Abstract

The main objective of this research was to examine the effect adding B at 0, 100, 170 ppm had on the mechanical properties, wear and corrosion behaviour (in two different corrosive media) of cast 304 stainless steels. The microstructures, wear surface and corrosion morphologies were examined by optical microscopy, X-ray diffraction analyses and scanning electron microscopy (SEM). The cast 304 stainless steels with boron addition as 0, 100, 170 ppm, were used to investigate their corrosion behaviours by electrochemical potentiodynamic polarisation capacities in 5% HCl and 5% HNO₃ solutions at laboratory environment. Wear tests were conducted in a pin-on-disc type wear tester. Optimum properties in relations of improved strength and wear resistance without loss in hardness were obtained when the cast 304 stainless steel contained 100 ppm B. At B contents higher than 100 ppm decrease of the hardness was accompanied an increase in strength and wear resistance. It was found that wear loss cast 304 stainless steel with B addition decreased with the increase of sliding distance, when compared with 0 ppm B addition cast 304 stainless steel. With regard to results of the corrosion experiment, I_cor tended to decrease the addition 110 ppm B in 5% HCl solution, leading to a rise in the corrosion resistance. Adding B to the cast 304 stainless steels helped to enhance its corrosion resistance, except that its intergranular corrosion resistance reduced, which can be seen by examining the corrosion morphology. The improved wear behaviour and corrosion resistance of cast 304 stainless steel was attributed to the adding boron cast 304 stainless steel.

中文翻译：

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含硼铸造304不锈钢的腐蚀，磨损和力学性能

摘要

这项研究的主要目的是研究在0、100、170 ppm下添加B对铸造304不锈钢的机械性能，磨损和腐蚀行为（在两种不同的腐蚀介质中）的影响。通过光学显微镜，X射线衍射分析和扫描电子显微镜（SEM）检查了显微组织，磨损表面和腐蚀形态。硼添加量分别为0、100、170 ppm的铸造304不锈钢用于通过在5％HCl和5％HNO _3中的电化学势动力极化能力研究其腐蚀行为实验室环境中的解决方案。磨损测试在针盘式磨损测试仪中进行。当铸造的304不锈钢包含100ppm的B时，获得了在不降低硬度的情况下在强度和耐磨性方面具有最佳关系的最佳性能。当B含量高于100ppm时，硬度降低而使强度和耐磨性增加。发现与0ppm的B添加铸造304不锈钢相比，添加B添加的磨损损失铸造304不锈钢随着滑动距离的增加而降低。关于腐蚀试验的结果，我_肺心病倾向于减少在5％HCl溶液中110 ppm B的添加，从而导致耐腐蚀性的提高。将B添加到铸造304不锈钢中有助于提高其耐腐蚀性，但其晶间耐腐蚀性降低，这可以通过检查腐蚀形态来看出。铸造304不锈钢的改善的耐磨性和耐腐蚀性归因于硼铸造304不锈钢的添加。