Abstract

In this study, AISI 5140 steel samples were borided in an electrical furnace at a temperature of 950°C for 4, 6 and 8 h. Structural examinations, hardness measurement and corrosion tests were performed to determine the effect of the boriding time on the microstructure, hardness and corrosion resistance of the steel surface. It was observed that 4 h of boriding treatment resulted in the forming of Fe₂B layer on the surface of the AISI 5140 steel. However, when the boriding time exceeded 4 h, FeB phase formed on the surface layer of the steel in addition to the Fe₂B phase. It was also observed that both the thickness and hardness of the boride layer increased with the increasing boriding time. The hardness values of the borided sample surface were approximately seven times greater than unborided AISI 5140 steel. The samples subjected to boriding for 4 h showed higher corrosion resistance than the unboriding steel samples. But boriding time of more than 4 h caused a decrease in the corrosion resistance of the AISI 5140 steel.

中文翻译：

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固相硼化时间对AISI 5140钢组织，硬度和腐蚀性能的影响

摘要

在这项研究中，将AISI 5140钢样品在电炉中于950°C的温度下进行了4、6和8小时的硼化处理。进行结构检查，硬度测量和腐蚀测试，以确定硼化时间对钢表面显微组织，硬度和耐腐蚀性的影响。观察到硼化处理的4小时导致在AISI 5140钢的表面上形成Fe ₂ B层。但是，当硼化时间超过4小时时，除了Fe ₂以外，在钢的表层还形成FeB相。B相。还观察到，硼化物层的厚度和硬度均随着硼化时间的增加而增加。渗硼样品表面的硬度值大约是未渗硼AISI 5140钢的7倍。经过渗硼处理4 h的样品显示出比未渗硼的钢样品更高的耐腐蚀性。但是，超过4小时的钎焊时间会导致AISI 5140钢的耐腐蚀性下降。