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通过SEM、TEM和多功能内耗仪研究了F40级船板钢应变时效后的微观组织变化以及时效过程中的内耗行为.结果表明:应变时效过程中,F40级船板钢宏观组织没有发生明显的变化,组织很稳定;在内耗-温度曲线上230℃时出现一个内耗峰,这是由于游离态的碳原子在此条件下钉扎位错和摆脱位错钉扎所导致;位错组态的变化及位错与碳原子相互作用的宏观效应表现为钢板应变时效后硬度上升,韧性下降,韧脆转变温度升高.
The microstructure changes of F40 ship steel after strain aging and the internal frictional behavior during aging were studied by means of SEM, TEM and multi-function internal friction instrument.The results show that the macro-organization of F40-class ship steel did not appear obvious during the strain aging process Change, the organization is very stable; internal friction - temperature curve at 230 ℃ when a friction peak, which is due to free carbon atoms in this condition pinning dislocation and get rid of dislocation pinning caused by; dislocation configuration changes And the macro-effect of the interaction between dislocations and carbon atoms show that the hardness of the steel increases after strain aging, the toughness decreases, and the temperature of the ductile-brittle transition increases.