The Controlled Rolling and Properties of Non-Heat Treated Steel-40MnVS
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摘要: 研究了非調質鋼40MnVS鋼在控軋條件下的金相組織與力學性能,分析了工藝參數對金相組織和力學性能的影響。試驗結果表明:增大軋后冷卻速度(從0.1→11℃/s),顯著提高鋼的強度,而韌性、塑性基本保持不變,這與組織中出現細小鐵素體晶粒有關。終軋溫度的變化(850～1050℃)對強度、塑性影響不大。隨終軋溫度的升高韌性較大幅度地下降,當軋后冷速<1℃/s時更為突出,這與鐵素體晶粒粗化相對應。室溫沖擊韌性受鐵素體含量和晶粒尺寸控制。Abstract: The microstructure and properties of non-heat treated vanadium alloyed steel-40MnVS after controlled rolling have been investigated. The results showed that the strength and toughness are increases with accelerating cooled (from 0.1℃/s to 11℃/s) after rolling, because of ferrite grain refinement. The effects of finish-rolling temperature (from 850℃ to 1050℃) on the strength and ductility is unnoticeable, but the toughness is decreased clearly. When cooled speed is slower than 1℃/s, the toughness at room temperature are controlled by ferrite grain and its volume fraction.
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Key words:
- controlled rolling /
- non-head treated steel /
- microstructure /
- property
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