20钢包埋粉末渗硼层的组织及耐蚀性能研究  

Research on Structure and Corrosion Resistance of Pack Boronized Layer for 20 Steel

作　　者：周芳[1] 刘凯[1] 罗宏[1,2] 林修洲[1,2] 罗昌森[1,2] 陈一碧 ZHOU Fang LIU Kai LUO Hong LIN Xiuzhou LUO Changsen CHEN Yibi(Institute of Materials Science and Chemistry Engineering, Sichuan Universty of Science and Engineering, Zigong 643000, China Key Laboratory of Material Corrosion and Protection of S ichuan Province, Zigong 643000, China)

机构地区：[1]四川理工学院材料与化学工程学院,四川自贡643000 [2]材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《热加工工艺》2017年第2期164-168,共5页Hot Working Technology

基　　金：四川理工学院特色学科方向培育工程项目(2014TS12)

摘　　要：研究了20钢在不同渗硼温度和不同渗硼时间下对渗硼层组织和性能的影响。用金相显微镜和扫描电镜观察了渗硼层的形貌,测定了渗硼层的厚度;用维氏硬度计测定了渗硼层的硬度;用纳米压痕仪测定了渗硼层不同深度的硬度;评定了渗硼层与基体的结合力;采用X射线衍射仪分析了渗硼层的物相组成;在不同溶液中进行了渗硼层耐蚀性试验。结果表明:渗硼层厚度均匀,呈齿状结构,与基体结合牢固,渗硼层主要由Fe_2B组成。在860℃下保温不同时间,渗硼层的厚度随时间的增长而增大;在不同温度下保温5h时,渗硼层的厚度随温度的升高而逐渐增大。渗硼层表层硬度稍低,然后升高达到最大值,在渗层与过渡区的交界处急剧下降。除HNO_3外,渗硼处理后的试样在HCl、H_2SO_4、NaCl和NaOH溶液中的耐蚀性均比未渗硼的试样好。The effects of pack boronized at different temperature and time on the microstmcmre and properties of boronized layer on 20 duplex steel were studied. The morphology of the boride layer was observed by metallographic microscope and SEM. The thickness of the boride layer was tested. The hardness of the boride layer was tested by Vickers hardness tester. The hardness of the boronized layer under different thickness was tested by nanoindentation tester. The binding force of the boride layer and substrate was evaluated. The phase phase composition of the boride layer was analyzed by X-ray diffraction. The corrosion resistance tests of the boride layer in different solution were carried out. The results show that： the thickness of the boronizing layer is uniform. The boride layer with dentate structure is firmly bonded to the substrate. The boride layer is mainly composed of Fe2B. When holding at 860℃ for different time, the thickness of the boronizing layer gradually increases with time increasing. When holding at different temperatures for 5 h, the thickness of the boronizing layer gradually increases with temperature increasing. The surface hardness of the boronizing layer is lower, and then the hardness reaches the maximum value, and falls sharply in the junction area of carbonitriding layer and transition layer. Except in HNO3, the samples after boronizing treatment has better corrosion resistance in HCl, H2SO4, NaCl and NaOH solution, compared with samples without boronizing treatment.

关 键 词：20钢 包埋粉末渗硼 组织 耐蚀性 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG113.231[金属学及工艺—金属学]