热处理对铁基激光熔覆层力学及耐腐蚀性能的影响
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摘要
在Q235碳钢上采用脉冲激光器制备出了铁基熔覆层,探究了不同热处理温度(600,750,900℃)对熔覆层的影响,对熔覆层的微观形貌、相组成和力学性能进行了表征,并探究了不同热处理温度下的熔覆层腐蚀行为。结果表明,熔覆层由结晶组织和非晶组织组成,结晶相随热处理温度的升高而增多;热处理会提高熔覆层近表面的硬度,其中经过900℃×2h热处理的熔覆层近表面平均硬度最高,约为1100HV_(0.1);熔覆层的耐腐蚀性能随着热处理温度的上升而提高,其中900℃×2h热处理后的铁基熔覆层具有最高的自腐蚀电位(-0.52500V)和最低的自腐蚀电流密度(2.2810×10~(-6) A/cm~2),耐腐蚀性能最好。
Herein,Fe-based cladding coatings are prepared on Q235 carbon steels using apulsed laser.The effects of heat treatment temperatures of 600℃,750 ℃,and 900 ℃ on these coatings are investigated.In addition,the microstructures,phase compositions,and mechanical properties of these coatings are characterized.Moreover,the corrosion behaviors of these coatings before and after heat treatment are examined.The results show that after heat treatment,the coatings were observed to consist of both crystalline and amorphous structures.The content of the crystalline phase increases with the increase of heat treatment temperature,and heat treatment can increase the near surface hardness of cladding layers,specifically,the average hardness of cladding layers is the highest at approximately 1100 HV_(0.1) under the heat treatment of 900 ℃for 2 h.The anti-corrosion performance of coatings improves with the increase of heat treatment temperature,and the Fe-based cladding layers after heat treatment of900℃ for 2 hshow the highest corrosion potential of-0.52500 V,the lowest corrosion current density of2.2810×10~(-6) A/cm~2,implying the highest anti-corrosion performance.
Herein,Fe-based cladding coatings are prepared on Q235 carbon steels using apulsed laser.The effects of heat treatment temperatures of 600℃,750 ℃,and 900 ℃ on these coatings are investigated.In addition,the microstructures,phase compositions,and mechanical properties of these coatings are characterized.Moreover,the corrosion behaviors of these coatings before and after heat treatment are examined.The results show that after heat treatment,the coatings were observed to consist of both crystalline and amorphous structures.The content of the crystalline phase increases with the increase of heat treatment temperature,and heat treatment can increase the near surface hardness of cladding layers,specifically,the average hardness of cladding layers is the highest at approximately 1100 HV_(0.1) under the heat treatment of 900 ℃for 2 h.The anti-corrosion performance of coatings improves with the increase of heat treatment temperature,and the Fe-based cladding layers after heat treatment of900℃ for 2 hshow the highest corrosion potential of-0.52500 V,the lowest corrosion current density of2.2810×10~(-6) A/cm~2,implying the highest anti-corrosion performance.
引文
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[21] Gu W.Effect of heat treatment on Ni-Al laser cladding layer on 20#steel surface[J]. Laser Technology,2013,37(3):357-361.顾伟.热处理对20#钢表面Ni-Al激光熔覆层的影响[J].激光技术,2013,37(3):357-361.
[22] Wang Q Y,Pu Y W,Liu S,et al.Comparison of hastelloy coating and Fe-based amorphous composite coating prepared by laser cladding on Q235steel[J].Laser&Optoelectronics Progress,2016,53(12):123102.王勤英,蒲雨薇,刘双,等.Q235钢表面激光熔覆哈氏合金涂层及铁基非晶复合涂层的比较[J].激光与光电子学进展,2016,53(12):123102.
[2] Wu W P,Liu J W,Wang H,et al.Microstructure and tribological performance of NiAl-SiC composite coatingbylasercladding[J]. Laser&Optoelectronics Progress,2018,55(9):091406.吴王平,刘剑文,王辉,等.激光熔覆NiAl-SiC复合涂层的组织与摩擦性能[J].激光与光电子学进展,2018,55(9):091406.
[3] Xi Y C,Zhu J B,Liu S,et al.Effect of pulsed current on mechanical and anticorrosion properties of laser cladded coating[J].Laser&Optoelectronics Progress,2018,55(4):043102.西宇辰,朱建波,刘双,等.脉冲电流对激光熔覆层力学及耐腐蚀性能的影响[J].激光与光电子学进展,2018,55(4):043102.
[4] Liu H X,Wang C Q,Zhang X W,et al.Improving the corrosion resistance and mechanical property of 45steel surface by laser cladding with Ni60CuMoW alloy powder[J].Surface and Coatings Technology,2013,228:S296-S300.
[5] Wang Q Y,Xi Y C,Zhao Y H,et al.Effects of laser re-melting and annealing on microstructure,mechanical property and corrosion resistance of Febased amorphous/crystalline composite coating[J].Materials Characterization,2017,127:239-247.
[6] Zhang H,Zou Y,Zou Z D,et al.Effects of chromium addition on microstructure and properties of TiC-VC reinforced Fe-based laser cladding coatings[J].Journal of Alloys and Compounds,2014,614:107-112.
[7] Li J,Zeng K L,Gao F.The effects of Cr3C2-25NiCr on microstructure and properties of iron based laser clad layer[J].Thermal Spray Technology,2012,4(1):36-40.李杰,曾克里,高峰.Cr3C2-25NiCr对铁基激光熔覆层微观组织与性能的影响[J].热喷涂技术,2012,4(1):36-40.
[8] Wang Y F,Li H,Sun X,et al.Microstructures and formationmechanismofFe-basedamorphous coatings by broad-band laser cladding[J].Chinese Journal of Lasers,2018,45(3):0302006.王彦芳,李豪,孙旭,等.宽带激光熔覆铁基非晶涂层的微观组织及形成机制[J].中国激光,2018,45(3):0302006.
[9] Navas C, Colao R,de Damborenea J,et al.Abrasive wear behaviour of laser clad and flame sprayed-melted NiCrBSi coatings[J].Surface and Coatings Technology,2006,200(24):6854-6862.
[10] Wang Q Y,Wang X Z,Luo H,et al.A study on corrosion behaviors of Ni-Cr-Mo laser coating,316stainless steel and X70steel in simulated solutions with H2S and CO2[J]. Surface and Coatings Technology,2016,291:250-257.
[11] Li M X,He Y Z,Sun G X.Laser cladding Co-based alloy/SiCp composite coatings on IF steel[J].Materials&Design,2004,25(4):355-358.
[12] He L H,Zhou F,Yang H Y.Research of in situ synthesis of TiC-TiB2reinforced Co-based composite coating by laser cladding[J].Laser Technology,2013,37(3):306-309.何良华,周芳,杨蕙瑶.激光熔覆原位合成TiC-TiB2增强钴基复合涂层的研究[J].激光技术,2013,37(3):306-309.
[13] Ning S,Bian X F,Tian Y S,et al.Effects of WC on the microstructure and wear resistance of Fe-based laser-cladding coating[J]. Special Casting&Nonferrous Alloys,2008,28(6):422-424,405-406.宁爽,边秀房,田永生,等.WC对铁基激光熔覆层微观组织与磨损性能的影响[J].特种铸造及有色合金,2008,28(6):422-424,405-406.
[14] Song X H,Zou Y F,Xing J K,et al.Comparison between laser cladding Fe-based and Ni-based alloy coatings on 35CrMo[J].Laser Technology,2015,39(1):39-45.宋新华,邹宇峰,邢家坤,等.35CrMo激光熔覆铁基合金与镍基合金涂层性能比较[J].激光技术,2015,39(1):39-45.
[15] Fu Z K,Wang W J,Ding H H,et al.Effect of laser cladding Fe-based alloy on wear performance of wheel and rail steels[J].Transactions of Materials and Heat Treatment,2015,36(8):217-222.付志凯,王文健,丁昊昊,等.激光熔覆铁基合金对轮轨材料磨损与损伤性能的影响[J].材料热处理学报,2015,36(8):217-222.
[16] Chen Q J,Guo S B,Yang X J,et al.Study on corrosion resistance of Fe-based amorphous coating by laser cladding in hydrochloric acid[J].Physics Procedia,2013,50:297-303.
[17] Gong F B,Shen J,Gao R H,et al.Influence of heat treatmentonmicrostructureandmechanical properties of FeCrNi coating produced by laser cladding[J]. Transactions of Nonferrous Metals Society of China,2016,26(8):2117-2125.
[18] Wang J,Wu X L,Hong Y S.High temperature tempered microstructure and wear resistance of laser cladded iron-based alloy coating[J].Journal of Iron and Steel Research,2000,12(3):51-54.王军,武晓雷,洪友士.铁基合金激光熔覆涂层的高温回火组织及其磨损性能[J].钢铁研究学报,2000,12(3):51-54.
[19] Xiong W,Zhang Q M,Xia Q,et al.Effect of heat treatment on the microstructure and properties of laser cladding alloy[J].Applied Laser,2013,33(3):233-238.熊炜,张庆茂,夏琪,等.高温热处理对激光熔覆合金层组织与性能的影响[J].应用激光,2013,33(3):233-238.
[20] Zhai Y J,Qiao S J,Lu X L,et al.Effects of heat treatment on mechanical properties ofγ-(Ni,Fe)/CrB/hBNself-lubricationanti-wearcomposite coatings by laser cladding[J]. Transactions of Materials and Heat Treatment,2015,36(12):229-235.翟永杰,乔世杰,陆小龙,等.热处理对激光熔覆γ-(Ni,Fe)/CrB/hBN自润滑耐磨复合涂层力学性能的影响[J].材料热处理学报,2015,36(12):229-235.
[21] Gu W.Effect of heat treatment on Ni-Al laser cladding layer on 20#steel surface[J]. Laser Technology,2013,37(3):357-361.顾伟.热处理对20#钢表面Ni-Al激光熔覆层的影响[J].激光技术,2013,37(3):357-361.
[22] Wang Q Y,Pu Y W,Liu S,et al.Comparison of hastelloy coating and Fe-based amorphous composite coating prepared by laser cladding on Q235steel[J].Laser&Optoelectronics Progress,2016,53(12):123102.王勤英,蒲雨薇,刘双,等.Q235钢表面激光熔覆哈氏合金涂层及铁基非晶复合涂层的比较[J].激光与光电子学进展,2016,53(12):123102.