55MnCrNb钢的脱碳行为
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摘要
以含Nb高碳钢为研究对象,研究了钢的表面脱碳层深度及奥氏体晶粒大小随温度变化规律。结果表明:试验钢在800℃保温20 min,钢的表面有一层致密的氧化铁皮,脱碳现象不明显。温度从900℃升高到950℃,钢表面氧化铁皮开始开裂并与基体间形成缝隙,脱碳现象明显,在1180℃时总脱碳层深度为269μm。随温度从900℃升高到1180℃,奥氏体晶粒尺寸长大明显,900℃奥氏体晶粒平均尺寸16.8μm,当温度升高到1180℃时,奥氏体晶粒平均尺寸达到132μm。随温度升高,未固溶Nb C量降低及奥氏体晶粒长大,使C原子扩散阻力降低,脱碳层深度随温度升高而增大。
The depth of decarburized layer and the grain size of autenite for high carbon Nb bearing steel with the increasing of temperature were researched.The results show that there are compact iron scale and the decarburization phenomenon is not distinct on the surface of the steel.The decarburization behavior occur when the iron scale cracking with the temperature increased from 900 ℃ to 950 ℃.The total depth of decarburized layer is 269 μm at 1180 ℃.The grain size of autenite increases from 16.8 μm to 132 μm with the temperature increased from 900 ℃ to 1180 ℃.The insoluble Nb C content decrease and the austnite size increases which decreases the diffuse resistance of carbon and leads to the increase of the depth of decarburized layer with the temperature increasing.
The depth of decarburized layer and the grain size of autenite for high carbon Nb bearing steel with the increasing of temperature were researched.The results show that there are compact iron scale and the decarburization phenomenon is not distinct on the surface of the steel.The decarburization behavior occur when the iron scale cracking with the temperature increased from 900 ℃ to 950 ℃.The total depth of decarburized layer is 269 μm at 1180 ℃.The grain size of autenite increases from 16.8 μm to 132 μm with the temperature increased from 900 ℃ to 1180 ℃.The insoluble Nb C content decrease and the austnite size increases which decreases the diffuse resistance of carbon and leads to the increase of the depth of decarburized layer with the temperature increasing.
引文
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[17]张鹏程,武会宾,唐荻,等.低碳微合金钢中Nb、V、Ti碳氮化物的回溶研究[J].金属热处理,2007,32(6):41-44.Zhang Pengcheng,Wu Huibin,Tang Di,et al. Resolution of Nb,V and Ti carbonitride precipitates in low carbon microalloyed steels[J].Heat Treatment of Metals,2007,32(6):41-44.
[2]陈明,欧阳志,徐袁,等.常用弹簧扁钢脱碳倾向性试验研究[J].金属制品,2014,40(3):23-27.Chen Ming,Ouyang Zhi,Xu Yuan,et al. Experimental research on decarburization trend of typical spring flat steel[J]. Metal Products,2014,40(3):23-27.
[3]石楠楠,吴晓春,周青春.表面脱碳层对H13钢热疲劳性能的影响[J].上海金属,2011,33(1):26-29.Shi Nannan, Wu Xiaochun, Zhou Qingchun. Effect of surface decarburization layer on thermal fatigue behavior of steel H13[J].Shanghai Metals,2011,33(1):26-29.
[4]陈银莉,左茂方,罗兆良,等. 60Si2Mn弹簧钢表面脱碳理论及试验研究[J].材料热处理学报,2015,36(1):192-198.Chen Yinli, Zuo Maofang, Luo Zhaoliang, et al. Theoretical and experimental study on surface decarburization of 60Si2Mn spring steel[J].Transactions of Materials and Heat Treatment,2015,36(1):192-198.
[5]崔娟,刘雅政,黄学启.中碳弹簧钢加热过程脱碳特性的试验研究[J].热加工工艺,2007,36(20):20-23.Cui Juan,Liu Yazheng,Huang Xueqi. Investigation on decarburizing characteristic of medium carbon spring steel in heating process[J]. Hot Working Technology,2007,36(20):20-23.
[6]陈景浒,庄汉洲. CSP工艺对锯片钢SKS51脱碳层的影响[J].南方金属,2014(4):13-16.Chen Jinghu, Zhuang Hanzhou. Influence of CSP process on decarburization of steel SKS51 for saw blades[J]. Southern Metals,2014(4):13-16.
[7]张朝磊,赵帆,文新理,等.加热温度和Nb对弹簧钢60Si2Cr VAT完全脱碳层深度和形貌的影响[J].材料热处理学报,2015,36(9):167-172.Zhang Chaolei, Zhao Fan, Wen Xinli, et al. Effects on heating temperature and niobium microalloying on complete decarburized depth and microstructure of spring steel 60Si2CrVAT[J]. Transactions of Materials and Heat Treatment,2015,36(9):167-172.
[8]鲁修宇,吴超,罗德信,等. 55SiCr弹簧钢脱碳与氧化行为研究[J].热处理技术与装备,2016,37(2):63-66.Lu Xiu Yu, Wu Chao, Luo Dexin, et al. Behavioral research on decarburization and oxidation of the 55SiCr spring steel[J]. Heat Treatment Technology and Equipment,2016,37(2):63-66.
[9]王猛,陈伟庆,郝占全,等.加热期间弹簧钢55SiCr表面脱碳的影响因素研究[J].河南冶金,2010,18(2):12-14.Wang Meng,Chen Weiqing,Hao Zhanquan,et al. Study on surface decarburization of 55SiCr spring steel during heating[J]. Henan Metallurgy,2010,18(2):12-14.
[10]廖舒纶,沈奎,于学森,等. Nb含量对高碳钢相转变的影响[J].金属热处理,2015,40(4):45-49.Liao Shulun,Shen Kui,Yu Xuesen,et al. Effect of Nb content on phase transformation of high carbon steel[J]. Heat Treatment of Metals,2015,40(4):45-49.
[11]王猛,王晓晨,程四华,等.含Nb高碳钢的奥氏体晶粒长大模型[J].材料热处理学报,2016,37(4):243-248.Wang Meng,Wang Xiaochen,Cheng Sihua,et al. Grain growth model of austenite in a Nb-microalloyed high carbon steel[J]. Transactions of Materials and Heat Treatment,2016,37(4):243-248.
[12]夏彪.用金相法测量GCr15脱碳层[J].物理测试,2013,31(6):21-22.Xia Biao. Measurement of decarburization layer of GCr15 by metallographic method[J]. Physics Examination and Testing,2013,31(6):21-22.
[13]张博,王福明,吴华林,等. Nb对60Si2CrVAT弹簧钢力学性能的影响[J].金属热处理,2011,36(5):29-33.Zhang Bo, Wang Fuming, Wu HuaLin, et al. Effect of Nb on mechanical properties of 60Si2CrVAT spring steel[J]. Heat Treatment of Metals,2011,36(5):29-33.
[14]吴光亮,孟征兵,李一为,等.薄板坯连铸连轧过程中氧化铁皮变化规律[J].钢铁,2011,46(6):79-85.Wu Guangliang, Meng Zhengbing, Li Yiwei, et al. Variation characteristics of scale during thin slab continuous casting and rolling[J]. Iron and Steel,2011,46(6):79-85.
[15]米永峰,曹建春,张正延,等.碳含量对钢中碳化铌在奥氏体中固溶度积的影响[J].钢铁,2012,47(3):84-88.Mi Yongfeng,Cao Jianchun,Zhang Zhengyan,et al. Effect of carbon content on the solubility of niobium carbide in austenite[J]. Iron and Steel,2012,47(3):84-88.
[16]Yang S W,Wang X M,Shang C J,et al. Relaxation of deformed austenite and refinement of bainite in a Nb-containing microalloyed steel[J]. Journal of University of Science and Technology Beijing,2001,8(3):214-217.
[17]张鹏程,武会宾,唐荻,等.低碳微合金钢中Nb、V、Ti碳氮化物的回溶研究[J].金属热处理,2007,32(6):41-44.Zhang Pengcheng,Wu Huibin,Tang Di,et al. Resolution of Nb,V and Ti carbonitride precipitates in low carbon microalloyed steels[J].Heat Treatment of Metals,2007,32(6):41-44.