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
温永红1,2, 唐 荻1, 林国强2
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作者单位：(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)
中文关键字：含Nb微合金钢； 应变时效； 内耗
英文关键字：Nb micro-alloyed steel; strain aging; internal friction
中文摘要：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。
英文摘要：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.