模具钢表面Co/TiC熔覆层的组织与高温磨损性能

利用6 kW横流CO2激光器制备了Co50熔覆层和不同成分配比的Co/TiC复合涂层来改善H13模具钢表面的热磨损性能。借助X射线衍射(XRD)、扫描电子显微镜(SEM)、显微硬度计和高温摩擦磨损试验机分析了涂层的结合特征、物相组成和不同温度下的摩擦磨损性能。结果表明, 当预置层粉末TiC含量(重量百分比)小于等于20%时, 熔覆层与H13钢基材呈良好的冶金结合; 随着TiC含量的增加, Co/TiC复合涂层截面平均显微硬度呈上升趋势, 但涂层中基体相种类减少: Co＋10%TiC涂层由TiCo3、Cr2Ni3和Cr-Ni-Fe-C组成, Co＋20%TiC涂层由Cr2Ni3和γ-Co组成, Co＋30%TiC涂层为γ-Co固溶体。Co＋20%TiC涂层的高温耐磨性比Co50涂层显著提高, 摩擦系数平稳; 700 ℃时复合涂层的磨损机制主要为氧化磨损和疲劳磨损。结果显示Co＋20%TiC涂层具有良好的综合性能。

Abstract

Co50 alloy coating and Co50 composite coatings doped with different mass fractiones of TiC were prepared by a 6 kW transverse-flow CO2 laser to improve the wear resistance of H13 die steel. The bonding characteristics, phase composition and wear behaviors of the coatings were investigated by X-ray diffractometry(XRD), Scanning Electron Microscopy(SEM) and high-temperature wear tester. The experimental results indicate that Co/TiC composite coatings with the content of TiC less than 20% (weight percentage) show good metallurgical bonding characteristics with the substrate surface. In addition, the micro-hardness of TiC/Co based coatings increases with the TiC content, but matrix phase composition of the composite coatings tends to be simple: Co+10%TiC coating consists of TiCo3, Cr2Ni3 and Cr-Ni-Fe-C phases, while Co+20%TiC coating is Cr2Ni3 and γ-Co, and Co+30%TiC coating mainly is composed of γ-Co solid solution. Co+20%TiC coating shows better wear behavior than Co50 coating, as well as has a more stable friction coefficient. Moreover, the high-temperature wear is mainly caused by oxidation wear and fatigue wear.These results demonstrate that Co+20%TiC composite coating has good comprehensive properties.

参考文献

[1] 周建忠, 刘会霞. 激光快速制造技术及应用［M］. 北京: 化学工业出版社, 2009.

ZHOU J ZH, LIU H X. Laser Rapid Manufacturing Technology and Application［M］. Beijing: Chemical Industry Press, 2009. (in Chinese)

[2] 刘洪喜, 曾维华, 张晓伟, 等. 不锈钢表面多道激光熔覆Ni基涂层的组织与性能［J］. 光学精密工程, 2011, 19(7): 1515-1523.

LIU H X, ZENG W H, ZHANG X W, et al.. Microstructures and properties of multiple-pass laser cladding Ni-based coatings on stainless steel surface［J］. Opt. Precision Eng., 2011, 19(7): 1515-1523. (in Chinese)

[3] 黄凤晓, 江中浩, 刘喜明. 激光熔覆工艺参数对横向搭接熔覆层结合界面组织的影响［J］. 光学精密工程, 2011, 19(2): 316-322.

HUANG F X, JIANG ZH H, LIU X M. Effects of parameters on microstructure of bonding interface formed by overlapping laser cladding ［J］. Opt. Precision Eng, 2011, 19(2): 316-322. (in Chinese)

[4] 刘洪喜, 蔡川雄, 蒋业华, 等. 交变磁场对激光熔覆铁基复合涂层宏观形貌的影响及其微观组织演变［J］. 光学精密工程, 2012, 20(11): 2402-2410.

LIU H X, CAI CH X, JIANG Y H, et al.. Influence of alternative magnetic field on macro morphology and microstructure of laser cladding Fe-based composite coating ［J］. Opt. Precision Eng., 2012, 20(11): 2402-2410. (in Chinese)

[5] ZHAO Y M, WANG J L, MOU J W. Microstructures and properties of Co-based alloy coatings prepared on surface of H13 steel ［J］. China Welding, 2010, 19(3): 41-44.

[6] 朱蓓蒂, 彭英姿, 陶曾毅, 等. H13模具钢表面激光熔覆钴基合金的研究［J］. 特殊钢,1994, 15(5): 38-40.

ZHU B D, PENG Y Z, TAO Z Y, et al.. Study on Co-based alloy laser-cladding of die steel H13 ［J］. Special Steel,1994, 15(5): 38-40. (in Chinese)

[7] 钱星月, 童和强, 张丹莉, 等. H13模具钢表面激光熔覆Co基合金涂层的组织和性能［J］. 冶金丛刊, 2011(5): 1-3.

QIAN X Y, TONG H Q, ZHANG D L, et al.. Microstructure and performance of laser-cladding Co-based alloy coating on the surface of H13 mold steel ［J］. Metallurgical Collections, 2011(5): 1-3. (in Chinese)

[8] HUANG S W, SAMANDI M, BRANDT M. Abrasive wear performance and microstructure of laser clad WC/Ni layers ［J］.Wear,2004,256(11/12): 1095-1105.

[9] 赵静娟, 何占启. 激光熔覆裂纹问题的研究［J］. 新技术新工艺, 2011(10): 58-61.

ZHAO J J, HE ZH Q. Research on status of cracking in laser cladding layer ［J］. New Technology & New Process,2011(10): 58-61. (in Chinese)

[10] 王新林, 漆海滨. 厚层激光熔覆层裂纹控制的综合实验研究与理论分析［J］. 南华大学学报: 理工版, 2001, 15(3): 36-55.

WANG X L, QI H B. Synthetic experiment study and theorematic analysis of crack control of thick laser cladding layer ［J］. Journal of Nanhua University: Science & Engineering Edition, 2001, 15(3): 36-55. (in Chinese)

[11] 石世宏. 激光熔覆工艺与粉末对覆层开裂行为的影响［J］. 表面技术, 1998, 27(4): 27-29.

SHI SH H. Effect of laser cladding process and powders on the cracking behaviors of cladding layer［J］. Surface Technology, 1998, 27(4): 27-29. (in Chinese)

[12] HEMMATI I, OCELK V, HOSSON D J T M. Dilution effects in laser cladding of Ni-Cr-B-Si-C hardfacing alloys ［J］. Materials Letters,2012,84(1): 69-72.

[13] CHEN Y, WANG H M. High-temperature wear resistance of a laser clad TiC reinforced FeAl in situ composite coating［J］. Surface and Coatings Technology, 2004, 179(2/3), 23: 252-256.

[14] KASHANI H, AMADEH A, GHASEMI H M. Room and high temperature wear behaviors of nickel and cobalt base weld overlay coatings on hot forging dies［J］. Wear, 2007, 262(7/8): 800-806.

[15] GUO J S, SU J W, GUANG C S. Research on impact wear resistance of in situ reaction TiCp/Fe composite ［J］. Wear, 2010, 269(3/4): 285-290.

PHAM THI HONGNGA, 刘洪喜, 张晓伟, 王传琦, 蒋业华. 模具钢表面Co/TiC熔覆层的组织与高温磨损性能[J]. 光学精密工程, 2013, 21(8): 2048. PHAM Thi Hongnga, LIU Hong-xi, ZHANG Xiao-wei, WANG Chuan-qi, JIANG Ye-hua. Microstructures and high-temperature wear behaviors of Co/TiC laser coatings on die steel[J]. Optics and Precision Engineering, 2013, 21(8): 2048.

模具钢表面Co/TiC熔覆层的组织与高温磨损性能

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