在商用09CuPCrNi耐候钢化学成分的基础上，通过调整合金元素含量，研制出了可直接热轧双相化的Cu-P-Cr-Ni-Mo耐候钢。该钢种变形奥氏体的CCT曲线具有较宽的铁素体析出区，可作为热轧“可行的速度窗口”；铁素体析出区与贝氏体转变区之间存在约80℃的奥氏体亚稳区，可作为热轧“可行的卷取范围”；贝氏体转变区的右侧端部封口，可避免在卷取过程中发生贝氏体转变。根据Cu-P-Cr-Ni-Mo耐候钢的变形奥氏体的CCT曲线，制定了5种热轧双相化工艺，并采用Gleeble-3500热模拟机进行了轧制模拟，制备出了Cu-P-Cr-Ni-Mo热轧双相耐候钢。不同工艺下获得的双相耐候钢组织均为铁素体基体及其上呈岛状分布的马氏体，马氏体体积分数为17%~28%。
Cu-P-Cr-Ni-Mo weathering steel, in which dual-phase microstructures can be obtained by directly hot-rolling, was developed through readjustment of alloy elements based on the composition of weathering steel 09CuPCrNi. The wide temperature range of ferrite precipitation in the continuous cooling transformation (CCT) diagram of the hot deformed austenite can be applied as cooling speed windows. And between the precipitation range of ferrite and the transformation range of bainite, a wide metastable-austenite range of 80℃ exists, which can be held as coiling windows. The bainite transformation also can be avoided during the coiling process for the enveloped bainite transformation range in the CCT diagram. Based on the CCT diagram of deformed austenite, dual-phase weathering steel Cu-P-Cr-Ni-Mo is produced through simulated continuous hot-rolling on Gleeble-3500 thermal simulator. The microstructure of the hot-rolled dual-phase weathering steel Cu-P-Cr-Ni-Mo under different conditions is characterized as irregular distribution of island-shaped martensite in the matrix of equiaxed ferrite grains.
参考文献
| [1] | |
| [2] | C. Zhang, D. Cai, B. Liao. Microstructure and Mechanical Properties of Dual-Phase Weathering Steel 09CuPTiRe[J]. Journal of Materials Science, 2004, 39(13):4393.[2] 张春玲, 蔡大勇, 廖波. 09CuPCrNi耐候钢的双相化研究[J].钢铁, 2004, 39(3):50. (Zhang Chunling, Cai Dayong, Liao Bo. Study on the Dual-Phase Treatment of Steel 09CuPCrNi [J]. Steel and Iron, 2004, 39(3):50. )[3] 戴雅康, 杜林秀, 戚正风. 耐候钢的双相化处理-耐候双相钢[J].机械工程材料, 1992, 16(3):38. (Dai Yakang, Du Linxiu, Qi Zhengfeng. Dual-Phase Treatment of Weathering Steel-Dual-Phase Weathering Steel [J]. Materials for Mechanical Engineering, 1992, 16(3): 38.)[4] 樊云昌. 双相钢及其在铁路客、货车辆上的应用前景[J]. 石家庄铁道学院学报, 1999, 12(3): 57. (Fan Yunchang. Dual-Phase Steels and the Prospects for Their Applications in Manufacturing of Railway Stocks [J]. Journal of Shijiazhuang Railway Institute, 1999, 12(3): 57.)[5] A. P. Coldren, G. Tither. Development of a Mn-Si-Cr-Mo As-Rolled Dual-Phase Steel [J]. Journal of Metals, 1978, 4: 6.[6] T. Gréday, H. Mathy and P. Messien. About Different Ways to Obtain Multiphase Steels [A]. R.A.Kot, J.W.Morris. Structure and Properties of Dual-Phase Steels [C]. New York: The Metallurgical Society of AIME, 1979. 260-280.[7] 张久信, 王明微, 谭佃龙. 640MPa级直接热轧双相钢SX65的研制[J]. 鞍钢技术, 1994, 6(4):1. (Zhang Jiuxin, Wang Mingwei, Tan Dianlong. Development of Directly Hot-Rolling Dual-Phase Steel SX65 with Grade 640MPa [J]. Technology of Angang, 1994, 6(4):1.)[8] 宋义全. 0.1C-1.5Si-1.5Mn-0.4Cr热轧双相钢的相变和组织[J].特殊钢, 2001, 22(5):16. (Song Yiquan. Transformation and Structure of As-Hot Rolled Dual Phase Steel 0.1C-1.5Si-1.5Mn-0.4Cr [J]. Special Steel, 2001, 22(5):16.) |
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