加热条件与混合气氛对50CrV4钢表面脱碳的影响
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摘要
试验过程模拟武钢CSP均热炉的加热条件,分别研究加热温度、保温时间、炉内气氛对弹簧钢50CrV4表面脱碳的影响规律。结果表明,50CrV4钢脱碳厚度随保温时间的延长而增加;保温时间为30和60min,加热温度低于1050℃时,脱碳层厚度随温度升高而增加,高于1050℃时,脱碳层由于氧化加剧而减少,1050℃为脱碳敏感温度;O_2+CO_2+H_2O+N_2混合气氛比O_2+CO_2+N_2和H_2O+N_2降低脱碳层厚度更加明显。结合氧化模型和菲克第二定律,建立并修正了脱碳计算模型,利用试验数据验证其可靠性。
An experiment simulating the heating environment of CSP furnace was performed to study the effects of heating temperature,holding time and heating atmosphere on the decarburization of 50 CrV4 spring steel.The results show that the decarburization layer depth of 50 CrV4 steel increases with increasing the holding time.With holding time of 30 and 60 min,the decarburization layer depth increases with increasing the heating temperature below 1 050℃ and decreases when the temperature is over 1 050℃.The decarburization layer depth reaches the peak at 1 050℃.The mixed atmosphere of O_2+CO_2+H_2O+N_2 can effectively reduce the decarburization layer depth more than that of O_2+CO_2+N_2 and H_2O+N_2.Combined with the oxidation model and Fick's Second Law,the decarburization calculation model is established and corrected with experimental data.
An experiment simulating the heating environment of CSP furnace was performed to study the effects of heating temperature,holding time and heating atmosphere on the decarburization of 50 CrV4 spring steel.The results show that the decarburization layer depth of 50 CrV4 steel increases with increasing the holding time.With holding time of 30 and 60 min,the decarburization layer depth increases with increasing the heating temperature below 1 050℃ and decreases when the temperature is over 1 050℃.The decarburization layer depth reaches the peak at 1 050℃.The mixed atmosphere of O_2+CO_2+H_2O+N_2 can effectively reduce the decarburization layer depth more than that of O_2+CO_2+N_2 and H_2O+N_2.Combined with the oxidation model and Fick's Second Law,the decarburization calculation model is established and corrected with experimental data.
引文
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[16]高建文,赵刚,徐耀文,等.75Cr1钢加热炉内表面脱碳分析[J].钢铁研究学报,2017,29(2):150.(Gao J W,Zhao G,Xu Y W,et al.Analysis of surface decarburization of 75Cr1steel heating in furnace[J].Journal of Iron and Steel Research,2017,29(2):150.)
[2]Nakano T,Sakakibara T,Wakita M,et al.Effect of alloying elements and surface treatment on corrosion fatigue strength of high-strength suspension coil springs[J].JSAE Review,2001,22(3):337.
[3]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.(Chen Y L,Zuo M F,Luo G L,et al.Theoretical and experimental study on surface decarburization of 60Si2Mn spring steel[J].Transactions of Materials and Heat Treatment,2015,36(1):192.)
[4]胡磊,王雷,麻晗.高碳钢盘条的表面氧化与脱碳行为[J].钢铁研究学报,2016,28(3):67.(Hu L,Wang L,Ma H.Behaviors of oxidation and decarburization on surfaces of high carbon steel wire rods[J].Journal of Iron and Steel Research,2016,28(3):67.)
[5]薛顺,田俊,成国光,等.新型高铁弹条用弹簧钢的表面脱碳及氧化性能[J].钢铁研究学报,2013,25(10):47.(Xue S,Tian J,Cheng G G,et al.Research on surface decarburization and oxidation of a new type of spring steel for elastic bar of high speed railway[J].Journal of Iron and Steel Research,2013,25(10):47.)
[6]聂义宏,付书红,惠卫军,等.硼对高强度弹簧钢脱碳敏感性的影响[J].钢铁研究学报,2005,17(4):45.(Nie Y H,Fu S H,Hui W J,et al.Effect of boron on decarburization sensitivity of high strength spring steel[J].Journal of Iron and Steel Research,2005,17(4):45.)
[7]Liu Y,Zhang W,Tong Q,et al.Effects of temperature and oxygen concentration on the characteristics of decarburization of 55SiCr spring steel[J].ISIJ International,2014,54(8):1920.
[8]Sinha A K.Physical Metallurgy Handbook[M].[S.l.]:McGraw-Hill Professional Publishing,2003.
[9]姜超,刘雅政,张朝磊,等.Nb-V微合金化对弹簧钢60Si2MnA表面脱碳的影响[J].热加工工艺,2011,40(4):180.(Jiang C,Liu Y Z,Zhang C L,et al.Effects of Nb-V microalloying on surface decarburization of spring steel 60Si2MnA[J].Hot Working Technology,2011,40(4):180.)
[10]史显波,赵连玉,王威,等.几种高速列车用弹簧钢的脱碳敏感性[J].材料热处理学报,2013,34(7):47.(Shi X B,Zhao L Y,Wang W,et al.Decarburization sensitivities of several spring steels used for high-speed trains[J].Transactions of Materials and Heat Treatment,2013,34(7):47.)
[11]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.(Cui J,Liu Y Z,Huang X Q.Investigation on decarburizing characteristic of medium carbon spring steel in heating process[J].Hot Working Technology,2007,36(20):20.)
[12]戴成珂,赵刚,徐耀文,等.30CrMo钢表面脱碳试验[J].钢铁,2016,51(7):60.(Dai C K,Zhao G,Xu Y W,et al.Experiment on surface decarburization of 30CrMo steel[J].Iron and Steel,2016,51(7):60.)
[13]Donahue S J,Renowden M.Automated atmosphere control system advances heat treating cycles[J].Wire Journal International,1997,30(4):82.
[14]洪陆阔,艾立群,程荣,等.铁碳合金薄带气固反应脱碳工艺[J].钢铁研究学报,2016,28(5):36.(Hong L K,Ai L Q,Cheng R,et al.Fe-C alloy ribbons gas-solid decarburization process[J].Journal of Iron and Steel Research,2016,28(5):36.)
[15]张鹏,冯光纯.变形条件对硅锰弹簧钢脱碳的影响[J].钢铁研究,1997(3):21.(Zhang P,Feng G C.Effects of deforming conditions on decarburization of Si-Mn-bearing spring steel[J].Research on Iron and Steel,1997(3):21.)
[16]高建文,赵刚,徐耀文,等.75Cr1钢加热炉内表面脱碳分析[J].钢铁研究学报,2017,29(2):150.(Gao J W,Zhao G,Xu Y W,et al.Analysis of surface decarburization of 75Cr1steel heating in furnace[J].Journal of Iron and Steel Research,2017,29(2):150.)