In this paper, the effect of aging temperature on the microstructure, local mechanical properties and wear behavior of a UNS S32750 super duplex stainless steel is investigated. A massive preferential precipitation of σ phase and Cr₂N is detected at the periphery of ferrite with an increase in their extent as aging temperature increases. Simultaneously, the δ phase decomposition is accentuated with temperature and reaches its maximum at 850 °C. This behavior results in an enhancement in hardness and Young’s modulus accompanied by a higher plasticity ratio. The wear resistance of the aged samples is investigated in terms of friction coefficients and wear rates against two counterparts. The wear performance follows σ phase presence, the higher σ phase extent, the higher the wear resistance. It is found that the change in wear mechanisms in the 850 °C aged samples from abrasive against AISI-304L counterpart to adhesive-oxidative against Al₂O₃ counterpart is responsible in the increase in wear resistance.

本文研究了时效温度对UNS S32750超级双相不锈钢的组织，局部力学性能和磨损行为的影响。随着时效温度的升高，在铁素体的周围会发现大量的σ相和Cr ₂ N优先析出，其程度也随之增加。同时，δ相分解随温度而加剧，并在850°C达到最大值。这种行为导致硬度和杨氏模量的提高，同时具有更高的可塑性比。根据两个试样的摩擦系数和磨损率研究了老化试样的耐磨性。耐磨性能遵循σ相的存在，σ相的程度越高，耐磨性越高。已经发现，在850°C时效的样品中，磨损机理从抗AISI-304L对应的磨料变为抗Al ₂ O ₃对应的胶粘剂的氧化，是导致耐磨性提高的原因。