Co对马氏体时效硬化不锈钢组织和性能的影响
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摘要
利用光学显微镜(OM)、拉伸试验和硬度测试研究了合金元素Co对马氏体时效硬化不锈钢固溶态和时效态显微组织和性能的影响。结果表明:在1040～1100℃固溶时,晶粒尺寸随温度升高而增大;含Co钢晶粒尺寸和马氏体板条束尺寸均小于不含Co试验钢。力学性能测试表明:固溶温度对固溶态试验钢的硬度几乎没有影响;随时效温度升高,钢的强度和硬度减小,伸长率增大;时效处理后含Co钢的强度和硬度均大于不含Co试验钢,伸长率变化则不明显。加入Co元素的试验钢具有良好的综合力学性能。
Effect of alloying element Co on the microstructure and mechanical properties of maraging stainless steel after solution and aging treatment was studied by means of optical microscopy (OM),tensile test and microhardness test. The results show that grain size grows larger with the increase of solution temperature. After adding cobalt,the size of the grain and martensitic slabs in the test steel are smaller than that of the non-cobalt-alloyed steel. Mechanical properties analysis show that the solution temperature has almost no influence on the hardness of the steels; with the increase of aging temperature,the strength and hardness of steels decrease,and the elongation increases.Besides,the strength and hardness of steel containing cobalt are higher than that of the non-alloyed steel after aging treatment,but the elongation has no obvious change. In a word,Adding cobalt can improve the mechanical properties of the maraging stainless steel.
Effect of alloying element Co on the microstructure and mechanical properties of maraging stainless steel after solution and aging treatment was studied by means of optical microscopy (OM),tensile test and microhardness test. The results show that grain size grows larger with the increase of solution temperature. After adding cobalt,the size of the grain and martensitic slabs in the test steel are smaller than that of the non-cobalt-alloyed steel. Mechanical properties analysis show that the solution temperature has almost no influence on the hardness of the steels; with the increase of aging temperature,the strength and hardness of steels decrease,and the elongation increases.Besides,the strength and hardness of steel containing cobalt are higher than that of the non-alloyed steel after aging treatment,but the elongation has no obvious change. In a word,Adding cobalt can improve the mechanical properties of the maraging stainless steel.
引文
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[3]姜雯.超级马氏体不锈钢组织性能及逆转变奥氏体机制的研究[D].昆明理工大学,2014.
[4]刘振宝,杨志勇,李全安,等.一种超高强度马氏体时效不锈钢的组织转变对力学性能的影响[J].热处理,2005,20(3):11-16.Liu Zhenbao,Yang Zhiyong,Li Quan'an,et al.Effect of structure transformation in a ultra-high strength maraging stainless steel on its mechanical properties[J].Heat Treatment,2005,20(3):11-16.
[5]Decker R F,Eash J T,Goldman A J.18%nickel maraging steel[J].Trans ASM,1962,55(1):58.
[6]余强,范云鹰,刘振宝,等.时效处理对15-5PH沉淀硬化不锈钢组织及性能的影响[J].金属热处理,2013,38(9):16-21.Yu Qiang,Fan Yunying,Liu Zhenbao,et al.Effects of aging on microstructure and mechanical properties of 15-5PH precipitation hardened stainless steel[J].Heat Treatment of Metals,2013,38(9):16-21.
[7]An Verdiere,Christina Hofer,Sam De Waele,et.al.Precipitation in simultaneously nitrided and aged Mo-containing maraging steel[J].Materials Characterization,2017,131:21-25.
[8]李蓉.Ti含量对00Cr12Ni9Mo4Cu马氏体时效不锈钢组织和硬度的影响[D].杭州:浙江大学,2008.
[9]姜越.马氏体时效不锈钢合金化设计与组织性能[M].哈尔滨工业大学出版社,2007,75-87.
[10]邓德伟,陈蕊,田鑫,等.热处理对PH17-4沉淀硬化马氏体不锈钢显微组织及性能的影响[J].金属热处理,2013,38(4):32-37.Deng Dewei,Chen Rui,Tian Xin,et al.Influence of heat treatment on microstructure and properties of 17-4PH martensitic stainless steel[J].Heat Treatment of Metals,2013,38(4):32-37.
[11]Zhou Yongheng,Zhao Kunyu,Liu Xin,et al.The influence of heat treatment on microstructure and properties of 00Cr15Ni7Mo2Cu2supermartensite stainless steel[C]//Advanced Materials Research.Trans Tech Publications,2012,399:211-215.
[12]Arpana S Murthy,Julia E Medvedeva,Diwer Isheim,et al.Copper precipitation in cobalt-alloyed precipitation-hardened stainless steel[J].Scripta Materialia,2012,66(11):943-946.
[13]李科欣,邹德宁,张威,等.时效温度对Co-Cu合金化马氏体时效硬化不锈钢组织性能的影响[J].金属热处理,2017,11(42):73-75.Li Kexin,Zou Dening,Zhang Wei,et al.Effect of aging temperature on microstructure and properties of Co-Cu alloying maraging hardening stainless steel[J].Heat Treatment of Metals,2017,11(42):73-75.
[14]Qin B,Wang Z Y,Sun Q S.Effect of tempering temperature on properties of 00Cr16Ni5Mo stainless steel[J].Materials Characterization,2008,59(8):1096-1100.
[15]孟倩.钴对304不锈钢组织与性能的影响[D].兰州:兰州理工大学,2009.
[16]H?ttestrand M,Nilsson J O,Stiller K,et al.Precipitation hardening in a 12%Cr-9%Ni-4%Mo-2%Cu stainless steel[J].Acta Materialia,2004,52(4):1023-1037.