硅含量和过时效温度对冷轧低合金高强钢组织与性能的影响
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摘要
以Nb+Ti系冷轧低合金高强钢为研究对象,探讨了Si含量和过时效温度对钢板组织与性能的影响。结果表明:退火温度为760～820℃,含0. 5%Si的钢板较0. 1%Si钢板的抗拉强度更高、屈服强度更低,伸长率更高;提高硅含量后,组织中铁素体的纯净度更高,并生成一定量的贝氏体。过时效温度从400℃降低到280℃,0. 5Si钢板的强度升高、屈强比降低、伸长率降低;降低过时效温度后,组织中贝氏体的含量升高,铁素体晶粒更细。
Effects of Si content and overaging temperature on microstructure and mechanical properties of cold rolled HSLA sheet were studied. The results show that when annealed at 760-820 ℃,the tensile strength and elongation of the steel sheet contained 0. 5% Si is higher,while the yield ratio is lower,compared with the one contained 0. 1% Si. When the silicon content is increased,the purity of the ferrite in the microstructure is higher,and a certain amount of bainite is formed. With the decrease of overaging temperature from 400 ℃ to280 ℃,for the 0. 5 Si steel sheet,the strength increases,yield ratio decreases and elongation decreases. Furthermore,the content of bainite increases and grain size of ferrite is finer with the decrease of overaging temperature.
Effects of Si content and overaging temperature on microstructure and mechanical properties of cold rolled HSLA sheet were studied. The results show that when annealed at 760-820 ℃,the tensile strength and elongation of the steel sheet contained 0. 5% Si is higher,while the yield ratio is lower,compared with the one contained 0. 1% Si. When the silicon content is increased,the purity of the ferrite in the microstructure is higher,and a certain amount of bainite is formed. With the decrease of overaging temperature from 400 ℃ to280 ℃,for the 0. 5 Si steel sheet,the strength increases,yield ratio decreases and elongation decreases. Furthermore,the content of bainite increases and grain size of ferrite is finer with the decrease of overaging temperature.
引文
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[3]张中武.高强度低合金钢(HSLA)的研究进展[J].中国材料进展,2016,35(2):141-150.Zhang Zhongwu. Research development of high strength low alloy(HSLA)steels[J]. Materials China,2016,35(2):141-150.
[4]卿家胜,沈厚发.冷轧双相钢DP800生产工艺及性能研究[J].钢铁钒钛,2017,38(1):138-142.Qing Jiasheng, Shen Houfa. Production process and properties of DP800 dual phase steel[J]. Iron Steel Vanadium Titanium,2017,38(1):138-142.
[5]李伟,朱晓东.临界区加热温度对低碳当量冷轧超高强双相钢组织及性能的影响[J].宝钢技术,2017(2):15-18.Li wei. Zhu Xiaodong. Effect of intercritical annealing temperature on microstructure and mechanical properties of a cold rolled ultra high strength dual-phase steel[J]. Baosteel Technology,2017(2):15-18.
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