Production of Fe-P-C amorphous wires by in-rotating-water spinning method and mechanical properties of the wires

Abstract

Continuous amorphous wires with high strength and good ductility have been produced in the Fe-P-C alloy system by the in-rotating-water spinning technique; however, no amorphous wires are formed, using the same technique, in the Fe-P-B, Fe-P-Si and Fe-B-C systems. The Fe-P-C amorphous wires have a circular cross-section, smooth peripheral surface, and diameters in the range of about 80 to 230μm. Their tensile strength,σ _f, and Vickers hardness,H _v, increase with increasing phosphorus and/or carbon content and reach 3000 MPa and 895 DPN for Fe₇₅P₁₀C₁₅. Fracture elongation,ε _f, including elastic elongation is about 2.8%. Cold-drawing to an appropriate reduction in area causes an increase inσ _f andε _f of about 3.7 and 79%, respectively. This increase is interpreted to result from an interaction between crossing deformation bands introduced by cold-drawing and the increase in the uniformity of shape for the drawn wires. Further, the undrawn and drawn amorphous wires are so ductile that no cracks are observed even after a sharp bending test. Thus, the Fe-P-C amorphous wires are attractive for fine-gauge high-strength materials both because of the uniform shape of the wires and because of their superior mechanical qualities.