Internal cracking with crystal lattice failure of 2.93wt%Cr-Mn-Cu-Si iron under impact-abrasion

Abstract

As studies about materials having high resistance to impact-abrasion grow increasingly, a developed 2.93 wt%Cr-Mn-Cu-Si iron was tested under dry impact-abrasion. Apparatus involve repeated impact of a pin specimen on a rotating wheel with abrasive. Results indicate that plastic deformation makes positive effect on impact-abrasion resistance at primary stage of impact-abrasion. However, when number of impacts reaches around 7000, lattice relationship of M7C3 and martensite begins to fail, making internal cracks regenerated. Then regenerated cracks propagate to M7C3's surface, reducing impact-abrasion resistance. With further cycling, cracks continue propagating into martensite from M7C3's surface, resulting in impact-abrasion resistance failure.