Effect of vanadium content on microstructure and properties of W6Mo5Cr4Vx high speed steel for bit
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摘要: 在钻头用W6Mo5Cr4Vx高速钢中添加了不同含量的合金元素钒，并进行了显微组织、耐磨损和耐腐蚀性能的测试与分析。结果表明：添加钒有助于提高高速钢的耐磨损和耐腐蚀性能，随钒含量从0增至5%，钢的耐磨损和耐腐蚀性能均先提高后下降。钢中钒含量优选为3%。与不添加钒相比，W6Mo5Cr4Vx（x=3）高速钢的磨损体积减小5.2×10−3 mm3、腐蚀电位正移57 mV。Abstract: In this paper, different content of vanadium was added to W6Mo5Cr4Vx high speed steel for bit, and the microstructure, wear resistance and corrosion resistance were tested and analyzed. The results show that the addition of vanadium can improve the wear resistance and corrosion resistance of high speed steel. With the increase of vanadium content from 0 to 5%, the wear resistance and corrosion resistance of steel increase firstly and then decrease. The optimized vanadium content in experimental steel is 3%. Compared the steel without vanadium addition, the wear volume of W6Mo5Cr4Vx (x=3) high speed steel decreases by 5.2×10−3 mm3, and the corrosion potential shifts positively by 57 mV.
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Key words:
- high speed steel /
- vanadium content /
- wear resistance /
- corrosion resistance /
- microstructure
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图 1 试样显微组织金相照片
Figure 1. Microstructure of the experimental steels with various vanadium contents
图 2 试样耐磨损性能测试结果
Figure 2. Wear resistance test results of experimental steels with various vanadium contents
图 3 试样表面磨损形貌SEM照片
Figure 3. SEM photos of wear surface morphology of experimental steels with various vanadium contents
表 1 W6Mo5Cr4Vx高速钢试样化学成分
Table 1. Chemical compositions of W6Mo5Cr4Vx high speed steel specimens
% 编号 C W Mo Cr V Si Mn 其它元素 Fe 试样1（x=0） 0.9±0.05 6.0±0.2 5.0±0.2 4.0±0.1 0 <0.03 <0.035 <0.3 Bal. 试样2（x=1） 0.9±0.05 6.0±0.2 5.0±0.2 4.0±0.1 1 <0.03 <0.035 <0.3 Bal. 试样3（x=2） 0.9±0.05 6.0±0.2 5.0±0.2 4.0±0.1 2 <0.03 <0.035 <0.3 Bal. 试样4（x=3） 0.9±0.05 6.0±0.2 5.0±0.2 4.0±0.1 3 <0.03 <0.035 <0.3 Bal. 试样5（x=4） 0.9±0.05 6.0±0.2 5.0±0.2 4.0±0.1 4 <0.03 <0.035 <0.3 Bal. 试样6（x=5） 0.9±0.05 6.0±0.2 5.0±0.2 4.0±0.1 5 <0.03 <0.035 <0.3 Bal. 
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表 2 W6Mo5Cr4Vx高速钢耐腐蚀性能测试结果
Table 2. Corrosion resistance test results of W6Mo5Cr4Vx high speed steel specimens
试样编号 钢中钒含量/% 腐蚀电位/V 试样1 0 −0.724 试样2 1 −0.711 试样3 2 −0.692 试样4 3 −0.667 试样5 4 −0.672 试样6 5 −0.679
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