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卷取溫度對低碳鋼組織性能及AlN析出行為的影響

Effect of coiling temperature on the AlN precipitation,microstructure and mechanical properties of low carbon steel

  • 摘要: 運用拉伸、金相、析出物定量分析、TEM和EDS等測試方法,對不同卷取溫度低碳鋼組織性能及析出進行研究.結果表明:隨著卷取溫度的升高,鋼的強度和晶粒度等級下降,固溶的N含量逐漸降低,740℃卷取時固溶的N含量幾乎為零.熱力學和動力學分析表明,AlN主要是在卷取過程中產生的.透射電鏡觀察到的AlN尺寸在10~50nm,并且具有復雜的化學成分.

     

    Abstract: The precipitation,microstructure and mechanical properties of low carbon steel at different coiling temperatures were investigated by tensile testing,metallography,quantitative analysis of precipitates,TEM and EDS.The results show that with the coiling temperature increasing,the strength and grain size grade of the steel and the content of nitrogen in solution decrease gradually;at a coiling temperature of 740℃,the content of nitrogen in solution is almost zero.Thermodynamic and kinetic analyses indicate that AlN precipitates in coiling chiefly.The sizes of AlN,with complex chemical composition,are between 10nm and 50nm.

     

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