Abstract
In this work, W-Fe-B ternary system alloy was prepared using W, FeB and Fe powders and the pressure-free sintering route. The phase transformation, thermodynamic behavior, microstructure and mechanical properties of alloy from 700 to 1500 ℃ are systematically investigated. After sintering, the microstructure of alloy was composed W2FeB2 hard phase and W-Fe binder phase. The formation of W2FeB2 phase during solid-state sintering occurred by the reactions of 2 W+ 2FeB = W2FeB2 +Fe and 2 W+ 2Fe2B = W2FeB2 + 3Fe. During liquid-phase sintering, two liquid phases appeared, which were sequentially generated by the reactions of γ-Fe + Fe2B + W2B = L1 and δ-Fe + L1 + W2FeB2 = L2, respectively. The alloy exhibited excellent comprehensive mechanical properties with hardness of 438.9HV and compressive strength of 702 MPa at 1300 ℃ sintering. In summary, these findings looked promising for future preparation and application of high-performance W-Fe-B system hard alloy.
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