Effect of water quenching processing parameters on the mechanical properties of a cold-rolled C-Mn-containing steel sheet  

作　　者：ZHU Xiaodong BAO Ping XUE Peng LI Wei 

机构地区：[1]Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201999,China [2]State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel),Shanghai 201999,China [3]Sales Department of Automotive Steel Sheets,Baosteel & NSC Automotive Steel Sheets Co.,Ltd.,Shanghai 201900,China

出　　处：《Baosteel Technical Research》2019年第3期19-26,共8页宝钢技术研究（英文版）

摘　　要：Cold-rolled advanced high-strength steel sheets have become the material of choice for the automotive industry because of their unique attributes of high strength and balanced mechanical properties.High-hydrogen gas jet cooling and water quenching are the most commonly used ultrafast cooling technologies for producing martensite-containing high-strength steel sheets.The water quenching technology ensures the fastest industrial cooling rate of 1 000 K/s;therefore,it has the highest potential with respect to saving alloys.In this study,the water quenching of a C-Mn-containing steel sheet is simulated during continuous annealing to investigate the effect of water quenching and tempering parameters on its mechanical properties.The results reveal that at low quenching temperatures,the strength of the steel sheet decreases as the soaking temperature increases.However,at high quenching temperatures,a high soaking temperature corresponds to increased strength after quenching,regardless of whether the material was austenitized in the single austenite zone or the inter-critical zone.Therefore,a high quenching temperature always results in a high strength and a high yield ratio after quenching.Low-temperature overaging(tempering) considerably influences the yield strength and yield ratio,and the extent of this influence is correlated with the soaking temperature.Cold-rolled advanced high-strength steel sheets have become the material of choice for the automotive industry because of their unique attributes of high strength and balanced mechanical properties. High-hydrogen gas jet cooling and water quenching are the most commonly used ultrafast cooling technologies for producing martensite-containing high-strength steel sheets. The water quenching technology ensures the fastest industrial cooling rate of 1 000 K/s; therefore,it has the highest potential with respect to saving alloys. In this study,the water quenching of a C-Mn-containing steel sheet is simulated during continuous annealing to investigate the effect of water quenching and tempering parameters on its mechanical properties. The results reveal that at low quenching temperatures,the strength of the steel sheet decreases as the soaking temperature increases. However,at high quenching temperatures,a high soaking temperature corresponds to increased strength after quenching,regardless of whether the material was austenitized in the single austenite zone or the inter-critical zone. Therefore,a high quenching temperature always results in a high strength and a high yield ratio after quenching. Low-temperature overaging( tempering) considerably influences the yield strength and yield ratio,and the extent of this influence is correlated with the soaking temperature.

关 键 词：water quenching cold-rolled STEEL SHEET C-Mn-containing STEEL 

分 类 号：TF[冶金工程]