Microstructure and corrosion behaviour of plasma‐nitrocarburized sintered steel

Abstract

Powder characteristics and manufacturing processes determine the microstructure, and therefore, the physical, chemical, and mechanical properties of sintered steels. In particular, porosity and corrosion resistance are intimately related, since the contact area between substrate and electrolyte significantly affects the corrosion resistance of sintered steels. This study addresses the effect of powder characteristics and pressing parameters on the microstructure and corrosion resistance of low-carbon sintered and sintered/plasma-nitrocarburized steel. The results indicated that the corrosion resistance increased with increasing density and decreasing specific surface area. Additionally, plasma-nitrocarburizing was highly effective in coating open pores of the material.

Role of plasma nitriding temperature and time in the corrosion behaviour and microstructure evolution of 15-5 PH stainless steel

“…The identification assigned to each sample and the respective processing conditions is shown in Table 1. This reactor was similar to reactor used in Borges [15].…”

Solution heat treatment of plasma nitrided 15-5PH stainless steel - Part I: Improvement of the corrosion resistance

“…The respective processing conditions are shown in Table 2. The reactor used was similar to that used by Borges et al [13], Maliska et al [14], Borges et al [15] and Bernardelli et al [16]. This condition was identified as N.…”

Engenharia mecânica e suas aplicações

“…As análises de Difração de Raios-X, para determinar as fases presentes na camada nitretada, foram realizadas em um difratômetro de Raios-X BRUKER (modelo D2 PHASER, radiação Cu-K (λ = 1.55418 Å)), operando com tubo de alvo de cobre a uma tensão de 30,0 kV e 10,0 mA de corrente, ângulo de varredura (2θ) de 30º a 70º com passo angular de 0,02º. (BORGES et al, 2004). Isto leva ao aumento da distância média entre os precipitados e, consequentemente, facilita o movimento das discordâncias, fazendo com que haja uma diminuição da microdureza (DOSREIS et al, 2008).…”