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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 microstructural changes and internal friction behavior of C-Mn steel and Nb-containing microalloyed steel during strain aging were studied by scanning electron microscopy, transmission electron microscopy and multi-functional internal friction measuring instrument. The results show that there is no obvious change in the microstructure and the microstructure is stable during the aging process. After the strain aging treatment, the hardness of C-Mn and Nb-containing microalloyed steels increase, the impact toughness decreases, the ductile-brittle transition temperature increases High; micro-alloying element Nb can effectively reduce the strain-aging sensitivity of the steel; both steel plate when heated at 250 ℃ have internal friction peak, which is related to free carbon atoms pinning dislocation and detachment related to the Nb Microalloyed steel has no internal friction peak at room temperature.