Study on Microstructure and Properties of V-Ti-N Weathering Steel
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摘要: 采用真空感应炉、热模拟试验机、ICP发射光谱仪、光学显微镜、TEM和电子拉伸试验机等设备，研究了V-Ti-N耐大气腐蚀钢（0% V、0.05% V、0.10% V和0.15% V）的动态CCT曲线、析出钒、晶粒尺寸和强度。结果表明：在耐大气腐蚀钢中添加0.10% V，对CCT曲线的影响有限，贝氏体转变温度都低于600℃；V-Ti-N耐大气腐蚀钢的晶粒尺寸为6.2~7.8μm，产生了101~175 MPa的沉淀强化，屈服强度随着钒氮积的增加而升高，但强化效率逐渐降低；V-Ti-N微合金化较适合于生产400 MPa和450 MPa级高强度耐大气腐蚀钢，此时，钒含量应小于0.10%。
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关键词:
- 耐大气腐蚀钢 /
- V-Ti-N微合金化 /
- 显微组织 /
- 力学性能
Abstract: The dynamic CCT diagrams, precipitated V, grain size and strength for V-Ti-N weathering steels containing 0%V, 0.05%V, 0.10%V and 0.15%V respectively have been examined.In the study, the equipments such as vacuum induction furnace, hot simulation test, ICP emission spectrometer, optical microscope, TEM and electronic tensile tester were used.The results show as follows:addition of 0.10%V into weathering steel has a limited effect on dynamic CCT diagrams and Bs temperature of bainite transformation for 0%V and 0.10%V steel is below 600℃;the grain size of V-Ti-N weathering steels is 6.2~7.8 μm and make a contribution of 101~175 MPa to precipitation strengthening.Yield strength increases with the increase of V×N product, but the strengthening efficiency decreases gradually;V-Ti-N micro-alloying is better fit for development of 400 MPa and 450 MPa high strength weathering steel for which V content should be less than 0.10%.-
Key words:
- weathering steel /
- V-Ti-N micro-alloying /
- microstructure /
- mechanical properties
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