Effect of Mo in V-microalloyed Precipitating-strengthen High Strength Steel
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摘要: 以不同Mo含量V微合金钢为试验钢，通过等温析出热模拟、TEM试验、Thermo-calc软件计算等手段，研究了Mo元素对V微合金钢在低温贝氏体区析出行为的影响规律；通过对试验钢的实验室试轧及力学性能检测，研究了Mo对V微合金钢力学性能的影响。结果表明：Mo元素的添加可以显著提高析出物的析出潜能，对于轧后600℃×40 min保温试样，Mo含量从0增至0.6%，析出体积分数可由0.019%增加到0.025%；在V微合金钢中添加Mo元素能够显著提高试验钢的强度，添加0.6% Mo的试验钢屈服强度达667 MPa，抗拉强度达803 MPa，比不含Mo的试验钢分别提高了113 MPa和119 MPa。Abstract: The effects of Mo element on the precipitation of low temperature bainite zone in V microalloyed steels were investigated for the V microalloyed steels,by means of isothermal precipitation simulations,TEM,calculation of Thermo-calc software.And the effect of Mo element on the mechanical properties of V microalloyed steel was investigated by hot rolling experiment and mechanical properties test in laboratory.The results show that the addition of Mo can significantly improve the precipitation potential.When the Mo content increases from 0% to 0.6%,the volume fraction of precipitates can be increased from 0.019% to 0.025% for the sample held at 600℃ for 40 min.The addition of Mo element can significantly improve the strength of the V microalloyed steel.The yield strength and tensile strength of the steel with 0.6% Mo element are 667 MPa and 803 MPa,respectively, which are 113 MPa and 119 MPa more than these of the steel without Mo addition.
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Key words:
- high strength steel /
- V microalloyed /
- Mo element /
- precipitation /
- mechanical properties
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