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鈮對低碳鋼形變強化相變的影響

Effect of Nb on deformation-enhanced ferrite transformation in low carbon steel

  • 摘要: 利用熱模擬壓縮變形實驗研究了含鈮鋼和相應成分的低碳鋼過冷奧氏體形變強化相變的組織演變規律,探討了鈮在析出狀態時對形變強化相變的影響,進行了轉變動力學曲線的分析.結果表明:形變強化相變之前有Nb(CN)析出可以顯著促進鐵素體形核.含鈮鋼的過冷奧氏體在A3~Ar3之間變形,可以得到平均晶粒尺寸為1.9μm的形變強化相變鐵素體.其轉變動力學與低碳鋼相類似,以形變強化相變為主;在鐵素體轉變基本完成時,含鈮鋼的鐵素體晶粒較細小.

     

    Abstract: The microstructure evolutions during deformation-enhanced transformation of undercooled austenite of Nb-microalloyed steel and low carbon steel with the similar contents of C and Mn were investigated by hot compression simulation experiment. The effect of Nb on the deformation-enhanced ferrite transformation was studied, and the transformation kinetics was analyzed. The results show that Nb(CN) precipitation promotes ferrite nucleation significantly before deformation-enhanced ferrite transformation. Ultra-fine ferrite with a grain size of about 1.9 μm is formed in Nb-microalloyed steel during deformation of undercooled austenite between A3-Ar3. Deformation-enhanced transformation is the dominated process in the early stage of deformation; as ferrite transformation accomplished, the ferrite grain size of Nb-microalloyed steel is smaller than that of low carbon steel.

     

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