淬火温度对NM550钢组织和性能的影响
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摘要
通过光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和力学性能、耐磨性能检测等方法研究了淬火温度对NM550组织和性能的影响规律。结果表明,在800～1000℃范围内随淬火温度的升高,试验钢的显微组织由铁素体和马氏体的复相组织转变为全马氏体组织。随淬火温度的增加,试验钢的原始奥氏体晶粒尺寸不断增大,导致马氏体板条块(Block)尺寸不断增大,大角度晶界的数量逐渐减少。在830～900℃之间淬火时,试验钢的强度、硬度和低温冲击性能良好;当淬火温度高于920℃时,强度略有下降,而硬度和韧性的下降幅度较大,尤其是试验钢的硬度降低到530 HBW以下。淬火温度在860～900℃时,试验钢具有最佳的耐磨性能。
The effect of quenching temperature on microstructure and mechanical properties of NM550 was investigated by means of optical microscopy(OM),scanning electron microscopy(SEM),electron backscattered diffraction(EBSD) and mechanical testing.The results show that with the increasing quenching temperature in the range of 800-1000 ℃,the microstructure of tested steel is changed from the mixed structure of ferrite and martensite to the complete martensite structure.With the increase in the quenching temperature,the prior austenite grain size continuously increases,resulting in the increase in the size of martensite block and the number of high-angle grain boundaries gradually decreases.The strength,hardness and low temperature impact toughness of tested steel are good when quenched between 830-900 ℃.Howerver,when the quenching temperature is higher than 920 ℃,the strength slightly decreases,the hardness and toughness obviously decrease,especially the hardness of tested steel is reduced to 530 HBW or lower.When the quenching temperature is between 860-900 ℃,the tested steel has the best wear resistance.
The effect of quenching temperature on microstructure and mechanical properties of NM550 was investigated by means of optical microscopy(OM),scanning electron microscopy(SEM),electron backscattered diffraction(EBSD) and mechanical testing.The results show that with the increasing quenching temperature in the range of 800-1000 ℃,the microstructure of tested steel is changed from the mixed structure of ferrite and martensite to the complete martensite structure.With the increase in the quenching temperature,the prior austenite grain size continuously increases,resulting in the increase in the size of martensite block and the number of high-angle grain boundaries gradually decreases.The strength,hardness and low temperature impact toughness of tested steel are good when quenched between 830-900 ℃.Howerver,when the quenching temperature is higher than 920 ℃,the strength slightly decreases,the hardness and toughness obviously decrease,especially the hardness of tested steel is reduced to 530 HBW or lower.When the quenching temperature is between 860-900 ℃,the tested steel has the best wear resistance.
引文
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[3]邓想涛,王昭东,王国栋.工艺参数对NM500耐磨钢力学性能和三体冲击磨损性能的影响[J].材料热处理学报,2012,33(9):65-69.Deng Xiangtao,Wang Zhaodong,Wang Guodong.Effects of process parameters on mechanical property and three-body impact abrasive wear of abrasion resistant steel NM500[J].Transactions of Materials and Heat Treatment,2012,33(9):65-69.
[4]李文斌,费静,曹忠孝,等.我国低合金高强度耐磨钢的生产现状及发展方向[J].机械工程材料,2012,36(2):6-10.Li Wenbin,Fei Jing,Cao Zhongxiao,et al.Production status and development direction of wear resistant steel with low alloy and high strength in China[J].Materials for Mechanical Engineering,2012,36(2):6-10.
[5]邓锋,胡锋,吴开明.低合金高强度耐磨钢的发展及应用[J].金属材料与冶金工程,2016,44(2):29-35.Deng Feng,Hu Feng,Wu Kaiming.Development and application of low-alloy high-strength wear-resistant steel[J].Metal Materials and Metallurgy Engineering,2016,44(2):29-35.
[6]麻衡,周平,杜军.热处理工艺对NM500耐磨钢组织性能的影响[J].金属热处理,2015,40(8):159-163.Ma Heng,Zhou Ping,Du Jun.Effect of heat treatment on mechanical properties of NM500 steel[J].Heat Treatment of Metals,2015,40(8):159-163.
[7]邓想涛,王昭东,王国栋,等.HB450低合金超高强度耐磨钢回火过程中的组织性能演变[J].钢铁,2011,46(5):60-63.Deng Xiangtao,Wang Zhaodong,Wang Guodong,et al.Microstructure and properties evolution of HB450 ultra-high strength low-alloy abrasion resistant steel during tempering[J].Iron and Steel,2011,46(5):60-63.
[8]彭军,牛亮,郭永,等.V、Ti对NM400钢耐磨性能的影响[J].金属热处理,2016,41(2):19-22.Peng Jun,Niu Liang,Guo Yong,et al.Effect of V and Ti on wear resistance of NM400 steel[J].Heat Treatment of Metals,2016,41(2):19-22.
[9]杨瑞林,李力军,李玉成.新型低合金高强韧性耐磨钢的研究[J].钢铁,1999,34(7):41-45.Yang Ruilin,Li Lijun,Li Yucheng.Study on a new alloy high strength and high toughness and wear resistant steel[J].Iron and Steel,1999,34(7):41-45.
[10]惠卫军,董瀚,翁宇庆,等.淬火温度对Cr-Mo-V系低合金高强度钢力学性能的影响[J].金属热处理,2002,27(3):14-17.Hui Weijun,Dong Han,Weng Yuqing,et al.Influence of quenching temperature on mechanical properties of low alloy high strength Cr-MoV steel[J].Heat Treatment of Metals,2002,27(3):14-17.
[11]Jose Rendon,Mikael Olsson.Abrasive wear resistance of some commercial abrasion resistant steels evaluated laboratory test methods[J].Wear,2009,267(11):2055-2061.