高温渗碳齿轮钢的晶粒粗化行为
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摘要
为了开发适合980℃高温渗碳的齿轮钢,利用伪渗碳方法,研究了铌质量分数为0、0.036%、0.060%和0.100%的18Cr2Ni2Mo渗碳齿轮钢在930和980℃的晶粒粗化行为。结果表明,由于析出NbC钉扎晶界,铌微合金化可以显著细化试验钢在930和980℃奥氏体化后的晶粒尺寸,且随着铌质量分数增加,铌微合金化明显抑制试验钢在980℃长时间奥氏体化晶粒粗化倾向。添加0.100%Nb的18Cr2Ni2Mo齿轮钢在980℃奥氏体化20 h后,平均晶粒尺寸仍然在26μm左右,适合于980℃高温长时间渗碳。
In order to develop gear steel for carburizing at high temperature of 980 ℃,austenite grain coarsening of case hardening steel 18 Cr2 Ni2 Mo with the addition of niobium in contents of 0,0.036%,0.060% and 0.100% was investigated by means of pseudo-carburizing at 930 and 980 ℃. Results show that the grain size of tested steel austenitizing at 930 and 980 ℃ can be significantly refined by niobium addition due to the pinning effect of NbC precipitates,and with the increase of niobium mass percent in steel,grain coarsening at high temperature of 980 ℃ can be evidently hindered. After austenitizing at 980 ℃ for 20 h,the average grain size of the 18 Cr2 Ni2 Mo gear steel with 0.100% Nb addition is still about 26 μm,so the steel can be used for carburizing at high temperature of 980 ℃.
In order to develop gear steel for carburizing at high temperature of 980 ℃,austenite grain coarsening of case hardening steel 18 Cr2 Ni2 Mo with the addition of niobium in contents of 0,0.036%,0.060% and 0.100% was investigated by means of pseudo-carburizing at 930 and 980 ℃. Results show that the grain size of tested steel austenitizing at 930 and 980 ℃ can be significantly refined by niobium addition due to the pinning effect of NbC precipitates,and with the increase of niobium mass percent in steel,grain coarsening at high temperature of 980 ℃ can be evidently hindered. After austenitizing at 980 ℃ for 20 h,the average grain size of the 18 Cr2 Ni2 Mo gear steel with 0.100% Nb addition is still about 26 μm,so the steel can be used for carburizing at high temperature of 980 ℃.
引文
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[3]Sumida M,Nomura I.Trend and challenge in carburized forged parts of dirvetrain[J].Heat Treatment,2005,45(2):76.
[4]Goldstein J I,Moren A E.Diffusion modeling of the carburization process[J].Metallurgical and Materials Transactions A,1978,9(11):1515.
[5]刘燕,王毛球,时捷,等.含铌齿轮钢的晶粒长大动力学[J].钢铁研究学报,2008,20(11):37.(LIU Yan,WANG Mao-qiu,SHI Jie,et al.Kinetics of austenite grain coarsening in Nb-bearing gear steels[J].Journal of Iron and Steel Research,2008,20(11):37.)
[6]Morais R F D,Reguly A,Almeida L H D.Transmission electron microscopy characterization of a Nb microalloyed steel for carburizing at high temperatures[J].Journal of Materials Engineering and Performance,2006,15(4):494.
[7]Alogab K A,Matlock D K,Speer J G,et al.The effects of heating rate on austenite grain growth in a Ti-modified SAE 8620steel with controlled niobium additions[J].ISIJ International,2007,47(7):1034.
[8]Alogab K A,Matlock D K,Speer J G,et al.The influence of niobium microalloying on austenite grain coarsening behavior of Timodified SAE 8620 steel[J].ISIJ International,2007,47(2):307.
[9]YANG Y H,WANG M Q,CHEN J C,et al.Microstructure and mechanical properties of gear steels after high temperature carburization[J].Journal of Iron and Steel Research,International,2013,20(12):140.
[10]杨延辉,王毛球,王春芳,等.钛铌微合金化齿轮钢的奥氏体晶粒长大研究[J].钢铁研究学报,2012,24(12):32.(YANGYan-hui,WANG Mao-qiu,WANG Chun-fang,et al.Austenite grain growth in Ti-Nb microalloyed gear gteels[J].Journal of Iron and Steel Research,2012,24(12):32.)
[11]汪杨鑫,赵秀明,毛向阳,等.SCr420H钢奥氏体晶粒长大动力学[J].钢铁,2018,53(7):80.(WANG Yang-xin,ZHAO Xiuming,MAO Xiang-yang,et al.Kinetics of austenite grain growth in SCr420H steel[J].Iron and Steel,2018,53(7):80.)
[12]张玉成,孟振生,孟杨,等.S460ML钢中铌和钛的应变诱导析出行为[J].钢铁,2018,53(8):90.(ZHANG Yu-cheng,MENGZhen-sheng,MENG Yang,et al.Strain induced precipitation behavior of Nb and Ti in S460ML steel[J].Iron and Steel,2018,53(8):90.)
[13]李新宇,杨卯生,周晓龙,等.15Cr14Co12Mo5Ni2齿轮钢的扭转疲劳特性及裂纹扩展行为[J].钢铁,2017,52(9):84.(LI Xin-yu,YANG Mao-sheng,ZHOU Xiao-long,et al.Torsion fatigue characteristics and crackpropagation behavior of 15Cr14Co12Mo5Ni2gear steel[J].Iron and Steel,2017,52(9):84.)