Mild and severe wear of steels and cast irons in sliding abrasion

Avaliação da perda de massa de revestimento duro depositado por soldagem com arame tubular de liga FeCrC-Ti

“…Então observando a dureza dos revestimentos, em media 665 HV, e a do abrasivo utilizado é confirmado o modo de desgaste severo. Além dos valores de coeficiente de atrito apresentarem resultados superiores a 0,59 durante os ensaios de perda de massa indicam desgaste severo, assim como os resultados encontrados por PINTAUDE et al [29] onde o coeficiente de atrito apresentou uma relação de transição entre desgaste moderado e severo com valor de 0,5 (coeficiente de atrito).…”

Characteristics of Abrasive Particles and Their Implications on Wear

“…It implies that f ab produced by a spherical indenter should be smaller than that estimated for a pyramidal (angular). The small particles tested by Pintaude et al (2009) produced low values of f ab , confirming the possibility that they scratch the surface as spherical particles.…”

“…This reduction did not occur in the same proportion for the roundness factor: only 2.9% of reduction was observed for the shape value. An important aspect of tests performed by Pintaude et al (2009) and Bozzi & De Mello (1999) is that the hardness of abrasive is lower than that of worn material, resulting in a mild wear. In these cases, a possible explanation for the failure of a particle to penetrate another surface is that the geometry of the particle that is not sufficiently hard to produce a scratch on the other material must have undergone a change after its breakage.…”

“…The wear and friction coefficients were presented elsewhere in Pintaude et al (2003) and Pintaude et al (2009), in tests performed under sliding abrasion using pin-on-disk apparatus. The tested materials were obtained from three groups:…”

“…To find μ P , the adhesive component of the friction coefficient is assumed as 0.2, so that this value is reduced from the whole friction coefficient values provided by Pintaude et al (2003Pintaude et al ( , 2009. After the wear tests, the surface roughness of worn pins was determined, using 1.75 mm as sampling length, performed in PERTHOMETER v 6.2 equipment.…”