K282合金的高温氧化行为研究
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摘要
采用DTA、XRD、SEM和EDX研究K282合金在700℃、800℃和900℃大气环境下氧化动力学行为。结果表明,700℃氧化时,氧化初期增重速度较快,之后增重速度变慢,材料只发生了外氧化,氧化层产物为Cr_2O_3。在800℃和900℃氧化时,合金的氧化增重遵循抛物线规律,合金发生了内氧化,内氧化产物为Al_2O_3,外氧化层产物为Cr_2O_3和TiO_2。合金氧化速率由金属离子和氧离子在氧化膜中的扩散速度决定,温度越高扩散速度越快,合金氧化增重速度越快。
High temperature oxidation behaviors of cast K282 alloy at 700℃ 800℃ and 900℃ in air environment are investigated by DTA,XRD,SEM and EDX.The results show that there is a faster gain weight rate at the initial oxidation stage,and it becomes slow subsequently at 700℃.And there is only external oxide scale composed of Cr_2O_3.The oxidation kinetic curves of K282 obey the parabolic law at 800 and 900℃.The internal oxidation of the alloy occurred and internal oxide Al_2O_3 was formed at 800℃ and 900℃,and the external oxide scale is composed of Cr_2O_3 and TiO_2.Gain weight rate depends on the diffusion speed of metal ion and oxygen ion.The diffusion speed increases with the increasing of temperature,causing a faster gain weight rate.
High temperature oxidation behaviors of cast K282 alloy at 700℃ 800℃ and 900℃ in air environment are investigated by DTA,XRD,SEM and EDX.The results show that there is a faster gain weight rate at the initial oxidation stage,and it becomes slow subsequently at 700℃.And there is only external oxide scale composed of Cr_2O_3.The oxidation kinetic curves of K282 obey the parabolic law at 800 and 900℃.The internal oxidation of the alloy occurred and internal oxide Al_2O_3 was formed at 800℃ and 900℃,and the external oxide scale is composed of Cr_2O_3 and TiO_2.Gain weight rate depends on the diffusion speed of metal ion and oxygen ion.The diffusion speed increases with the increasing of temperature,causing a faster gain weight rate.
引文
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[2] 周兰章.700℃超超临界机组耐热材料的研制现状及选材思考[C]//国家700℃计划耐热材料第一次专题研讨会论文集.北京:国家700℃超超临界燃煤发电技术创新联盟秘书处编印,2011:13.
[3] Wang C S,Guo Y A,Guo J T,et al.Investigation and improvement on structural stability and stress rupture properties of a Ni-Fe based alloy[J].Mater.Des,2015,88:790-798.
[4] Viswanathan R,Sarver J,Tanzosh J M.Boiler materials for ultra-supercritical coalpowerplants—Steamside oxidation[J].Journal of Materials Engineering & Performance,2006,15(3):255-274.
[5] K L Kruger.Materials for ultra super criticaland advanced ultra-supercritical powerplants.HAYNES-282 alloy[M].American:Woodhead Publishing,2017:511-545.
[6] 彭建强.700℃及以上等级超超临界汽轮机用高温铸件材料探讨[C]//中国动力工程学会.超超临界机组技术交流2013年会论文集.天津:中国动力工程学会,2013:5.
[7] 刘强永.Haynes282耐热合金组织与性能研究[D].昆明:昆明理工大学,2015.
[8] Jeffrey A Hawk,Tian-Le Cheng,John S Sears,et al.Gamma Prime Stability in Haynes282 Theoretical and Experimental Considerations[J].Journal of Materials Engineering andPerformance,2015,24(11):4171-4181.
[9] 谢奕心,程晓农,徐桂芳,等.高温合金 Inconel 740H 在空气和水蒸气环境中的氧化行为[J].热加工工艺,2018,47(14):55-59.
[10] Tunthawiroon P,Li Y,Tang N,et al.Effects of alloyed Si on the oxidation behaviourof Co-29Cr- 6Mo alloy for solid-oxide fuelcell interconnects[J].Corrosion Science,2015,95:88-99.
[11] 李美栓.金属的高温腐蚀:氧化物的基本性质、结构与缺陷:第一版[M].北京:冶金工业出版社,2001:42-77.
[12] J Brenneman,J Wei,Z Sun,et al.Oxidation behavior of GTD111 Ni-based superalloy at 900℃ in air[J].Corrosion Science,2015,100:26-27.