Continuous Cooling Transformation of Supercooled Austenite of 46MnVS6 Non-quenched and Tempered Steel
-
摘要: 采用淬火膨胀仪、光学显微镜、维氏硬度计等研究了完全奥氏体化46MnVS6非调质钢经不同冷却速率冷却至室温后的显微组织和显微硬度,测定了其过冷奥氏体连续冷却转变(CCT)曲线,探讨了合金元素及冷却速率对过冷奥氏体连续冷却相变的影响。结果表明:46MnVS6钢的CCT曲线可分为高温转变区域、中温转变区域和低温转变区域,且中、低温转变区域互相分离;当冷却速率小于2℃·s-1时,组织主要为铁素体和珠光体,随着冷却速率的增大,铁素体和珠光体含量减少,平均晶粒尺寸减小,马氏体含量增加,当冷却速率大于5℃·s-1时,组织主要为马氏体;随着冷却速率从0.5℃·s-1增大至60℃·s-1,46MnVS6钢的显微硬度由285 HV1增至683 HV1。Abstract: The microstructure and micro-hardness of complete austenitization 46MnVS6 non-quenched and tempered steel were analyzed after cooling to room temperature at different cooling rates by using thermal dilatometer, optical microscope and Vickers hardness tester. The continuous cooling transformation (CCT) curves of supercooled austenite were tested. The influence of alloying element and cooling rate on the continuous cooling transformation of supercooled austenite was discussed. The results show that the CCT curve could be divided into high temperature transition region, middle temperature transition region and low termperature transition region, and the middle temperature transition region and low temperature transition region were separated. The microstructure was mainly ferrite and pearlite when the cooling rate was below 2℃·s-1. With the increase of cooling rate, the content and average grain size of ferrite and pearlite decreased, and the content of martensite increased. The main microstructure was martensite when the cooling rate was over 5℃·s-1. With the increase of cooling rate from 0.5℃·s-1 to 60℃·s-1, the micro-hardness of 46MnVS6 steel increased from 285 HV1 to 683 HV1.
-
-
[1] 王荣滨, 雪浪. 非调质钢在汽车中的应用[J]. 上海钢研, 2002(1):31-35. [2] 刘瑞宁, 王福明. 汽车用微合金化非调质钢的进展[J]. 特殊钢, 2006, 27(3):39-43. [3] 董成瑞, 任海鹏, 金同哲, 等. 微合金非调质钢[M]. 北京:冶金工业出版社, 2000. [4] 徐光, 王巍, 张鑫强, 等. 金属材料CCT曲线测定及绘制[M]. 北京:化学工业出版社,2009. [5] 文成, 蒋波, 杨忠, 等. 非调质钢C38N2φ170 mm热轧材连续冷却转变的研究[J]. 特殊钢, 2014,35(1):57-60. [6] 李智,王国栋, 刘相华, 等. 贝氏体型非调质钢热变形奥氏体的连续冷却转变[J]. 钢铁研究学报, 1999,11(6):35-38. [7] 李璟, 商存亮, 王立群, 等. 低碳贝氏体钢连续冷却相变规律研究[J]. 河南冶金,2011,19(3):15-17. [8] 王建安. 金属学与热处理(下册)[M]. 北京:机械工业出版社,1980. [9] 马鸣图. 微合金非调质钢的新发展及其在汽车工业中的应用[J]. 机械工程材料,2006,30(5):5-8.
计量
- 文章访问数: 4
- HTML全文浏览量: 0
- PDF下载量: 1