簡介概要

低碳Nb微合金鋼中Nb溶質拖曳和析出相NbC釘扎對再結晶晶粒長大的影響

來源期刊:金屬學報2010年第7期

論文作者:付立銘 單愛黨 王巍

文章頁碼:832 - 837

關鍵詞:晶粒長大; 析出相釘扎; 溶質拖曳; 低碳Nb微合金鋼

Key words:grain growth; precipitates pinning; solute drag; low carbon Nb-microalloyed steel

摘    要:通過理論計算并結合實驗研究了低碳Nb微合金鋼中NbC析出相與Nb固溶原子共同作用對再結晶后奧氏體晶粒長大的影響.結果表明,Nb的溶質原子拖曳與NbC析出相釘扎共同作用阻礙晶粒長大晶界的遷移,高溫時NbC析出相的釘扎起主要作用,Nb的溶質拖曳效應并不明顯,而相對低溫時Nb拖曳對晶粒長大產生明顯地抑制作用,理論計算與實驗結果吻合良好;溶質原子拖曳和析出相的釘扎對抑制晶粒長大的效力可以用p因子來表征,當p=0時,以NbC析出的Nb與固溶Nb的量之比達到最優,抑制晶粒長大效果最好,當p>0時,析出相的釘扎能更有效地阻礙晶粒長大,而p<0時,溶質原子的拖曳對抑制晶粒的長大更有效;在常規熱軋溫度區間或者奧氏體化溫度區間內,只有尺寸不大于10 nm的細小的NbC析出相對再結晶后的晶粒長大才能起到較好抑制作用.

Abstract: A kinetic equation for austenite grain growth has been derived concerning the mutual effect of NbC and Nb solute in low carbon Nb-microalloyed steels.It is shown that both solute drag of Nb in solid solution and pinning of NbC particles inhibit the grain boundary migration during grain growth after recrystallization in low carbon Nb-microalloyed steels.At high temperatures the NbC pinning plays a dominate role for retarding the austenite grain growth with less Nb solute drag effect.An obvious Nb solute drag restraint was,however,observed at relatively low temperatures. Also,the theoretical calculations are in good agreement with experimental results.The effectiveness of drag effect of soluble atoms and pinning effect of precipitates can be characterized by a p factor.The pinning of precipitates and solute drag of soluble atoms are more effective for suppressing grain growth as p>0 and p<0,respectively.And the ratio of Nb in solute and Nb in precipitate as p=0 reaches the priority and most effectively retards the grain growth.In the traditional hot rolling or austenitizing temperature range,a strong suppression for grain growth after recrystallization could be obtained due to those fine NbC particles smaller than 10 nm in Nb-microalloyed steels.



詳情信息展示

低碳Nb微合金鋼中Nb溶質拖曳和析出相NbC釘扎對再結晶晶粒長大的影響

付立銘1,單愛黨1,王巍2

(1.上海市上海交通大學材料科學與工程學院
2.寶山鋼鐵股份有限公司研究院)

摘 要:通過理論計算并結合實驗研究了低碳Nb微合金鋼中NbC析出相與Nb固溶原子共同作用對再結晶后奧氏體晶粒長大的影響.結果表明,Nb的溶質原子拖曳與NbC析出相釘扎共同作用阻礙晶粒長大晶界的遷移,高溫時NbC析出相的釘扎起主要作用,Nb的溶質拖曳效應并不明顯,而相對低溫時Nb拖曳對晶粒長大產生明顯地抑制作用,理論計算與實驗結果吻合良好;溶質原子拖曳和析出相的釘扎對抑制晶粒長大的效力可以用p因子來表征,當p=0時,以NbC析出的Nb與固溶Nb的量之比達到最優,抑制晶粒長大效果最好,當p>0時,析出相的釘扎能更有效地阻礙晶粒長大,而p<0時,溶質原子的拖曳對抑制晶粒的長大更有效;在常規熱軋溫度區間或者奧氏體化溫度區間內,只有尺寸不大于10 nm的細小的NbC析出相對再結晶后的晶粒長大才能起到較好抑制作用.

關鍵詞:晶粒長大; 析出相釘扎; 溶質拖曳; 低碳Nb微合金鋼

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