2205双相不锈钢包埋粉末渗硼性能研究  

Properties of Pack Boriding for 2205 Duplex Steel

作　　者：刘凯[1] 周芳[1] 罗宏[1,2] 林修洲[1,2] 陈雪丹[1,2] 

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：《表面技术》2016年第4期183-188,共6页Surface Technology

基　　金：四川理工学院特色学科方向培育工程项目(2014TS12)~~

摘　　要：目的提高2205双相不锈钢的硬度和耐蚀性能。方法 2205双相不锈钢采用固体包埋粉末渗硼,于马沸炉中分别在830、860、890℃下保温5 h;在860℃下保温3、5、7 h,随炉冷却到室温。用金相显微镜、扫描电镜观察渗硼层的形貌和测定渗硼层的厚度,用维氏硬度计测定渗硼层的硬度,用纳米压痕仪测定渗硼层不同深度的硬度,用X射线衍射仪分析渗硼层的物相组成,评定渗硼层与基体的结合力,做不同介质下耐蚀性对比试验。结果渗硼层与基体结合牢固,破坏等级评为一级,渗硼层主要由Fe2B单相组成。在860℃下保温不同时间,渗硼层的厚度及硬度均随时间的增长而逐渐增大;在不同温度下保温5h时,渗硼层的厚度及硬度随温度的升高而逐渐增大。渗硼后试样在质量分数都为10%的HCl和Na Cl溶液中耐蚀性提高,在质量分数均为10%的H_2SO_4、NaOH和HNO_3溶液中耐蚀性变差。结论固体粉末包埋法渗硼工艺改善了2205双相不锈钢的表面组织和性能,有效提高了其硬度及耐蚀性。Objective To improve the hardness and corrosion resistance of 2205 duplex steel. Methods Solid powder embedding boronizing was conducted for 2205 duplex steel and kept warm for 5 h in muffle furnace at 830 ℃,860 ℃,890 ℃ respectively; and cooled to room temperature with the furnace after insulation at 860 ℃ for 3 h,5 h,7 h. The cross-section morphology of the boriding layer and the thickness of the boriding layer were analyzed by metallography and SEM. The surface hardness of boriding layer was tested by Vickers hardness tester,the hardness at different depth of boriding layer was tested by Nanoindentation tester,the phase structure of boriding layer was analyzed by X-ray diffraction,and the binding force of the boriding layer and substrate was evaluated. Comparative corrosion resistance tests of the boriding layer were conducted in different mediums. Results The boriding layer was firmly bonded to the substrate as the dentate structure,and the damage grade was 1. The boriding layer was mainly composed of Fe2 B. When the temperature was 860 ℃,the thickness and hardness of the boriding layer gradually increased with time. When the time was 5 h,the thickness of the boriding layer gradually increased with temperature,but the hardness of the boriding layer increased at first and decreased later with increasing temperature. The corrosion resistance of the sample after the boriding treatment increased in 10% HCl and 10% Na Cl but decreased in 10% H2SO4,10% NaOH,10% HNO3. Conclusion Solid powder embedding boronizing process improved the surface microstructure and properties of 2205 duplex steel,and it could effectively improve the hardness and corrosion resistance of 2205 duplex steel.

关 键 词：2205双相不锈钢 包埋粉末渗硼 纳米压痕 厚度 硬度 结合力 耐蚀性 

分 类 号：TG174.445[金属学及工艺—金属表面处理]