高温合金Inconel 740H在空气和水蒸气环境中的氧化行为
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摘要
对Inconel740H高温合金在700、800、900℃分别进行空气和水蒸气环境下的高温氧化试验,采用热重法、X射线衍射、扫描电镜和能谱仪研究试样。结果表明:长时间空气氧化形成的氧化膜成分与长时间水蒸气的氧化膜类似,氧化物主要由Cr_2O_3、NiCr_2O_4、Al_2O_3与TiO_2组成。合金分别在800、900℃空气中及在800℃水蒸气中的氧化增重与氧化时间近似遵循抛物线规律。水蒸气环境下温度变化对氧化速率的影响要明显高于空气氧化。
High temperature oxidation test was carried out on Inconel 740H superalloy at 700℃,800℃and 900℃in air and water vapor environment.The thermo-gravimetry,X-ray diffraction,scanning electron microscope and EDS were used to study the samples.The results show that the composition of oxide film formed by oxidation in air for long time is similar to the oxide film in water vapor for long time.The oxidation is mainly composed of Cr_2O_3,NiCr_2O_4,Al_2O_3and TiO_2.The oxidation mass gain of the alloy at 800/900℃in air environment and water vapour oxidation mass gain at 800℃approximately obey the parabolic rule.The effect of temperature change on the oxidation rate in water vapor environment is more obvious than that in air oxidation.
High temperature oxidation test was carried out on Inconel 740H superalloy at 700℃,800℃and 900℃in air and water vapor environment.The thermo-gravimetry,X-ray diffraction,scanning electron microscope and EDS were used to study the samples.The results show that the composition of oxide film formed by oxidation in air for long time is similar to the oxide film in water vapor for long time.The oxidation is mainly composed of Cr_2O_3,NiCr_2O_4,Al_2O_3and TiO_2.The oxidation mass gain of the alloy at 800/900℃in air environment and water vapour oxidation mass gain at 800℃approximately obey the parabolic rule.The effect of temperature change on the oxidation rate in water vapor environment is more obvious than that in air oxidation.
引文
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[2]Patel S J,Baker B A,Gollihue R D.Nickel base superalloys for next generation coal fired A-USC power plants[J].Procedia Engineering,2013,55:246-252.
[3]赵双群,谢锡善,董建新,等.700℃超超临界燃煤电站用镍基高温合金Inconel740/740H的组织与性能[C]//第九届电站金属材料学术年会,2011,278-288.
[4]符锐,林富生,赵双群,等.Inconel740H主要强化元素对热力学平衡相析出行为的影响[J].动力工程学报,2013,33(5):405-412.
[5]Majid Abbasi,Dong-Ik Kim,Jae-Hyeok Shim.Effects of alloyed aluminum and titanium on the oxidation behavior of Inconel 740 superalloy[J].Journal of Alloys and Compounds,2016,658:210-221.
[6]Guillou S,Cabet C,Desfranges C.Influence of hydrogen and water vapour on the kinetics of chromium oxide growth at high temperature[J].Oxidation of Metals,2011,76:193-214.
[7]Asteman H,Svensson J E,Norell M,et al.Influence of water vapour and flow rate on the high temperature oxidation of304L:effect of chromium oxide hydroxide evaporation[J].Oxidation of Metals,2000,54(1/2):11-26.
[8]孙朝阳,陈桂才,武传标.典型耐热镍基合金抗高温氧化行为研究[J].腐蚀科学与防护技术,2014,26(4):345-349.
[9]汪峰,Thomas M.Devine.核电站蒸汽发生器传热管用Inconel合金在高温高压水中的腐蚀行为研究[J].腐蚀科学与防护技术,2015(1),27(1):19-24.
[10]赵双群,谢锡善.Inconel740合金在空气和含有水蒸气的空气中的氧化研究[J].动力工程学报,2011,31(10):797-802.
[11]沈嘉年,周龙江,李铁藩.水蒸气加速Fe-Cr合金高温氧化的作用[J].材料研究学报,1998,12(2):128-132.
[12]Evans N D,Maziasz P J,Swindeman R W.Microstructure and phase stability in Inconel alloy 740 during creep[J].Scripta Materialia,2004,51(6):503-507.
[13]Shingledecker J P,Pharr G M.The role of eta phase formation on the creep strength and ductility of Inconel Alloy 740 at1023K(750℃)[J].Metallurgical and Materials Transactions,2012,43:1902-1910.
[14]Chong Yan,Liu Zheng dong,Godfrey A,et al.Microstructure evolution and mechanical properties of Inconel 740H during aging at 750℃[J].Material Science&Engineering,2014,589:153-164.
[15]张红军,周荣灿.先进超超临界用Inconel740合金的组织稳定性研究[J].中国电机学报,2011,31(8):108-113.
[16]郑子杰.700℃超超临界锅炉用740H合金组织稳定性研究[D].上海:上海交通大学,2014.