Precipitation behavior of V- N microalloyed steel at the normalizing process
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摘要: 采用物理化學相分析、高分辨透射電鏡等手段研究V-N微合金化鋼在正火過程中第二相行為,并進行相應的理論計算,討論該行為對材料性能產生的影響.正火加熱保溫過程中,V-N鋼有約32.9%的V(C,N)未溶解,阻止奧氏體晶粒長大.在正火冷卻過程中,未溶解的V(C,N)誘導晶內鐵素體形核,細化鐵素體晶粒,而溶解的V(C,N)重新析出,起到析出強化作用.V(C,N)析出相行為的變化導致材料力學性能的改變.與熱軋態V-N鋼相比,正火態V-N鋼細晶強化貢獻值增加31 MPa,而析出強化貢獻值減少45 MPa.Abstract: The precipitation behavior of V-N microalloyed steel at the normalizing process was studied by physicochemical phase analysis and high resolution transmission electron microscopy. The effect of this precipitation behavior on the mechanical properties of the steel was discussed by theoretical calculations. At soaking of the normalizing process,32.9% of V(C,N) precipitations keep undissolved into austenite,and they prevent austenite from growing up. At the subsequent cooling process,the undissolved V(C,N)precipitations induce intra-granular ferrite nucleating,which can refine ferrite grains; besides,the dissolved V(C,N) precipitations re-precipitate and play the role of precipitation strengthening. Compared with the hot-rolled steel,the normalized steel gains a 31 MPa increment in grain-refined strengthening but a 45 MPa decrease in precipitation strengthening.
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Key words:
- steel heat treatment /
- normalizing /
- microalloying /
- precipitation /
- grain refinement /
- strengthening
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