Influence of Vanadium on Microstructure and Properties of High Nitrogen 20MnSi Steel
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摘要: 探讨了不同钒含量对高氮20MnSi螺纹钢组织、力学性能的影响,利用扫描电镜对试验钢组织和断口形貌进行微观分析。结果表明:随着钒含量的增加,高氮20MnSi螺纹钢晶粒由8.6μm变化到1.9μm,但渗碳体析出不平直;当钒的含量为0.039%时,会使屈服强度达到944 MPa,抗拉强度1 100 MPa,伸长率26%,屈强比0.85,显著提高了螺纹钢的力学性能;钒的增加使高氮20MnSi螺纹钢脆性区转变为塑性区,当钒含量为0.047%时,试验钢的脆性区消失。Abstract: The effect of vanadium on the microstructure and mechanical properties of 20 MnSi thread steel with high content of nitrogen was studied,and the fracture morphology of the tested samples was analyzed by scanning electron microscopy. The results show that the grain size of 20MnSi thread steel decreases from 8.6 μm to 1.9 μm with increasing content of vanadium but the precipitates of cementite are not flat and straight. Mechanical properties of the thread steel containing 0.039% vanadium are significantly improved with yield strength reaching 944 MPa,1 100 MPa of tensile strength,26% of elongation and yield ratio 0.85. The brittle zone of 20MnSi thread steel is found to transform into plastic zone with increasing content of vanadium and disappear with 0.047% vanadium.
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Key words:
- 20MnSi /
- high nitrogen /
- vanadium /
- microstructure /
- mechanical properties
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