时效处理对AM355不锈钢组织与性能的影响
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摘要
采用扫描电镜(SEM)、室温拉伸、电化学法和FeCl-_3浸泡法等手段,研究了时效温度对AM355不锈钢显微组织、力学性能和耐蚀性能的影响。结果表明:350～625℃时效处理后,AM355不锈钢的基体组织都为马氏体+奥氏体,且奥氏体含量随着时效温度的升高而呈现逐渐增加的趋势。电化学性能和Fe Cl3溶液浸泡腐蚀结果表明,随着时效温度的升高,AM355不锈钢的耐蚀性能呈现先减小而后升高的特征;时效温度为350℃时,AM355不锈钢具有最佳的强塑性结合以及最佳的耐点蚀性能。
Effect of aging temperature on microstructure,mechanical properties and corrosion resistance of AM355 stainless steel were studied by means of scanning electron microscopy (SEM),room temperature tensile test,electrochemical method and FeCl_3 immersion method. The results show that,after aging treatment at 350-625 ℃,the matrix microstructure of AM355 stainless steel is composed of martensite and austenite,and with the increase of aging temperature,the content of austenite increases gradually. The electrochemical performance and FeCl_3 solution immersion corrosion results show that the corrosion resistance of AM355 stainless steel first decreases and then increases with the increase of aging temperature; when the aging temperature is at 350 ℃,the AM355 stainless steel has the best combination of strength and plasticity,together with the best pitting resistance.
Effect of aging temperature on microstructure,mechanical properties and corrosion resistance of AM355 stainless steel were studied by means of scanning electron microscopy (SEM),room temperature tensile test,electrochemical method and FeCl_3 immersion method. The results show that,after aging treatment at 350-625 ℃,the matrix microstructure of AM355 stainless steel is composed of martensite and austenite,and with the increase of aging temperature,the content of austenite increases gradually. The electrochemical performance and FeCl_3 solution immersion corrosion results show that the corrosion resistance of AM355 stainless steel first decreases and then increases with the increase of aging temperature; when the aging temperature is at 350 ℃,the AM355 stainless steel has the best combination of strength and plasticity,together with the best pitting resistance.
引文
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[3]范春华,李国祥,李雪莹,等.AM355不锈钢在酸性溶液中的腐蚀电化学行为[J].材料科学与工程学报,2018,36(1):121-124.Fan Chunhua,Li Guoxiang,Li Xueying,et al.Corrosion electrochemical behavior of AM355 stainless steel in acid solution[J].Journal of Material Science and Engineering,2018,36(1):121-124.
[4]Bao C G,Xing J D,Gao Y M,et al.Study on electrochemical corrosion properties of stainless steel material used as hydraulic turbine parts[J].Foundry,2002,51(7):425-427.
[5]胡家齐,刘荣佩,梁剑雄,等.调整处理对AM355不锈钢微观组织与力学性能的影响[J].金属热处理,2015,40(6):91-96.Hu Jiaqi,Liu Rongpei,Liang Jianxiong,et al.Effect of adjustment treatment on microstructure and mechanical properties of AM355stainless steel[J].Heat Treatment of Metals,2015,40(6):91-96.
[6]唐娴,张雷,王竹,等.SO2-4对含Cl-溶液中316L奥氏体不锈钢钝化行为及点蚀行为的影响[J].工程科学学报,2018,36(1):1-10.Tang Xian,Zhang Lei,Wang Zhu,et al.The effect of SO2-4on the passivation behavior and pitting behavior of 316L austenitic stainless steel in Cl-solution[J].Journal of Engineering Science,2018,36(1):1-10.
[7]谢建平,张强,王书强,等.热处理工艺对022Cr17Ni12Mo2不锈钢组织和腐蚀性能的影响[J].热加工工艺,2017,46(24):248-251.Xie Jianping,Zhang Qiang,Wang Shuqiang,et al.Effect of heat treatment process on microstructure and corrosion resistance of022Cr17Ni12Mo2 stainless steel[J].Hot Working Technology,2017,46(24):248-251.
[9]Ferreira M G S,Hakiki N E,Goodlet G,et al.Influence of the temperature of film formation on the electronic structure of oxide films formed on 304 stainless steel[J].Electrochim Acta,2001,46:3767-3769.
[10]Cheng X Q,Li C T,Dong C F,et al.Constituent phases of the passive film formed on 2205 stainless steel by dynamic electrochemical impedance spectroscopy[J].International Journal of Minerals Metallurgy and Materials,2011,18(1):42-47.
[11]Ahmad S,Mehta M L,Saraf S K,et al.Electrochemical Studies of Stress Corrosion Cracking of Sensitized AISI 304 Stainless Steel in Polythionic Acids[J].Corrosion-Houston TX,2012,41(6):363-367.
[12]Gomez-Duran M,Macdonald D D.Stress corrosion cracking of sensitized Type 304 stainless steel in thiosulphate solution.II.Dynamics of fracture[J].Corrosion Science,2006,48(7):1608-1622.