Study on microstructure and properties of new titanium bearing high strength building steel
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摘要: 进行了不同钛含量的Fe-Si-Mn-C-Ti系建筑高强钢显微组织，以及耐腐蚀性能和耐磨损性能的测试与分析。结果表明，添加合金元素钛，有助于细化试验钢的内部组织，提高耐腐蚀性能和耐磨损性能。随钢中钛含量从0逐步增至0.15%，试验钢的内部组织先细化后粗化，腐蚀电位先正移后负移，磨损体积先减小后增大，耐腐蚀性能和耐磨损性能先提高后下降。与不添加钛相比，添加0.06%钛含量时，试验钢的腐蚀电位正移91 mV，磨损体积减小9×10−3 mm3，耐腐蚀性能显著提高。不添加钛时，Fe-Si-Mn-C试验钢中由基体Fe和M3C碳化物组成；当合金元素钛含量0.02%～0.06%时，试验钢由基体Fe、TiC和M3C碳化物组成；当合金元素钛含量0.15%时，试验钢由基体Fe、TiC、TiN和M3C碳化物组成。Abstract: In this paper, the microstructure, corrosion resistance and wear resistance of Fe-Si-Mn-C-Ti high-strength building steel with different titanium content were tested and analyzed. The results show that the addition of alloy element titanium is helpful to refine the internal structure and improve the corrosion resistance of the steel. With the increase of Ti content from 0 to 0.15%, the internal structure of the test steel is refined firstly and then coarsened, the corrosion potential firstly shifts to positive and then negative, the wear volume firstly decreases and then increase, the corrosion resistance and wear resistance increases firstly and then decreases. When 0.06% Ti is added, the corrosion potential of the steel is shifted forward by 91 mV, the wear volume decreases by 9×10−3 mm3, and the corrosion resistance is significantly improved. Fe-Si-Mn-C steel without titanium consists of matrix Fe and M3C carbides. When the content of Ti is 0.02%–0.06%, the steel consists of matrix Fe, TiC and M3C carbides. When the content of Ti is 0.15%, the steel consists of matrix Fe, TiC, TiN and M3C carbides.
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Key words:
- high-strength building steel /
- Ti /
- microstructure /
- corrosion resistance /
- wear resistance
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图 1 试验钢显微组织照片
(a) 1#试样；(b) 2#试样；(c) 3#试样；(d) 4#试样
Figure 1. Microstructure of the tested steel
图 3 试验钢电化学腐蚀试验后的表面形貌
(a) 1#试样；(b) 2#试样；(c) 3#试样；(d) 4#试样
Figure 3. Surface morphology of the tested steels after electrochemical corrosion test
表 1 试验钢化学成分
Table 1. Chemical compositions of the tested steel
% 试样编号 C Si Mn P S N Ti Fe 1# 0.05 0.20 1.52 <0.005 <0.005 <0.005 0 Bal. 2# 0.05 0.20 1.52 <0.005 <0.005 <0.005 0.02 Bal. 3# 0.05 0.20 1.52 <0.005 <0.005 <0.005 0.06 Bal. 4# 0.05 0.20 1.52 <0.005 <0.005 <0.005 0.15 Bal. 
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表 2 试验钢电化学腐蚀试验结果
Table 2. Corrosion results of the tested steels
试样编号 合金元素钛含量/% 腐蚀电位/V 1# 0 -0.615 2# 0.02 -0.598 3# 0.06 -0.524 4# 0.15 -0.581
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表 3 试验钢磨损试验结果
Table 3. Test results of the tested steels’ wear resistance
试样编号 合金元素钛含量/% 磨损体积/mm3 1# 0 34×10−3 2# 0.02 31×10−3 3# 0.06 25×10−3 4# 0.15 28×10−3
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