退火对激光熔覆CoCrFeNiB_(0.5)高熵合金涂层组织与电化学性能的影响
|
摘要
采用激光熔覆在45钢基体上制备了CoCrFeNiB_(0.5)高熵合金涂层,研究了不同退火温度(700、900、1100℃)对涂层组织及性能的影响。结果表明,涂层激光熔覆态相组成主要为fcc相+少量bcc相,显微组织主要为枝晶组织;退火后,相组成转变为fcc+bcc+M_xB的混合相结构;700℃退火后,枝晶略有粗化,更高温度退火使枝晶断开,枝晶组织逐渐消失;1100℃退火后出现明显的颗粒化、球化相组织;激光熔覆涂层显微硬度较高,最高达到603 HV;700、900℃退火后,由于第二相析出强化,涂层显微硬度略有提高,但1100℃退火后涂层显微硬度下降;CoCrFeNiB_(0.5)涂层具有较高的腐蚀电位与较低的腐蚀电流密度,耐腐蚀性能明显优于45钢;1100℃退火后,3.5%NaCl溶液中腐蚀电流密度比45钢基体低3个数量级,具有较好的耐腐蚀性能。
CoCrFeNiB_(0.5)high-entropy alloy coating was prepared on 45 steel substrate by laser cladding.The effects of annealing temperature(700,900,1100℃)on the microstructure and properties of the coatings were studied.The results show that,the laser cladding phase is mainly composed of fcc phase and a small amount of bcc phase,and the microstructure is mainly dendrite.After annealing,the phase composition is converted into a mixed phase structure of fcc+bcc+M_xB.After annealing at 700℃,the dendrite is slightly coarsened.After higher temperature annealing,the dendrite breaks off and the dendrite structure disappears.There is obvious granulation and spheroidization after annealing at 1100℃.The microhardness of laser cladding coating is high,which reaches maximum of 603 HV.After annealing at 700℃and 900℃,the microhardness of the coating increases slightly due to the precipitation and strengthening of the second phase.However,after annealing at 1100℃,the microhardness of the coating decreases.CoCrFeNiB_(0.5)coatings have higher corrosion potential and lower corrosion current density.The corrosion resistance of 45 steel is obviously better than that of 45 steel.After annealing at1100℃,the corrosion current density of the coating in 3.5%NaCl solution is three orders of magnitude lower than that of 45steel substrate,which has good corrosion resistance.
CoCrFeNiB_(0.5)high-entropy alloy coating was prepared on 45 steel substrate by laser cladding.The effects of annealing temperature(700,900,1100℃)on the microstructure and properties of the coatings were studied.The results show that,the laser cladding phase is mainly composed of fcc phase and a small amount of bcc phase,and the microstructure is mainly dendrite.After annealing,the phase composition is converted into a mixed phase structure of fcc+bcc+M_xB.After annealing at 700℃,the dendrite is slightly coarsened.After higher temperature annealing,the dendrite breaks off and the dendrite structure disappears.There is obvious granulation and spheroidization after annealing at 1100℃.The microhardness of laser cladding coating is high,which reaches maximum of 603 HV.After annealing at 700℃and 900℃,the microhardness of the coating increases slightly due to the precipitation and strengthening of the second phase.However,after annealing at 1100℃,the microhardness of the coating decreases.CoCrFeNiB_(0.5)coatings have higher corrosion potential and lower corrosion current density.The corrosion resistance of 45 steel is obviously better than that of 45 steel.After annealing at1100℃,the corrosion current density of the coating in 3.5%NaCl solution is three orders of magnitude lower than that of 45steel substrate,which has good corrosion resistance.
引文
[1] Yeh J W, Chen S K, Lin S J, et al.Nanostructured high-entropy alloys with multiple principal elements:novel alloy design concepts and outcomes[J].Advanced Engineering Materials,2004,6(5):299-303.
[2]杨晓宁,邓伟林,黄晓波,等.高熵合金制备方法进展[J].热加工工艺,2014,43(22):30-33.
[3] He F, Wang Z, Wu Q, et al.Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures[J].Scripta Materialia,2017,126:15-19.
[4] Cornide J, Calvo D M, Chambreland S, et al.Combined atom probe tomography and TEM investigations of Co Cr Fe Ni,Co Cr Fe Ni-Pdx(x=0.5, 1.0, 1.5)and CoCrFeNi-Sn[J].Acta Phys. Pol. A,2015,128(4):557-561.
[5] He F, Wang Z, Wu Q, et al.Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures[J].Scripta Materialia,2017,126:15-19.
[6]李安敏,张喜燕.Al对Al-Cr-Cu-Fe-Ni高熵合金的组织与硬度的影响[J].热加工工艺,2008,37(4):26-28.
[7] Praveen S, Kim H S.High-entropy alloys:Potential candidates for high-temperature applications-An overview[J]. Advanced Engineering Materials,2018,20(1):1-22.
[8]张霞,孙宏飞,郭娜娜,等.多主元高熵合金的研究进展[J].热加工工艺,2013,42(18):13-14.
[9] Chuang M H, Tsai M H, Wang W R, et al.Microstructure and wear behavior of AlxCo1.5Cr Fe Ni1.5Tiy high-entropy alloys[J].Acta Materialia,2011,59(16):6308-6317.
[10]彭振,杜文栋,刘宁,等.激光熔覆Fe Co Cr CuNiMoVSiB高熵合金涂层的制备和性能研究[J].江苏科技大学学报(自然科学版),2017,31(1):35-39.
[11]黄元盛,温立哲.退火处理对Al3CoCrCu0.5Fe MoNiTi高熵合金激光涂层组织和性能的影响[J].表面技术,2016,45(7):162-166.
[12] Miracle D B, Senkov O N.A critical review of high entropy alloys and related concepts[J].Acta Materialia,2017,122:448-511.
[13] Shu F, Tian Z, Zhao H, et al.Synthesis of amorphous coating by laser cladding multi-layer Co-based self-fluxed alloy powder[J].Materials Letters,2016,176:306-309.
[14] Praveen S, Bae J W, Asghari R P, et al.Annealing-induced hardening in high-pressure torsion processed CoCrNi medium entropy alloy[J].Materials Science and Engineering A,2018,734:338-340.
[15] Mane R B, Panigrahi B B.Comparative study on sintering kinetics of as-milled and annealed CoCrFeNi high entropy alloy powders[J].Materials Chemistry and Physics,2018,210:49-56.
[16] Zhang Y, Zhou Y, Lin J, et al.Solid-solution phase formation rules for multi-component alloys[J].Advanced Engineering Materials,2008,10(6):534-538.
[17]董世运,马运哲,徐滨士,等.激光熔覆材料研究现状[J].材料导报,2006,20(6):5-9.
[18] Ding J, Inoue A, Han Y, et al.High entropy effect on structure and properties of(Fe,Co,Ni,Cr)-B amorphous alloys[J].Journal of Alloys and Compounds,2017,696:345-352.
[19]史一功,张铁邦,寇宏超,等.AlCoCrFeNiCu高熵合金的电化学腐蚀性能研究[J].热加工工艺,2011,40(18):1-3.
[2]杨晓宁,邓伟林,黄晓波,等.高熵合金制备方法进展[J].热加工工艺,2014,43(22):30-33.
[3] He F, Wang Z, Wu Q, et al.Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures[J].Scripta Materialia,2017,126:15-19.
[4] Cornide J, Calvo D M, Chambreland S, et al.Combined atom probe tomography and TEM investigations of Co Cr Fe Ni,Co Cr Fe Ni-Pdx(x=0.5, 1.0, 1.5)and CoCrFeNi-Sn[J].Acta Phys. Pol. A,2015,128(4):557-561.
[5] He F, Wang Z, Wu Q, et al.Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures[J].Scripta Materialia,2017,126:15-19.
[6]李安敏,张喜燕.Al对Al-Cr-Cu-Fe-Ni高熵合金的组织与硬度的影响[J].热加工工艺,2008,37(4):26-28.
[7] Praveen S, Kim H S.High-entropy alloys:Potential candidates for high-temperature applications-An overview[J]. Advanced Engineering Materials,2018,20(1):1-22.
[8]张霞,孙宏飞,郭娜娜,等.多主元高熵合金的研究进展[J].热加工工艺,2013,42(18):13-14.
[9] Chuang M H, Tsai M H, Wang W R, et al.Microstructure and wear behavior of AlxCo1.5Cr Fe Ni1.5Tiy high-entropy alloys[J].Acta Materialia,2011,59(16):6308-6317.
[10]彭振,杜文栋,刘宁,等.激光熔覆Fe Co Cr CuNiMoVSiB高熵合金涂层的制备和性能研究[J].江苏科技大学学报(自然科学版),2017,31(1):35-39.
[11]黄元盛,温立哲.退火处理对Al3CoCrCu0.5Fe MoNiTi高熵合金激光涂层组织和性能的影响[J].表面技术,2016,45(7):162-166.
[12] Miracle D B, Senkov O N.A critical review of high entropy alloys and related concepts[J].Acta Materialia,2017,122:448-511.
[13] Shu F, Tian Z, Zhao H, et al.Synthesis of amorphous coating by laser cladding multi-layer Co-based self-fluxed alloy powder[J].Materials Letters,2016,176:306-309.
[14] Praveen S, Bae J W, Asghari R P, et al.Annealing-induced hardening in high-pressure torsion processed CoCrNi medium entropy alloy[J].Materials Science and Engineering A,2018,734:338-340.
[15] Mane R B, Panigrahi B B.Comparative study on sintering kinetics of as-milled and annealed CoCrFeNi high entropy alloy powders[J].Materials Chemistry and Physics,2018,210:49-56.
[16] Zhang Y, Zhou Y, Lin J, et al.Solid-solution phase formation rules for multi-component alloys[J].Advanced Engineering Materials,2008,10(6):534-538.
[17]董世运,马运哲,徐滨士,等.激光熔覆材料研究现状[J].材料导报,2006,20(6):5-9.
[18] Ding J, Inoue A, Han Y, et al.High entropy effect on structure and properties of(Fe,Co,Ni,Cr)-B amorphous alloys[J].Journal of Alloys and Compounds,2017,696:345-352.
[19]史一功,张铁邦,寇宏超,等.AlCoCrFeNiCu高熵合金的电化学腐蚀性能研究[J].热加工工艺,2011,40(18):1-3.