低温轧制终冷温度对GCr15轴承钢组织性能的影响
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摘要
对GCr15钢在Gleeble-3500热模拟试验机上进行了双道次热压缩试验,模拟其低温轧制后不同终冷温度条件下相变过程,采用光学显微镜、扫描电镜(SEM)和拉伸试验机研究了其在不同终冷温度条件下网状碳化物、珠光体组织形貌及拉伸性能。结果表明:终冷温度为600℃至650℃时,GCr15钢可获得珠光体团直径较小、渗碳体片层较细、网状碳化物较少的组织;拉伸试验表明,在750℃至550℃范围内,随着终冷温度降低,抗拉强度逐渐增大。
The double pass thermal compression test of GCr15 steel was carried out on a Gleeble-3500 thermal simulation machine, and the phase transformation process of the steel was simulated under different final cooling temperatures after low temperature rolling. The morphology of network carbide, pearlite and tensile properties of the GCr15 steel at different final cooling temperatures were studied by means of optical microscope, scanning electron microscopy(SEM) and tensile testing machine. The results show that when the final cooling temperature is 600 ℃-650 ℃, the microstructure of the GCr15 steel with smaller pearlite diameter, finer cementite lamellae and less network carbides can be obtained. The tensile test shows that the tensile strength gradually increases with the decrease of final cooling temperature between 750 ℃ and 550 ℃.
The double pass thermal compression test of GCr15 steel was carried out on a Gleeble-3500 thermal simulation machine, and the phase transformation process of the steel was simulated under different final cooling temperatures after low temperature rolling. The morphology of network carbide, pearlite and tensile properties of the GCr15 steel at different final cooling temperatures were studied by means of optical microscope, scanning electron microscopy(SEM) and tensile testing machine. The results show that when the final cooling temperature is 600 ℃-650 ℃, the microstructure of the GCr15 steel with smaller pearlite diameter, finer cementite lamellae and less network carbides can be obtained. The tensile test shows that the tensile strength gradually increases with the decrease of final cooling temperature between 750 ℃ and 550 ℃.
引文
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[2] 李昭昆,雷建中,徐海峰,等.国内外轴承钢的现状与发展趋势[J].钢铁研究学报,2016,28(3):2-11.LI Zhao-kun,LEI Jian-zhong,XU Hai-feng,et al.Current status and development trend of bearing steel in China and abroad[J].Journal of Iron and Steel Research,2016,28(3):2-11.
[3] 钟顺思.轴承钢[M].北京:冶金工业出版社,2000.
[4] 池武.轴承钢棒线材控轧控冷工艺研究[D].上海:上海交通大学,2009.CHI Wu.Research on controlled rolling and cooling process of bar and wire rod of bearing steel[D].Shanghai:Shanghai Jiao Tong University,2009.
[5] 刘剑恒.轴承钢GCr15棒材产品低温精轧的研究[J].钢铁,2005,40(11):49-52.LIU Jian-heng.Research on low temperature finish rolling of GCr15 bearing steel bar[J].Iron and Steel,2005,40(11):49-52.
[6] 晁月林,邓素怀,王丽萍,等.低温轧制温度对 GCr15 轴承钢组织的影响[J].金属热处理,2014,39(4):68-71.CHAO Yue-lin,DENG Su-huai,WANG Li-ping,et al.Effect of temperature on microstructure of GCr15 bearing steel in low-temperature rolling[J].Heat Treatment of Metals,2014,39(4):68-71.
[7] 刘靖,韩静涛,赵杰,等.石钢GCr15轴承钢再结晶规律研究[J].轧钢,2007,24(6):28-30.LIU Jing,HAN Jing-tao,ZHAO Jie,et al.Study of recrystallization rules of GCr15 bearing steel[J].Steel Rolling,2007,24(6):28-30.
[8] 蒋波.盾构机轴承套圈用钢变形与热处理组织性能研究[D].北京:北京科技大学,2015.JIANG Bo.Investigation of microstructure and properties of bearing ring steel for shield tunneling during deformation and heat treatment process[D].Beijing:University of Science and Technology Beijing,2015.
[9] 刘江.轴承钢GCr15SiMn相变和组织的热模拟研究[D].镇江:江苏大学,2017.LIU Jiang.Thermal simulation on phase transformation and microstructure of GCr15SiMn bearing steel[D].Zhenjiang:Jiangsu University,2017.
[10] 赵宪明,孙艳坤,吴迪.GCr15轴承钢高温变形后控冷工艺的研究[J].材料科学与工艺,2010,18(2):217-220.ZHAO Xian-ming,SUN Yan-kun,WU Di.Controlled cooling of GCr15 bearing steel after high temperature deformation[J].Materials Science and Technology,2010,18(2):217-220.
[11] 霍向东,刘江,李烈军,等.终轧工艺及轧后冷速对GCr15SiMn钢相变组织的影响[J].材料热处理学报,2017,38(2):118-124.HUO Xiang-dong,LIU Jiang,LI Lie-jun,et al.Effect of finish rolling process and cooling rate after rolling on transformation microstructure of GCr15SiMn steel[J].Transactions of Materials and Heat Treatment,2017,38(2):118-124.
[12] 黄贞益,任洪敏,邵仁志,等.?45 mm 轴承钢预穿水冷却工艺研究[J].热加工工艺,2014,43(15):110-113.HUANG Zhen-yi,REN Hong-min,SHAO Ren-zhi,et al.Research on pre-water cooling process of ?45 mm bearing steel[J].Hot Working Technology,2014,43(15):110-113.
[13] Zhang J G,Sun D S,Shi S H.Microstructure and continuous cooling transformation thermo grams of spray formed GCr15 steel[J].Materials Science and Engineering,2002,326(1):20-25.
[14] 姜锡山.特殊钢金相图谱[M].北京:机械工业出版社,2003.
[15] 孙艳坤,吴迪.超快冷终冷温度对轴承钢棒材组织性能影响[J].东北大学学报(自然科学版),2008,29(11):1573-1575.SUN Yan-kun,WU Di.Influence of UFC final cooling temperature on structure and microhardness of bearing steel rod[J].Journal of Northeastern University(Natural Science),2008,29(11):1573-1575.
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