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Effect of Aging Temperature on the Microstructure, Local Mechanical Properties, and Wear Behavior of a UNS S32750 Super Duplex Stainless Steel
Journal of Materials Engineering and Performance ( IF 2.2 ) Pub Date : 2020-11-23 , DOI: 10.1007/s11665-020-05332-5
Bouzid Maamache , Billel Cheniti , Brahim Belkessa , Karima Tahar-chaouch , Ramdhane Kouba

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.



中文翻译:

时效温度对UNS S32750超级双相不锈钢的显微组织,局部力学性能和磨损行为的影响

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。

更新日期:2020-11-25
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