Effect of preliminary heat treatment on the structure and properties of AMS 6308 wear-resistant plate
AMS6308 steel is a heat-resistant wear-resistant plate developed by Carpenter Technology Corporation in the United States. The commercial brand is Pyrowear Alloy53. It belongs to the second generation of aviation wear-resistant plates. It is usually used to manufacture aviation gears and connectors that serve at a certain temperature. It has excellent comprehensive properties. mechanical properties. During the production and trial production of this steel, it was found that defects such as coarse grains and uneven structures would occur when the amount of deformation was insufficient, and when the AMS6308 wear-resistant plate was forged at high temperatures, if the final forging temperature was not properly controlled, grain boundaries would easily precipitate. More coarse M6C carbides reduce the mechanical properties.
Scientific researchers used SEM, TEM and mechanical property testing to study the impact of preparatory heat treatment on the structure and performance of AMS6308 wear-resistant plate. The results show that when normalized below 980°C, as the temperature increases, M6C carbides gradually dissolve and the grains become fine. After quenching, the martensite laths are uniform and fine, and the carbides are spherical or ellipsoidally dispersed at lath boundaries and grain boundaries. On the boundary, the carbide volume fraction and dislocation density are higher, and the strength and impact value gradually increase. When normalized above 980°C, M6C carbides dissolve more and the grains begin to grow. After quenching, the size of the martensite lath bundles also grows, the carbide volume fraction and dislocation density decrease, and the strength and impact value decrease.
Recommended preliminary heat treatment system: normalizing temperature is 980~1010℃, tempering temperature is 680~700℃. After performance heat treatment, AMS6308 wear-resistant plate shows good strength and toughness matching.
