Cu合金化对Cr9Mo1钢耐腐蚀及力学性能的影响
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摘要
为了研究Cu元素对含Mo高Cr钢耐腐蚀性及力学性能的影响,本文通过添加Cu元素和热轧工艺,制备了含有0.2%(质量分数)Cu元素的两组不同含C量的Cr9Mo1钢.利用拉伸试验机、光学显微镜(OM)及盐雾试验箱等,对比研究了添加Cu元素前后,Cr9Mo1钢力学性能、组织形貌及耐盐雾腐蚀性能的变化.结果表明,添加Cu元素均可显著提高Cr9Mo1钢的耐腐蚀性,但对力学性能及组织形貌无显著影响.低C钢组添加Cu元素后耐腐蚀性显著提高,强度和延伸率仅略有提高;高C钢组添加Cu元素后耐腐蚀性显著提高,强度略有提高,延伸率有所降低.热轧后的低C钢组的基体组织为混晶铁素体,高C钢组的基体为马氏体组织和少量δ铁素体.C含量的多少主要影响钢的力学性能,对耐腐蚀性的影响无显著差异.相较于含C量低的Cr9Mo1钢,含C量高的Cr9Mo1钢强度较高、塑性较差,但耐腐蚀性基本相同.
In order to study the influence of Cu elements on the corrosion resistance and mechanical properties of high Cr steel containing Mo,two kinds of Cr9Mo1 steel with 0. 2%(massfraction) Cu but different contents of C were prepared by adding Cu and hot rolling technology. Mechanical properties,microstructure and corrosion resistance of the Cr9Mo1 steels were compared and studied before and after the addition of Cu by tensile test machine,optical microscope(OM) and salt fog test box. The results show that the corrosion resistance of the Cr9Mo1 steels could be improved remarkably by adding Cu,but their mechanical properties and microstructures were not significantly affected. In the low-carbon steel group,after the addition of Cu,the corrosion resistance was significantly improved,but the tensile strength and elongation were only slightly increased. In the highcarbon steel group,after the addition of Cu,the corrosion resistance was also markedly improved,and the increase of the tensile strength and decrease of the elongation were both small. After hot rolling,the matrix microstructure of the low-carbon steel group was ferrite while that of the high-carbon steel group was martensite and a small amount of δ-ferrite. The content of C mainly affected the mechanical properties of steel,and there was no significant influence on the corrosion resistance. Compared with the low-carbon Cr9Mo1 steel,the high-carbon Cr9Mo1 steel has higher strength but poorer plasticity,but their corrosion resistance is almost the same.
In order to study the influence of Cu elements on the corrosion resistance and mechanical properties of high Cr steel containing Mo,two kinds of Cr9Mo1 steel with 0. 2%(massfraction) Cu but different contents of C were prepared by adding Cu and hot rolling technology. Mechanical properties,microstructure and corrosion resistance of the Cr9Mo1 steels were compared and studied before and after the addition of Cu by tensile test machine,optical microscope(OM) and salt fog test box. The results show that the corrosion resistance of the Cr9Mo1 steels could be improved remarkably by adding Cu,but their mechanical properties and microstructures were not significantly affected. In the low-carbon steel group,after the addition of Cu,the corrosion resistance was significantly improved,but the tensile strength and elongation were only slightly increased. In the highcarbon steel group,after the addition of Cu,the corrosion resistance was also markedly improved,and the increase of the tensile strength and decrease of the elongation were both small. After hot rolling,the matrix microstructure of the low-carbon steel group was ferrite while that of the high-carbon steel group was martensite and a small amount of δ-ferrite. The content of C mainly affected the mechanical properties of steel,and there was no significant influence on the corrosion resistance. Compared with the low-carbon Cr9Mo1 steel,the high-carbon Cr9Mo1 steel has higher strength but poorer plasticity,but their corrosion resistance is almost the same.
引文
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[2]郝雪卉,董俊华,魏洁,等.AH32耐蚀钢显微组织对其腐蚀行为的影响[J].金属学报,2012,48(5):534-540.HAO Xuehui,DONG Junhua,WEI Jie,et al.Influence of microstructure of AH32 corrosion resistant steel on corrosion behavior[J].Acta Metallurgica Sinica,2012,48(5):534-540.
[3]张建春,麻晗,左龙飞,等.耐蚀钢筋20Mn Si Cr V在氯盐环境下的腐蚀行为[J].中国腐蚀与防护学报,2015,35(5):461-466.ZHANG Jianchun,MA Han,ZUO Longfei,et al.Corrosion behavior of 20Mn Si Cr V corrosion resistant rebar in chloride containing environment[J].Journal of Chinese Society for Corrosion and Protection,2015,35(5):461-466.
[4]TOWNSEND H E.Extending the limits of growth through development of corrosion resistant steel product[J].Corrosion,1999,55(6):547-553.
[5]TOWNSEND H E.Effects of alloying elements on the corrosion of steel in industrial atmospheres[J].Corrosion,2001,57(6):497-501.
[6]YAMASHITA M,MIYUKI H,NAGANO H.Corrosion resistance of weathering steel and its application[J].Sumitomo Search,1995,50(57):12-17.
[7]董辰,赵增武,李岩,等.Nb含量对高磷耐候钢力学性能的影响[J].稀有金属与硬质合金,2014,42(2):59-63.DONG Chen,ZHAO Zengwu,LI Yan,et al.Effects of Nb content on mechanical properties of the high phosphorus bearing weathering steel[J].Rare Metals and Cemented Carbides,2014,42(2):59-63.
[8]谢天舒,赵增武,李岩,等.Nb元素对耐候钢连续冷却转变及组织变化的影响[J].稀有金属与硬质合金,2014,42(1):38-41.XIE Tianshu,ZHAO Zengwu,LI Yan,et al.Influence of Nb element on continuous cooling transformation and microstructure change of weathering steel[J].Rare Metals and Cemented Carbides,2014,42(1):38-41.
[9]吴红艳,杜林秀,刘相华,等.Mn-Cu耐候钢在模拟工业大气环境下的腐蚀行为[J].东北大学学报(自然科学版),2011,32(10):1418-1422.WU Hongyan,DU Linxiu,LIU Xianghua,et al.Corrosion behavior of Mn-Cu weathering steel in simulated industrial atmosphere environment[J].Journal of Northeastern University(Natural Science),2011,32(10):1418-1422.
[10]彭涛,曹建春,赵吉庆,等.AMS 6308钢中Cu的析出强化[J].材料热处理学报,2016,37(10):126-130.PENG Tao,CAO Jianchun,ZHAO Jiqing,et al.Cu precipitation strengthening in AMS 6308 steel[J].Transactions of Materials and Heat Treatment,2016,37(10):126-130.
[11]李秋鹤,王刚,陈礼清.轧制方式对SUS430铁素体不锈钢组织和性能的影响[J].钢铁,2016,51(10):41-47.LI Qiuhe,WANG Gang,CHEN Liqing.Effects of rolling schedules on microstructures and mechanical properties of SUS430 ferritic stainless steel[J].Iron&Steel,2016,51(10):41-47.
[12]李秋鹤,王刚,邢德茂,等.异步轧制对SUS430铁素体不锈钢织构和深冲性能的影响[J].钢铁钒钛,2016,37(3):131-136.LI Qiuhe,Wang Gang,Xing Demao,et al.Effect of asymmetric rolling on microstructures texture and formability of SUS430 Ferritic Stainless Steel[J].Iron Steel Vanadium Titanium,2016,37(3):131-136.
[13]张建春,左龙飞,蒋金洋,等.耐海水腐蚀钢筋00Cr10Mo V的组织结构及性能研究[J].中国腐蚀与防护学报,2016,36(4):363-369.ZHANG Jianchun,ZUO Longfei,JIANG Jinyang,et al.Microstructure and properties of seawater corrosion resistant rebar steel 00Cr10Mo V[J].Journal of Chinese Society for Corrosion and Protection,2016,36(4):363-369.
[14]张贺佳,陈礼清,李建杰,等.碳化物及合金元素对酸液膜中晶粒腐蚀形态的影响[J].东北大学学报(自然科学版),2016,37(2):189-192.ZHANG Hejia,CHEN Liqing,LI Jianjie,et al.Effect of carbides and alloy elements on grain corrosion morphology in acid liquid film[J].Journal of Northeastern University(Natural Science),2016,37(2):189-192.
[15]CHENG Y F,BULLERWELL J,STEWARD F R.Electrochemical investigation of the corrosion behavior of chromium modified carbon steel in water[J].Electrochimica Acta,2003,48(11):1521-1530.