As the alloy steel wire is a soft line, the specimen fracture are tough fracture, and produce different degrees of necking, the end is generally dark gray, the lack of bright metallic luster.
1. Cup-conical and half-cup-conical. One end of the middle of the flat wire to form the bottom of the cup around the formation of high from the wall, the other end was tapered. Samples forming a conical section of the cup generally have good plasticity. This is due to the pull force overload.
2. star-shaped cross-section. Star-shaped and cup-like cone-shaped cross-section approximation, but the cup wall is shorter and thinner, flat bottom part of the cup from the center to the circumference of radiation, such as ray-like lines. Samples having such cross-sections generally have high strength and ductility.
3. oblique angle section. This cross-section was about 45 ° at both ends of the bevel, generally indicating that the sample plastic poor, and sometimes with more serious dendritic tissue. In the drawing process, due to kink, wear caused by the role of shear stress fracture.
4. layered or wood-like fracture. Laminar or woody fractures are generally found on transverse specimens, indicating that the specimen has severe microscopic segregation and banding, or bubbles that are elongated in the machine direction, are loosened, or are present in a string of inclusions.
5. irregular-shaped fracture. Irregular shape of the fracture, said the sample has overheated, severe loose, inclusions, dendrites or longitudinal cracks and other defects, indicating that the quality of the sample itself is poor. Sometimes from the fracture can also be found in the sample within the crack and large inclusions and other serious defects.
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