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Factors controlling ambient and high temperature yield strength of ferritic stainless steel susceptible to intermetallic phase formation

机译：控制易形成金属间相的铁素体不锈钢的环境高温屈服强度的因素

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摘要

The microstructure evolution in Ti-Nb dual stabilized ferritic steel at high service temperature was simulated with heat treatments at 600 degrees C for up to 120 h. Thermodynamic calculations indicated that, in addition to conventional MX type carbides and nitrides containing Nb and Ti, heat treatment at high temperature can promote the formation of intermetallic Laves, Chi (chi) and sigma (sigma) phases. During the heat treatment, Laves (FeSi2NbMo) and sigma (FeCrMo) phases formed. The effect of the intermetallic phases on the ambient and high temperature yield strength (sigma(y)) was investigated through a comprehensive breakdown of the mechanisms contributing to strengthening, i.e. grain boundary, dislocation, precipitation and solid solution strengthening, the last two of which are influenced by the precipitation of the Laves and a phases. On the basis of a regression analysis of atomic radius and shear modulus misfit with respect to Fe, the solid solution strengthening coefficient of Nb in alpha-Fe was predicted to be 16 MPa/at%. The coefficient was experimentally validated by measuring the yield strengths for two conditions with different amounts of Nb in solution. The present value is considered more reasonable than the 4320 MPa/wt% (approximately 7187 MPa/at%) presented earlier in the literature. Heat treatment at 600 degrees C raised the yield strength at ambient temperature, due to intermetallic precipitation strengthening. However, the opposite was true regarding the high temperature yield strength, which suggests that the effects of precipitation strengthening are relatively smaller and solid solution strengthening greater at elevated temperatures.
机译：模拟了Ti-Nb双稳定铁素体钢在高使用温度下的组织演变，并在600摄氏度下进行了长达120小时的热处理。热力学计算表明，除了含有Nb和Ti的常规MX型碳化物和氮化物以外，高温热处理还可以促进金属间Laves相，Chi（chi）和Sigma（sigma）相的形成。在热处理过程中，形成了Laves（FeSi2NbMo）和Sigma（FeCrMo）相。通过全面分解有助于强化的机制，即晶界，位错，析出和固溶强化，研究了金属间相对环境和高温屈服强度（sigma（y））的影响。受Laves和a相的沉淀作用。根据对Fe的原子半径和剪切模量失配的回归分析，预计α-Fe中Nb的固溶强化系数为16 MPa / at％。通过测量溶液中Nb量不同的两种条件下的屈服强度，可以通过实验验证该系数。该值被认为比文献中先前提出的4320 MPa / wt％（约7187 MPa / at％）更合理。由于金属间沉淀强化，在600摄氏度下进行的热处理提高了环境温度下的屈服强度。但是，高温屈服强度却相反，这表明在高温下，析出强化的影响相对较小，而固溶强化则较大。

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