Ti-Mg復合脫氧對鋼熱影響區組織和沖擊性能的影響

宋明明; 宋波; 胡春林; 辛文彬; 宋高陽

doi:10.13374/j.issn2095-9389.2015.07.009

Ti-Mg復合脫氧對鋼熱影響區組織和沖擊性能的影響

doi: 10.13374/j.issn2095-9389.2015.07.009

宋明明^1,2,
宋波^1,2, ,,
胡春林³,
辛文彬^1,2,
宋高陽^1,2

1. 北京科技大學鋼鐵冶金新技術國家重點實驗室, 北京 100083;
2. 北京科技大學冶金與生態工程學院, 北京 100083;
3. 馬鞍山鋼鐵股份有限公司第三鋼軋總廠, 馬鞍山 243011

基金項目:

國家自然科學基金資助項目(51274269)

中央高校基本科研業務費資助項目(FRF-SD-12-010A,FRF-SD-12-010B)

詳細信息

通訊作者:
宋波,E-mail:songbo@metall.ustb.edu.cn

中圖分類號: TG142.1
計量
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- 被引次數: 0
出版歷程
- 收稿日期: 2014-06-15
- 網絡出版日期: 2021-07-10

Effect of Ti-Mg complex deoxidation on the microstructure and impact properties of HAZ in steel

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. No.3 Steelmaking & Rolling Plant of Maanshan Iron & Steel Company Limited, Maanshan 243011, China

摘要

摘要: 利用Gleeble-1500熱模擬試驗機進行焊接熱模擬實驗,研究16Mn鋼經微Ti和Ti-Mg處理后焊接熱影響區組織及沖擊性能的變化,并利用掃描電鏡和能譜分析法觀察和分析實驗鋼的夾雜與沖擊斷口形貌.Ti和Ti-Mg復合處理試樣的熱影響區顯微組織分別主要是晶界塊狀鐵素體+晶界側板條鐵素體和晶內針狀鐵素體+晶界塊狀鐵素體.經Ti處理后鋼中夾雜物主要為5μm左右的TiO_x+MnS復合夾雜,經Ti-Mg復合脫氧后鋼中夾雜物主要為2μm左右Ti-Mg-O+MnS組成的復合夾雜,且后者明顯細化了鋼中夾雜物尺寸.Ti-Mg復合脫氧試樣中存在大量細小夾雜顆粒,一方面可釘扎裂紋,另一方面誘導形成了使大量針狀鐵素體,大焊接熱輸入條件下Ti-Mg復合脫氧試樣熱影響區沖擊韌性明顯強于單獨Ti處理的試樣.
- 碳錳鋼 /
- 脫氧 /
- 熱影響區 /
- 顯微組織 /
- 沖擊性能 /
- 針狀鐵素體 /
- 熱模擬
Abstract: The effects of micro Ti and Ti-Mg on the microstructure and impact properties of welding heat affected zones(HAZ)in 16 Mn steel were studied by welding thermal simulation on a Gleeble-1500 hot simulator. The composition of inclusions and the Charpy impact fracture morphologies of the test steels were analyzed by scanning electron microscopy with energy dispersive spectrometry. The microstructures of HAZ in the Ti and Ti-Mg treated steels are mainly grain boundary allotriomorphic ferrite(GBF) + ferrite side plate(FSP) and GBF + intragranular acicular ferrite(IAF),respectively. Inclusions in the HAZ of the Ti-treated steel are TiO_x+ MnS with the size of about 5 μm,while inclusions in the HAZ of the Ti-Mg treated steel are Ti-Mg-O + MnS with the size of about 2 μm. The particle size of the latter tested steel is smaller than that of the former one significantly. The HAZ of the Ti-Mg-treated steel has a lot of fine particles which pin cracks and induce the formation of a large number of IAF,leading to that the impact properties of the Ti-Mg-treated steel is better than those of the Ti-treated steel after experiencing large heat input welding.
- carbon manganese steel /
- deoxidation /
- heat affected zone /
- microstructure /
- impact properties /
- acicular ferrite /
- thermal simulation