| AISI 310 S stainless steels is widely used in many corrosive environment on account of its excellent corrosion resistance, such as petrochemical, enegy, offshore, biomedical, electricity, mining industries. However, its relatively poor wear resistance seriously restrict its application. Particularlly, in many situations, AISI 310 S stainless steels is subjected combined corrosion and wear, where the synergetic effect causes irreversible damage to installations, machines and devices and bring enormous expense to national economy. Hence, a study of improving the wear resistance of stainless steels under the precondition of ensuring their excellent corrosion resistance is very important and valuable for practical engineering. As an effective effort to improve the wear resistance of stainless steels, precipitated-phase strengthening has been used in many situations. Based on above, in the present work, AISI 310 S stainless steels was heat treated under deffrent conditions to acquire precipitates with deffrent morphology, which can increase the wear resistance of AISI 310 S stainless steels. The effect of heat treatment on the tribocorrosion behavior of 310 S austenitic stainless steels were investigated in various medium. The specific research work is as follow:（1） The influence of heat treatment on the microstructure and wear behavior of AISI 310 S in distilled water was studied. The results showed that precipitates precipitated along the grain boundary and the wear resistance increased with the increase of heat treatment time. The surface morphologie of wear scars on AISI 310 S shows that the main wear was caused by abrasive. With the heat treatment time increase, precipitates precipitated along the grain boundary became more and more and much coarser, which hindered the scratching and abrasion. As a result, less and less furrows and shallows could be observed and the wear resistance increased with the increase of heat treatment time.（2） In 0.5 M H2SO4 solution, experiments were cunducted to investigate the influence of heat treatment on the tribocorrosion behavior of 310 S. The wear was caused by the interaction of abrasive wear associated with delamination fatigue. This is because the heat treatment increased the wear resistance while decreased the corrosion resistance of 310 S, due to the precipitated precipitates. Besides, according the result of synergy effect, we could find that the contributions of synergy effect to the total wear loss were vary small when heat treat time less 20 h, while the contributions increased sharply when the heat treat time continue to increase because of the decrease of the corrosion resistance.（3） The influence of heat treatment on the tribocorrosion behavior of 310 S in 3.5 wt% NaC l solution were investigated. The results showed that AISI 310 S heat treated for 50 h showed the least wear loss. The wear was caused by the interaction of abrasive wear associated with corrosion delamination. This is mainly because of the seepage failure which takes place on the oxide film spontaneously formed on the metallic surface under the condition of C l-. Besides, the precipitates along the grain boundary made the oxide film incomplete, which also decreased the corrosion resistance. Therefore, with the heat treatment time increase, the oxide film suffered more serious damage, decreasing the corrosion resistance of AISI 310 S in NaC l solution. When the heat treatment time increased to more than 50 h, the wear loss provided by corrosion is more than the decrease of wear loss provided by the increasing wear resistance. |
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