激光引燃合成Fe-Al掺杂Cr粉合金的组织及性能
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摘要
采用激光引燃自蔓延高温合成的方法,在Fe70Al30粉末中分别添加质量分数为0%、5%、10%、15%和20%的Cr粉,压制成坯,制备出Fe-Al复合材料。利用X射线衍射仪、金相显微镜等表征手段及孔隙率、硬度、磨损和腐蚀性能等性能测试方法,得到了不同Cr含量对烧结合金显微组织及性能的影响规律。结果表明:烧结合金主要物相为Fe_3Al、FeAl、AlCrFe_2、Al_8Cr_5、Al_2O_3和Cr_2O_3。随着Cr含量增加,合金的孔隙率先减小再增大,最小值为12.58%。当Cr含量为10%时,合金显微硬度最高,达到876.4HV,磨损率最低为0.65g/mm~2,自腐蚀电流密度最小为20.32mA/cm~2,耐腐蚀性能最好。
In order to obtain high performance Fe-Al alloy material, chromium powder with mass fraction of 0%, 5%, 10%, 15% and 20% were added into Fe70 Al30 powder and Fe-Al based composite materials were prepared by laser ignition self-propagating high temperature synthesis. Effects of chromium powder content on microstructure and properties of sintered alloy were obtained by the means of microstructure characterization such as X-ray diffraction and optical microscope and performance test methods of porosity, hardness, wear resistance and corrosion resistance. It is found that the main product phases of the sintered alloy are Fe_3Al、FeAl、AlCrFe_2、Al_8Cr_5、Al_2O_3 and Cr_2O_3. With the increase of Cr content, the porosity of the alloy decreased first and then increased and the minimum is 12.58%. When the content of chromium powder is 10%, the microhardness of the sintered alloy is the highest, reaching 876.4 HV, the wear rate is lowest with 0.65 g/mm~2, the corrosion current density is minimum with 20.32 mA/cm~2, and the corrosion resistance is the best.
In order to obtain high performance Fe-Al alloy material, chromium powder with mass fraction of 0%, 5%, 10%, 15% and 20% were added into Fe70 Al30 powder and Fe-Al based composite materials were prepared by laser ignition self-propagating high temperature synthesis. Effects of chromium powder content on microstructure and properties of sintered alloy were obtained by the means of microstructure characterization such as X-ray diffraction and optical microscope and performance test methods of porosity, hardness, wear resistance and corrosion resistance. It is found that the main product phases of the sintered alloy are Fe_3Al、FeAl、AlCrFe_2、Al_8Cr_5、Al_2O_3 and Cr_2O_3. With the increase of Cr content, the porosity of the alloy decreased first and then increased and the minimum is 12.58%. When the content of chromium powder is 10%, the microhardness of the sintered alloy is the highest, reaching 876.4 HV, the wear rate is lowest with 0.65 g/mm~2, the corrosion current density is minimum with 20.32 mA/cm~2, and the corrosion resistance is the best.
引文
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[2] 李亚敏,刘洪军,等.金属型铸造Fe3Al金属间化合物的组织和力学性能[J].材料科学与工程学报,2010,28(2):175～180.
[3] Pint.B.A,Zhang Y,Walker L R,Wright I G.Long-term performance of aluminide coatings on Fe-base alloys [J].Surface & Coatings Technology,2007,202(4):637～642.
[4] 赵荣达,朱景川,来忠红,等.低温时效对Fe-22Al合金微观组织和力学性能的影响 [J].材料导报,2015,29(8):110～113.
[5] Deevi S C,Sikka V K.Nickel and iron aluminides:an overview on properties,processing,and applications [J].Intermetallics,1996,4(5):357～375.
[6] 闫石,金洙吉,马兴伟.高能球磨时间对Fe-Al粉末合金化组织转变的影响 [J].粉末冶金工业,2009,19(6):13～17.
[7] 钟庆东,勒霞文,纪丹,等.铁铝金属间化合物的研究进展 [J].粉末冶金技术,2014,32(6):457～463.
[8] 王建,汤慧萍,邢建东,等.Fe-Al 金属间化合物研究概况与发展方向 [J].稀有金属材料与工程,2011,40(s2):545～549.
[9] Panda D,Bhuyan P,Kumar L,Alam S N.Synthesis of Fe3Al intermetallic compound by mechanical alloying[J].Arabian Journal for Science & Engineering,2017:1～11.
[10] 王杰丰,贺跃辉,高海燕,等.FeAl多孔材料制备过程中烧结气氛对Al元素挥发及其抗水腐蚀的影响[J].粉末冶金材料科学与工程,2014(3):467～472.
[11] 李刚,韩凤,葛少成.Fe(50-x/2)Al(50-x/2)Crx体系掺杂钨精矿粉激光烧结合金组织及性能研究[J].稀有金属材料与工程,2016(6):1505～1508.
[12] 李强,姜春兰,杜烨.富铝Fe-Al粉末的热压烧结工艺及组织研究[J].功能材料,2014,45(20):20138～20141.
[13] 常宇宏,贾成厂.机械合金化与放电等离子烧结制备Fe-Fe3Al材料[J].材料科学与工艺,2012,20(2):90～95.
[14] 李刚,张井波,张明,等.Alx-(Cr-Fe)100-x系激光烧结合金的组织与性能 [J].金属热处理,2016,41(10):57～61.
[15] 杨森,杨绍斌,董伟.钨精矿粉含量对激光自蔓延烧结Fe/Al合金组织及性能的影响[J].材料保护,2016,49(3):1～3.
[16] Hamana D,Amiour L,Bouchear M.Effect of chromium ternary additions on the ordering behaviour in Fe-28at.% Al alloy [J].Materials Chemistry & Physics,2008,112(3):816～822.
[17] Ortega Y,Diego N D,Plazaola F,J.del Río.Influence of Cr addition on the defect structure of Fe-Al alloys [J].Intermetallics,2007,15(2):177～180.
[18] 张志刚,张学军,潘太军,等.Fe-Al和Fe-Cr-Al合金在高温下的初期氧化 [J].钢铁研究,2007,35(3):38～42.
[19] Paul A,Dal M A,Kodentsov A A,Loo F J J V.The kirkendall effect in multiphase diffusion [J].Acta Materialia,2000,52(3):623～630.
[20] 朱胜利,张惠斌,江垚,等.添加Cr合金化FeAl金属间化合物多孔材料的制备及性能[J].粉末冶金材料科学与工程,2016,21(3):427～433.