含Nb微合金钢静态应变时效行为研究  

Study on Strain Aging Behaviour of Micro-alloyed Steel Containing Nb

作　　者：温永红[1,2] 唐荻[1] 林国强 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083 [2]南京钢铁股份有限公司新产品研发推广中心,江苏南京210035

出　　处：《热加工工艺》2010年第24期60-62,66,共4页Hot Working Technology

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.

关 键 词：含Nb微合金钢 应变时效 内耗 

分 类 号：TG142.33[一般工业技术—材料科学与工程]