Strain aging of F40 hull structure steel
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摘要: 通過SEM、TEM和多功能內耗儀研究了F40級船板鋼應變時效后的微觀組織變化以及時效過程中的內耗行為.結果表明:應變時效過程中,F40級船板鋼宏觀組織沒有發生明顯的變化,組織很穩定;在內耗-溫度曲線上230℃時出現一個內耗峰,這是由于游離態的碳原子在此條件下釘扎位錯和擺脫位錯釘扎所導致;位錯組態的變化及位錯與碳原子相互作用的宏觀效應表現為鋼板應變時效后硬度上升,韌性下降,韌脆轉變溫度升高.Abstract: The effects of strain aging on the microstructure evolution and internal friction of F40 hull structure steel were studied by SEM, TEM and multi-functional internal friction apparatus. The result showed that there was no obvious change in microstructure during the process of strain aging, displaying better mierostructure stability. A peak was found in the curve of internal friction to temperature, which can be attributed to C trapping on dislocations and dislocation motion. The strain aging phenomenon induced an increase in hardness associated with ductility loss and large toughness reduction. This trend is attributed to dislocation configurations and the interaction between interstitial carbon and dislocations.
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Key words:
- hull structure steel /
- strain aging /
- microstructure /
- internal friction
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