Nb(C,N)溶解对高铌奥氏体晶粒长大行为的影响
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摘要
为了定量研究铌对高铌钢加热过程奥氏体晶粒长大的影响,采用化学溶解过滤分离及电感耦合等离子光谱测定不同加热温度两种试验钢固溶铌质量分数,并对比研究了奥氏体晶粒长大行为。结果表明,在低温条件下,低铌钢固溶铌质量分数高于高铌钢;随加热温度升高,高铌钢固溶铌质量分数快速增加,但即使在1 300℃时,铌也不能完成固溶,少量铌存在于(Ti,Nb)(N,C)析出相中;奥氏体晶粒快速长大的温度与固溶铌质量分数快速增加的温度有关。随铌质量分数由0.082%增加到0.120%,奥氏体晶粒快速长大的临界温度由1 050升高到1 150℃。高铌钢在1 150～1 250℃加热温度范围内,奥氏体晶粒尺寸小于100μm。
In order to investigate the effect of Nb content of high-Nb steels on the growth of austenite grain growth during heating process.Means of chemical dissolution,filtration and separation and inductively coupled plasma spectrum were taken to examine the content of dissolved Nb in two high-Nb-low-Ti microallying steels at different temperatures.And a comparative study of the austenite grain growth behavior was carried out.Results showed that the mass fraction of dissolved Nb in low-Nb steel was higher than that in the high-Nb steel at lower heating temperatures.With heating temperature increasing,the content of dissolved Nb in high-Nb steel quickly increased.However,even if heating temperature gets to 1 300℃,the Nb can not be completely dissolved.A small amount of Nb existed in(Ti,Nb)(N,C)precipitate.The temperature of the austenite grain quick growth was related to the temperature at which the content of dissolved Nb quickly increased.As the mass fraction of Nb in steels increased from0.082%to 0.120%,the critical temperature of the austenite grain quick growth arised from 1 050 to 1 150℃.For the high-Nb steels,the austenite grain size was smaller than 100μm when heating temperature was in the range from 1 150 to 1 250℃.
In order to investigate the effect of Nb content of high-Nb steels on the growth of austenite grain growth during heating process.Means of chemical dissolution,filtration and separation and inductively coupled plasma spectrum were taken to examine the content of dissolved Nb in two high-Nb-low-Ti microallying steels at different temperatures.And a comparative study of the austenite grain growth behavior was carried out.Results showed that the mass fraction of dissolved Nb in low-Nb steel was higher than that in the high-Nb steel at lower heating temperatures.With heating temperature increasing,the content of dissolved Nb in high-Nb steel quickly increased.However,even if heating temperature gets to 1 300℃,the Nb can not be completely dissolved.A small amount of Nb existed in(Ti,Nb)(N,C)precipitate.The temperature of the austenite grain quick growth was related to the temperature at which the content of dissolved Nb quickly increased.As the mass fraction of Nb in steels increased from0.082%to 0.120%,the critical temperature of the austenite grain quick growth arised from 1 050 to 1 150℃.For the high-Nb steels,the austenite grain size was smaller than 100μm when heating temperature was in the range from 1 150 to 1 250℃.
引文
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[2]Hulka K,Gray J M,Heisterkamp F.Metallurgical concept and full scale testing of a high toughness,H2S resistant0.03%C-0.10%Nb steel[R].Sao Paulo:CBMM,1990.
[3]LAN L Y,QIU C L,ZHAO D W,et al.Dynamic and static recrystallization behavior of low carbon high niobium microalloyed steel[J].Journal of Iron and Steel Research,International,2011,18(1):55.
[4]CAO Y B,XIAO F R,QIAO G Y,et al.Quantitative research on effects of Nb on hot deformation behaviors of high-Nb microalloyed steels[J].Materials Science and Engineering A,2011,530:277.
[5]QIAO G Y,CAO Y B,LIAO B,et al.Effect of dissolution and precipitation of Nb on phase transformation,microstructure,and microhardness of two high-Nb pipeline steels[J].Transactions of the Indian Institute of Metals,2018,71(3):627.
[6]王远琦,陈小伟,李志华,等.Nb-Ti微合金钢中的奥氏体晶粒长大行为研究[J].钢铁,2010,45(4):72.
[7]乔桂英,廖波,钟雅丽,等.一种测量钢中固溶铌和非固溶铌含量的方法:201010192938.X[P].2010-10-27.
[8]钢铁研究总院.钢与铁、镍合金的物理化学相分析[M].上海:上海科技出版社,1981.
[9]雍岐龙,马鸣图,吴宝榕.微合金钢——物理和力学冶金[M].北京:机械工业出版社,1989.
[10]YUAN S Q,LIANG G L.Dissolving behaviour of second phase particles in Nb-Ti microalloyed steel[J].Materials Letters,2009,63:2324.
[11]GU Y,TIAN P,WANG X,et al.Non-isothermal prior austenite grain growth of a high-Nb X100pipeline steel during a simulated welding heat cycle process[J].Materials and Design,2016,89:589.
[12]Zener C.Grains,phases,and interfaces:An interpretation of microstructure[J].Trans AIME,1948,175:47.
[13]Hutchinson C R,Zurob H S,Sinclair C W,et al.The comparative effectiveness of Nb solute and NbC precipitates at impeding grain-boundary motion in Nb steels[J].Scripta Materialia,2008,59:635.