700 MPa级高强度耐候钢过冷奥氏体连续冷却相变行为

doi:10.13251/j.issn.0254-6051.2021.07.018

摘要/Abstract

摘要： 采用热模拟试验机研究了添加Ni、Cr、Cu的车厢用微合金化耐候钢的过冷奥氏体连续冷却相变行为,并建立了试验钢的静态和动态CCT曲线。结果表明,在无变形条件下,试验钢在各冷速下均不能获得全铁素体组织,冷却速率为0.2 ℃/s时,室温组织中的铁素体含量最高,为41%,平均晶粒尺寸为36.9 μm;在施加30%变形量的条件下,试验钢在0.2 ℃/s冷速下可获得全铁素体+极少量珠光体组织,平均晶粒尺寸为17.9 μm,具有较好的耐腐蚀能力。当冷却速率在0.2~0.5 ℃/s之间(铁素体+珠光体相变区间),提高冷却速率可以增加试验钢的硬度,在施加30%变形量和0.2 ℃/s冷却速率条件下,试验钢的宏观硬度值达181 HV30。

关键词: 耐候钢, 铁素体, 动态CCT曲线, 硬度

Abstract: Continuous cooling phase transformation behavior of micro-alloyed weathering resistance steel with addition of Ni, Cr, Cu for carriage was studied by means of thermal simulation test machine, and the static and dynamic CCT curves of the tested steel were established. The results show that under the condition of no deformation, not all ferrite microstructure can be obtained at test cooling rates. When the cooling rate is 0.2 ℃/s, the ferrite content in the room temperature after cooling is the highest, which is 41%, and the average grain size is 36.9 μm. Under the condition of deformation of 30%, all ferrite and mintue quantity of pearlite microstructure can be obtained at the cooling rate of 0.2 ℃/s, and the average grain size is 17.9 μm, at which the tested steel has good corrosion resistance. When the cooling rate is in the range of 0.2-0.5 ℃/s (ferrite and pearlite phase transformation), the hardness of the tested steel increases with the rise of cooling rate. Under the condition of deformation of 30% and cooling rate of 0.2 ℃/s, the macrohardness of the tested steel reaches 181 HV30.

Key words: weathering resistance steel, ferrite, dynamic CCT curves, hardness

中图分类号:

TG142.23

霍建生, 阎冬. 700 MPa级高强度耐候钢过冷奥氏体连续冷却相变行为[J]. 金属热处理, 2021, 46(7): 94-97.

Huo Jiansheng, Yan Dong. Continuous cooling transformation behavior of undercooled austenite of 700 MPa high strength weathering resistance steel[J]. Heat Treatment of Metals, 2021, 46(7): 94-97.

参考文献

[1] 于谦. 耐候钢发展现状及展望[J]. 钢铁研究学报, 2007, 19(11): 1-4.
Yu Qian. Development status and prospect of weathering steel[J]. Journal of Iron and Steel Research, 2007, 19(11): 1-4.
[2] 陈付红, 高真凤, 黄维, 等. 国内外铁路车辆用耐候钢板发展现状[J]. 上海金属, 2017, 39(1): 70-74.
Chen Fuhong, Gao Zhenfeng, Huang Wei, et al. Development status of weathering steel plate for railway vehicles at home and abroad[J]. Shanghai Metals, 2017, 39(1): 70-74.
[3] Clover D, Kinsella B, Pejcic B, et al. The influence of microstructure on the corrosion rate of various carbon steels[J]. Journal of Applied Electrochemistry, 2005, 35(2): 139-149.
[4] 郭玉冰. 显微组织对高强微合金钢腐蚀行为的影响[D]. 天津: 天津大学, 2015.
Guo Yubing. Effect of microstructure on corrosion behavior of high strength microalloy steel[D]. Tianjing: Tianjing University, 2015.
[5] Lucio-Garcia M A, Gonzalez-Rodriguez J G, Casales M, et al. Effect of heat treatment on H₂S corrosion of a micro-alloyed C-Mn steel[J]. Corrosion Science, 2009, 51(10): 2380-2386.
[6] Zhao M C, Yang K. Strengthening improvement of sulfide stress cracking resistance in acicular ferrite pipeline steels by nano-sized carbonitrides[J]. Scripta Materialia, 2005, 52(9): 881-886.
[7] Sarkar P P, Kumar P, Manna M K, et al. Microstructural influence on the electrochemical corrosion behavior of dual-phase steel in 3.5%NaC1 solution[J]. Materials Letters, 2005, 59(19/20): 2488-2491.
[8] Manohar P A, Chandra T, Killmore C R. Continuous cooling transformation behaviour of microalloyed steels containing Ti, Nb, Mn and Mo[J]. ISIJ International, 1996, 36(12): 1486-1493.
[9] Calvo J, Jung I H, Elwazri A M, et al. Influence of the chemical composition on transformation behaviour of low carbon microalloyed steels[J]. Materials Science and Engineering A, 2009, 520(1): 90-96.
[10] Cizek P, Wynne B, Davies C, et al. Effect of composition and austenite deformation on the transformation characteristics of low-carbon and ultralow-carbon microalloyed steels[J]. Metallurgical and Materials Transactions A, 2002, 33(5): 1331-1349.
[11] Zhao M C, Yang K, Xiao F R, et al. Continuous cooling transformation of undeformed and deformed low carbon pipeline steels[J]. Materials Science and Engineering A, 2003, 355(1): 126-136.
[12] Chen Y, Zhang D T, Liu Y C, et al. Effect of dissolution and precipitation of Nb on the formation of acicular ferrite/bainite ferrite in low-carbon HSLA steels[J]. Materials Characterization, 2013, 84: 232-239.
[13] Zhang C L, Cai D Y, Wang Y H, et al. Effects of deformation and Mo, Nb, V, Ti on continuous cooling transformation in Cu-P-Cr-Ni-Mo weathering steels[J]. Materials Characterization, 2008, 59(11): 1638-1642.
[14] 徐光. 金属材料CCT曲线测定及绘制[M]. 北京: 化学工业出版社, 2009: 142-144.
Xu Guang. Determination and drawing of CCT curve of metal material[M]. Beijing: Chemical Industrial Press, 2009: 142-144.
[15] Guo J, Shang C J, Yang S W, et al. Weather resistance of low carbon high performance bridge steel[J]. Materials and Design, 2009, 30: 129-134.
[16] Yen H W, Chen P Y, Huang C Y, et al. Interphase precipitation of nanometer-sized carbides in a titanium-molybdenum-bearing low-carbon steel[J]. Acta Materialia, 2011, 59(16): 6264-6274.
[17] 陈俊, 吕梦阳, 唐帅, 等. V-Ti微合金钢的组织性能及相间析出行为[J]. 金属学报, 2014, 50(5): 524-530.
Chen Jun, Lü Mengyang, Tang Shuai, et al. Microstructure, mechanical properties and interphase precipitation behaviors in V-Ti microalloyed steel[J]. Acta Metallurgica Sinica, 2014, 50(5): 524-530.
[18] Funakawa Y, Shiozaki T, Tomita K, et al. Development of high strength hot-rolled sheet steel consisting of ferrite and nanometer-sized carbides[J]. ISIJ International, 2004, 44(11): 1945-1951.