YANG Ruicheng, Chen Kui, WANG Kaixuan, et al. FRACTURE BEHAVIORS AND CHARACTERISTICS OFWC/ NiCrMo STEEL MATRIX COMPOSITES[J]. Acta Materiae Compositae Sinica, 2005, 22(3): 130-134.
Citation: YANG Ruicheng, Chen Kui, WANG Kaixuan, et al. FRACTURE BEHAVIORS AND CHARACTERISTICS OFWC/ NiCrMo STEEL MATRIX COMPOSITES[J]. Acta Materiae Compositae Sinica, 2005, 22(3): 130-134.

FRACTURE BEHAVIORS AND CHARACTERISTICS OFWC/ NiCrMo STEEL MATRIX COMPOSITES

  • Received Date: 2004-07-05
  • Rev Recd Date: 2004-12-29
  • Publish Date: 2005-06-15
  • The f racture behaviors and f ractographic features of WC/ NiCrMo steel mat rix composites under 12kinds of conditions, af ter austenization between 960 ~ 1040 ℃ then quenching and tempering, were investigatedusing single edge notched beam ( SENB) method, SEM and elect ron theory analysis. The result s show that thematerial has high st rength (σbb ~2200 MPa, σbc ~3000 MPa) and hardness ( HRC 62~68), and higher fracturetoughness (~30 MPa ·m1/2 ) . The main fractographic appearances are WC cleavage, quasi-cleavage of mat rix, dispersed dimples and dimple bands. The numerous hard phases of WC (~40 %) play a dominant role in f racture toughness and fracture behavior, and based on the alloy elect ron theory, both of the containing carbon st ructure unit swith high bond st rength andα-Fe (Ni) st ructure unit s with more lattice elect ron in mat rix cont ribute to the st rongtough support to the hard phases and lead to micro-ductility during fracture.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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