鈦稀土復合處理對C-Mn鋼粗晶熱影響區組織及韌性的影響

張圣華; 宋波; 宋明明; 高啟瑞

doi:10.13374/j.issn2095-9389.2017.06.005

鈦稀土復合處理對C-Mn鋼粗晶熱影響區組織及韌性的影響

doi: 10.13374/j.issn2095-9389.2017.06.005

張圣華^1,2,
宋波^1,2, ,,
宋明明³,
高啟瑞^1,2

1) 北京科技大學冶金與生態工程學院, 北京 100083
2) 北京科技大學鋼鐵冶金新技術國家重點實驗室, 北京 100083
3) 武漢科技大學耐火材料與冶金國家重點實驗室, 武漢 430081

基金項目:

國家自然科學基金資助項目(51274269)

詳細信息

中圖分類號: TG142.1
計量
- 文章訪問數: 806
- HTML全文瀏覽量: 270
- PDF下載量: 19
- 被引次數: 0
出版歷程
- 收稿日期: 2016-10-10

Influence of Ti-rare earth addition on microstructure and toughness of coarse grain heat-affected zone in C-Mn steel

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
3) State Key Laboratory for Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

摘要

摘要: 利用Gleeble-1500D熱模擬機進行焊接熱影響區熱循環模擬實驗,研究了在焊接熱輸入為65 kJ·cm^-1時稀土單獨處理和鈦稀土復合處理對C-Mn鋼粗晶熱影響區組織及沖擊韌性的影響,并利用掃描電鏡觀察和分析了實驗鋼中的夾雜物和沖擊斷口形貌,利用光鏡觀察了熱循環模擬后實驗鋼中的微觀組織.實驗結果表明:稀土單獨處理和鈦稀土復合處理的試樣微觀組織分別主要是晶界鐵素體+塊狀鐵素體+針狀鐵素體和晶界鐵素體+晶內針狀鐵素體.經稀土單獨處理的試樣中夾雜物為La₂O₂S+錳鋁硅酸鹽+MnS復合夾雜;鈦稀土復合處理的試樣中的夾雜主要是La₂O₂S+TiO_x+錳鋁硅酸鹽+MnS復合夾雜.鈦稀土復合處理鋼中的復合夾雜更細小,有利于形成細小的晶內針狀鐵素體.鈦稀土復合處理極大地改善了實驗鋼的焊接熱影響區低溫沖擊韌性,比稀土單獨處理對試樣的沖擊性能提升效果更好.
- 碳-錳鋼 /
- 粗晶熱影響區 /
- 針狀鐵素體 /
- 顯微組織 /
- 沖擊韌性
Abstract: The influences of rare earth (RE) and Ti-RE complex treatment on the microstructures and toughness in the coarse grain heat-affected zone (CGHAZ) of C-Mn steel were investigated using a Gleeble-1500D thermal simulator with input heat energy of 65 kJ·cm^-1. The inclusions and impact fracture morphology were observed and analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX), and the microstructure was characterized using an optical microscope (OM). The results show that the microstructures in the CGHAZs of RE-and Ti-RE-treated samples are mainly grain boundary ferrite (GBF) + polygonal ferrite (PF) + intragranular acicular ferrite (IAF) and grain boundary ferrite + intragranular acicular ferrite, respectively. Inclusions in the RE-treated specimen are La₂O₂S + Mn-Al-Si-O + MnS, while those in the Ti-RE-treated specimen are La₂O₂S + TiO_x + Mn-Al-Si-O + MnS. The complex inclusions in Ti-RE-treated steel are smaller than those in RE-treated steel, and the size of IAF in Ti-RE-treated steel is smaller. The impact properties of the CGHAZ in Ti-RE-treated C-Mn steel is improved significantly, and the material is tougher than RE-treated steel.
- carbon-manganese steel /
- coarse grain heat-affected zone (CGHAZ) /
- acicular ferrite (AF) /
- microstructure /
- impact toughness

HTML全文

參考文獻(14)

[1]	Capdevila C, García-Mateo C, Chao J, et al. Advanced vanadium alloyed steel for heavy product applications. Mater Sci Technol, 2009, 25(11):1383
[6]	Farrar R A, Harrison P L. Acicular ferrite in carbon-manganese weld metals:an overview. J Mater Sci, 1987, 22(11):3812
[7]	Mills A R, Thewlis G, Whiteman J A. Nature of inclusions in steel weld metals and their influence on formation of acicular ferrite. Mater Sci Technol, 1987, 3(12):1051
[8]	Lee J L, Pan Y T. Effect of sulfur content on the microstructure and toughness of simulated Heat-Affected zone in Ti-Killed steels. Metall Trans A, 1993, 24(6):1399
[9]	Suzuki S, Ichimiya K, Akita T. High tensile strength steel plates with excellent HAZ toughness for shipbuilding:JFE EWEL technology for excellent quality in HAZ of high heat input welded joints. JFE Tech Rep, 2005, 5:24
[10]	Hu J, Du L X, Wang J J, et al. Effect of welding heat input on microstructures and toughness in simulated CGHAZ of V-N high strength steel. Mater Sci Eng A, 2013, 577:161
[11]	Shi M H, Zhang P Y, Wang C, et al. Effect of high heat input on toughness and microstructure of coarse grain heat affected zone in Zr bearing low carbon steel. ISIJ Int, 2014, 54(4):932
[12]	Shim J H, Cho Y W, Chung S H, et al. Nucleation of intragranular ferrite at Ti₂O₃ particle in low carbon steel. Acta Mater, 1999, 47(9):2751
[13]	Byun J S, Shim J H, Cho Y W, et al. Non-metallic inclusion and intragranular nucleation of ferrite in Ti-killed C-Mn steel. Acta Mater, 2003, 51(6):1593
[14]	Chai F, Su H, Yang C F, et al. Nucleation behavior analysis of intragranular acicular ferrite in a Ti-killed C-Mn steel. J Iron Steel Res Int, 2014, 21(3):369
[15]	Song M M, Song B, Hu C L, et al. Formation of acicular ferrite in Mg treated Ti-bearing C-Mn steel. ISIJ Int, 2015, 55(7):1468
[16]	Song M M, Song B, Xin W B, et al. Effects of rare earth addition on microstructure of C-Mn steel. Ironmaking Steelmaking, 2015, 42(8):594
[17]	Nako H, Okazaki Y, Speer J G. Acicular ferrite formation on Tirare earth metal-Zr complex oxides. ISIJ Int, 2015, 55(1):250
[18]	Byun J S, Shim J H, Cho Y W. Influence of Mn on microstructural evolution in Ti-killed C-Mn steel. Scripta Mater, 2003, 48(4):449