
出处
《热加工工艺》
CSCD
北大核心
2010年第24期60-62,66,共4页
Hot Working Technology
关键词
含Nb微合金钢
应变时效
内耗
Nb micro-alloyed steel
strain aging
internal friction
