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首页> 外文期刊>ISIJ international >Effect of Nb on the Proof Strength of Ferritic Stainless Steels at Elevated Temperatures
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Effect of Nb on the Proof Strength of Ferritic Stainless Steels at Elevated Temperatures

机译：铌对高温下铁素体不锈钢耐久强度的影响

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摘要

The effect of Nb on the high temperature proof strength of 0.46% Nb-added ferritic stainless steel was studied from the viewpoints of solid solution strengthening, precipitation strengthening, and precipitation strengthening during tensile test and/or preceding hold time. The results obtained were as follows. (1) The increase in high temperature proof strength in Nb-added ferritic stainless steel is particularly remarkable at around 700℃ in comparison with that in Ti-added steels. (2) After aging treatment for 2 h at 700℃, in addition to the approximately 0.14% content of coarse Nb carbides and nitrides which had precipitated before this aging treatment, fine Fe_2Nb Laves phase particles with a size of 0.02 μm precipitated out in an amount of approximately 0.3%, and virtually no solid solution Nb existed in the steel. The 700℃ proof strength in this condition showed a value near the 700℃ proof strength before the aging treatment, that is, when approximately 0.3 % solid solution Nb was present. (3) When aging treatment is performed at 700℃ for 2 h or more, virtually all the added Nb precipitates out. The coarsening of the Fe_2Nb laves phase particles within the range of 0.02-0.05 μm during aging at 700℃ greatly decreases the high temperature proof strength at 700℃. (4) Cold rolled steel sheets of Nb-added ferritic stainless steel are normally manufactured by annealing at a temperature of 900℃ or higher in order to cause recrystallization. Accordingly, before measurement of the proof strength at 700℃, the steel contains a large quantity of solid solution Nb. The phenomenon of particularly high strength at 700℃ is considered to be attributable to the precipitation of this solid solution Nb as a fine Fe_2Nb Laves phase during the tensile test and/or preceding hold time.
机译：从固溶强化，析出强化，拉伸试验时及/或之前的保持时间的析出强化的观点出发，研究了Nb对0.46％添加Nb的铁素体系不锈钢的耐高温强度的影响。获得的结果如下。 （1）与添加Ti的钢相比，添加Nb的铁素体不锈钢在700℃左右的耐高温强度的提高特别显着。 （2）在700℃时效处理2小时后，除约0.14％的粗Nb碳化物和氮化物在该时效处理之前析出外，还有0.02μm尺寸的Fe_2Nb Laves细相颗粒析出。含量约为0.3％，钢中几乎不存在固溶Nb。在该条件下的700℃耐力强度显示出接近时效处理之前的700℃耐力强度的值，即，当存在约0.3％固溶Nb时。 （3）在700℃下进行2小时以上的时效处理时，几乎所有添加的Nb都会析出。 Fe_2Nb Laves相颗粒在700℃时效时的粗化在0.02-0.05μm范围内会大大降低700℃时的耐高温强度。 （4）通常通过在900℃以上的温度下进行退火以引起再结晶来制造添加了Nb的铁素体系不锈钢的冷轧钢板。因此，在测定700℃的极限强度之前，钢中含有大量的固溶Nb。认为在700℃时强度特别高的现象是由于在拉伸试验和/或之前的保温时间内，这种固溶Nb以细的Fe_2Nb Laves相形式析出。

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