高氮不锈钢的奥氏体晶粒长大规律（英文）
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摘要
通过实验数据拟合计算和经验公式预测相结合的方法对高氮不锈钢的原始奥氏体晶粒长大规律进行研究,主要研究了奥氏体化温度和保温时间对实验钢原始奥氏体晶粒尺寸的影响规律。结果表明:经验公式适用于预测实验钢的原始奥氏体晶粒尺寸(AGS)。虽然高氮不锈钢的奥氏体晶粒尺寸会随着奥氏体化温度的升高和保温时间的延长而逐渐增大,但是由于实验钢中析出细小氮化物的钉扎作用,会对奥氏体晶粒粗化有一定的抑制作用。并基于高氮不锈钢的AGS实测数据推导出了Arrhenius型方程,结果显示计算结果显示与测量数据具有良好的一致性。
The effect of austenitizing temperature and holding time on original austenite grain size in high nitrogen stainless steel was studied. The austenitic grain growth rule of the experimental steel was investigated through experimental verification and empirical equation prediction. The results show that the empirical equations are reasonable for predicting the austenite grain size( AGS). Both a higher austenitizing temperature and a longer holding time can accelerate the growth of austenitic grain. However,the pinning of fine nitride precipitates during the phase transformation endows the high nitrogen stainless steel with some abilities to resist grain coarsening. The Arrhenius-type equation is proposed based on the measured AGSs of the high nitrogen stainless steel. The predicted results show a good agreement with the measured data.
The effect of austenitizing temperature and holding time on original austenite grain size in high nitrogen stainless steel was studied. The austenitic grain growth rule of the experimental steel was investigated through experimental verification and empirical equation prediction. The results show that the empirical equations are reasonable for predicting the austenite grain size( AGS). Both a higher austenitizing temperature and a longer holding time can accelerate the growth of austenitic grain. However,the pinning of fine nitride precipitates during the phase transformation endows the high nitrogen stainless steel with some abilities to resist grain coarsening. The Arrhenius-type equation is proposed based on the measured AGSs of the high nitrogen stainless steel. The predicted results show a good agreement with the measured data.
引文
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[2]Saito Y,Shiga C.Computer simulation of microstructural evolution in thermo-mechanical processing of steel plates[J].ISIJ Int,1992,32(3):414-418.
[3]Giumelli A K,Militzer M,Hawbolt E B.Analysis of the austenite grain size distribution in plain carbon steels[J].ISIJ Int,1999,39(3):271-280.
[4]Reti T,Fried Z,Felde I.Computer simulation of steel quenching process using a multi-phase transformation model[J].Computational Materials Science,2001,22(3/4):261-278.
[5]Jiao S,Penning J,Leysen F,et al.The modeling of the grain growth in a continuous reheating process of a low carbon Si-Mn bearing TRIP steel[J].ISIJ Int,2000,40(10):1035-1040.
[6]Shin D H,Park K T.Ultrafine grained steels processed by equal channel angular pressing[J].Materials Science and Engineering A,2005,410(12):299-302.
[7]Miura H,Hamaji H,Sakai T,et al.Effect of the second phase particles on ultra fine grain evolution during multidirectional forging of austenitic stainless steel[J].Materials Science Forum,2006,503-504:293-298.
[8]Zheng S J,Yang M S,Lei T.Influence of deformation and quenching temperature on structures and properties of high nitrogen stainless bearing steel[J].Materials Science Forum,2013,749:484-490.
[9]Kavishe F P L,Baker T J.Effect of prior austenite grain size and pearlite interlamellar spacing on strength and fracture toughness of a eutectoid rail steel[J].Materials Science and Technology,1986,2(8):816-822.
[10]Yue C X,Zhang L W,Liao S L,et al.Mathematical models for predicting the austenite grain size in hot working of GCr15 steel[J].Computational Materials Science,2009,45(2):462-466.
[11]Schino A D,Salvatori I,Kenny J M.Effects of martensite formation and austenite reversion on grain refining of AISI 304 stainless steel[J].Journal of Materials Science,2002,37(21):4561-4565.
[12]Varma S K,Kalyanam J,Murk L E,et al.Effect of grain size on deformation-induced martensite formation in 304 and 316 stainless steels during room temperature tensile testing[J].Journal of Materials Science Letters,1994,13(2):107-111.
[13]Jorge Otubo,Fabiana C Nascimento,Paulo R Mei,et al.Influence of austenite grain size on mechanical properties of stainless SMA[J].Materials Transactions,2002,43(5):916-919.
[14]Wang C F,Wang M Q,Shi J,et al.Eect of microstructure renement on the strength and toughness of low alloy martensitic steel[J].J Mater Sci Technol,2007,23(5):659-664.
[15]Zhang M,Yang M S,Li S S,et al.Effect of the carbon nitrogen compounds on the mechanical properties of high nitrogen stainless bearing steel[J].Journal of Iron and Steel Research,2012,24(5):18-23.
[16]Matsuo S,Ando T,Grant N J.Grain refinement and stabilization in spray formed AISI 1020 steel[J].Materials Science and Engineering A,2000,288(1):34-41.
[17]Suryanarayana C.Structure and properties of nanocrystalline materials[J].Bulletin of Materials Science,1994,17(4):307-346.
[18]Park K T,Kwon H J,Kim W J,et al.Microstructural characteristics and thermal stability of ultrafine grained 6061 Al alloy fabricated by accumulative roll bonding process[J].Materials Science and Engineering A,2001,316(1/2):145-152.
[19]Park K T,Kim Y S,Lee J G,et al.Thermal stability and mechanical properties of ultrafine grained low carbon steel[J].Materials Science and Engineering A,2000,293(1/2):165-172.