Study on tensile properties of 2A12 aluminum alloy drill pipe reinforced with SiC and carbon fiber

Abstract:

The total reserves of shallow and mid-shallow oil and gas resources in China are dwindling due to continuous exploitation. Enhancing exploration and development of deep and ultra-deep oil and gas resources is crucial for ensuring national energy security. Drilling in deep and ultra-deep high-temperature formations poses inevitable engineering challenges， necessitating the development of lightweight， high-strength， and temperature-resistant drill pipe materials. In this study， SiC particle-reinforced 2A12 aluminum alloy drill pipe materials， with short carbon fibers incorporated， were prepared through vacuum hot-pressing sintering， hot extrusion， and heat treatment processes. The mechanical properties of composites with varying SiC volume fractions were evaluated under different temperatures. Results indicate that the mechanical properties of SiC/2A12 aluminum alloy composites with a 3% SiC volume fraction at 25℃ are the best， and the tensile strength is 10.8% higher than that of 2A12； the mechanical properties of SiC/2A12 aluminum alloy/carbon fiber composites with a 5% volume fraction at 180℃ and 220℃ exhibit superior performance， with corresponding increases in tensile strength of 17.9% and 19.2%， respectively. The incorporation of SiC particles and carbon fibers increases the operational temperature of the 2A12 aluminum alloy by 40℃. The primary strengthening mechanisms are Orowan strengthening for SiC particles and load transfer for carbon fibers.