Cast irons with some kinds of cementite with different chromium and vanadium contents were character- ized. Fracture toughness was determined by using an indentation technique, along with microhardness and elastic mod...Cast irons with some kinds of cementite with different chromium and vanadium contents were character- ized. Fracture toughness was determined by using an indentation technique, along with microhardness and elastic modulus. The results show that at the load of 1 N, microhardness of the cementite with 5.1% Cr is 10.53 GPa, the microhardness for cementite with 9.2% Cr increased to 11.25 GPa and for cementite with 4.5% V the microhard- ness is 9.18 GPa. The cementite with 9.2% Cr presented the highest elastic modulus of 230.4 GPa and the cement- ire with 4% V presented the lowest value of 201.32 GPa. Cementite with 5.1% Cr presented higher fracture tough- ness than cementite with 9.2% Cr; however, cementite with 4.5% V presented the highest fracture toughness of 2.74 MPa ·m1/2 and the lowest brittleness index of 3.35 μm-1/2.展开更多
文摘Cast irons with some kinds of cementite with different chromium and vanadium contents were character- ized. Fracture toughness was determined by using an indentation technique, along with microhardness and elastic modulus. The results show that at the load of 1 N, microhardness of the cementite with 5.1% Cr is 10.53 GPa, the microhardness for cementite with 9.2% Cr increased to 11.25 GPa and for cementite with 4.5% V the microhard- ness is 9.18 GPa. The cementite with 9.2% Cr presented the highest elastic modulus of 230.4 GPa and the cement- ire with 4% V presented the lowest value of 201.32 GPa. Cementite with 5.1% Cr presented higher fracture tough- ness than cementite with 9.2% Cr; however, cementite with 4.5% V presented the highest fracture toughness of 2.74 MPa ·m1/2 and the lowest brittleness index of 3.35 μm-1/2.
