Precipitation Hardening of FeTiP Phase in P-added High Strength IF Steel
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摘要: 分析含磷高強IF鋼中FeTiP相的脫溶行為及對硬度的影響,發現含磷IF鋼的時效硬化現象.實驗表明,550℃時效時硬化效果比較明顯.電鏡和能譜分析表明大量細小的FeTiP相脫溶是產生硬化現象的重要原因.750℃時效時,FeTiP相中Fe:Ti:P(原子比)并不嚴格地符合1:1:1的比例,且在晶界及晶內均有析出.在超低碳高純凈微合金鋼中,如FeTiP相等非碳氮化合物導致的硬化現象值得引起重視.Abstract: The precipitation behavior of FeTiP phase in P-added high strength IF steel, as well as its influence on the hardness were analyzed. The precipitation hardening effect in P-added IF steel was found. The experiment demonstraes that the hardening effect is more obvious during the aging at 550℃. The key reason of the hardening is the fine precipitation of FeTiP phase, which precipitates not only on the grain boundaries but also inside the grains.The atom ratio of Fe:Ti:P of FeTiP phase is not the exact ratio of 1:1:1 during the aging at 750℃. It is believed that the hardening effect induced by non-carbontrides e. g. FeTip in high purity and ultra-low carbon micro-alloyed steel should be investigated further.
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Key words:
- precipitation hardening /
- aging /
- FeTiP phase /
- IF steel
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