Influence of carbon content on the formation of intragranular ferrite in isothermally treated medium-carbon vanadium-microalloyed steels
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摘要: 研究了碳質量分數分別為0.26%,0.33%和0.42%的三種含釩微合金鋼在600,550,500和450℃下等溫處理時碳對晶內鐵素體形成的影響,測量了不同等溫溫度處理后鋼的維氏硬度、500℃下晶界和晶內鐵素體的納米硬度,并探討了晶內鐵素體的形核位置.結果表明:在相同溫度下等溫處理時,隨著鋼中碳含量的增高,鋼中非共析鐵素體的含量降低,鐵素體晶粒的尺寸減小,鋼的硬度升高.在500℃等溫處理后,晶界鐵素體的納米硬度遠高于晶內鐵素體的納米硬度;且隨著碳含量的增高,晶界和晶內鐵素體的納米硬度都隨之升高,但各實驗鋼中晶內鐵素體的納米硬度相差不大.適當的夾雜物和先析出晶內鐵素體都可以作為形核位置誘導晶內鐵素體析出.Abstract: Three medium-carbon vanadium-microalloyed steels were designed and experimentally prepared, with carbon contents of 0.26%, 0.34% and 0.42%. The effect of carbon content on the formation of intragranular ferrite (IGF) in the steels isothermally treated at 600, 550, 500 and 450℃ were studied. Vickers hardness test was carried out for the steels isothermally treated at different temperatures. The nano-hardness of grain boundary ferrite (GBF) and IGF was also measured. Nucleation sites of IGF were then discussed. The results showed that the amount of non-eutectoid ferrite increased, the grain size of ferrite decreased, and the hardness was enhanced with increasing carbon content, if isothermally treated at the same temperature. In samples isothermally treated at 500℃, the nano-hardness of GBF was found higher than that of IGF. The nano-hardness of both GBF and IGF increased with the increase of carbon content, but IGF's varied little. It was also found that appropriate inclusions and pre-nucleated IGF could be nucleation sites of IGF.
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