电镀镍及扩散预处理提高渗硼层韧性

发布时间：2018-02-04 17:31

本文关键词： 电镀镍扩散渗硼断裂韧性热处理　出处：《中国表面工程》2017年02期 　论文类型：期刊论文

【摘要】：渗硼层高温硬度高,抗氧化性能好,但脆性大,提高渗硼层韧性是扩展实际工程应用的关键。文中在45CrNiMoV钢基体上采用电镀镍+高温扩散预处理,在表层形成γ-(Fe,Ni)层后,再用固体渗硼法制备出含镍渗硼层,并与直接渗硼层进行对比。用扫描电镜(SEM)、X射线衍射(XRD)和显微压痕法对镀镍渗硼层的截面形貌,组织结构及硬度分布和断裂韧性进行了研究。结果表明:电镀镍+扩散预处理能显著提高渗硼层的断裂韧性,淬火+低温回火热处理几乎不影响镀镍渗硼层断裂韧性,而对直接渗硼层则有显著降低。镀镍渗硼层中的γ-(Fe,Ni)相能有效缓解冲击载荷,提高渗层断裂韧性。
[Abstract]:The boronizing layer has high hardness at high temperature, good oxidation resistance and high brittleness. Improving the toughness of boronized layer is the key to expand practical engineering application. In this paper, electroplated nickel is pretreated with high temperature diffusion on 45CrNiMoV steel substrate, and 纬 -fen Fe Ni) layer is formed on the surface layer. The nickel boronizing layer was prepared by solid boronizing method and compared with the direct boronizing layer. The cross section morphology of the nickel boronized layer was observed by SEM (SEM) X-ray diffraction (XRD) and microindentation method. The microstructure, hardness distribution and fracture toughness were studied. The results show that the diffusion pretreatment of electroplated nickel can significantly improve the fracture toughness of boronized layer. Quenching and low temperature tempering heat treatment have little effect on the fracture toughness of the nickelized boronized layer, but it can significantly reduce the direct boronizing layer. The 纬 -fen Fe Ni) phase in the nickel-plated boronizing layer can effectively alleviate the impact load. The fracture toughness of infiltrating layer is improved.
【作者单位】：华南理工大学材料科学与工程学院;怀集登云汽配股份有限公司;
【基金】：国家自然科学基金(51271079) 广东省自然科学基金(2015A030313223) 广东省“扬帆计划”引进创新创业团队专项资助项目(21312G02)~~
【分类号】：TQ153.12;TG156.87
【正文快照】： Fund:Supported by National Natural Science Foundation of China(51271079),Natural Science Foundation of Guangdong Province(2015A030313223)and Guangdong Province‘Sail Plan’Introduction of Innovative Entrepreneurial Team Special Funding Project(21312G02)

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