We have studied the transformation of carbides in AISI M42 high-speed steels in the temperature window used for forging. The annealing was found to result in the partial transformation of the large, metastable M2C carbides into small, more stable grains of M6C, with an associated change in the crystal orientation. In addition, MC carbides form during the transformation of M2C to M6C. From the h...

Sintering behavior with and without external stress was investigated using undoped and doped (1500 ppm yttria) sub-micron a-alumina powders. The yttria doped alumina showed anomalous behavior with grain size around 0.9 pm, a second peak in densification rate during free sintering and a stagnation followed by a steep increase in flow stress during sinter forging. These were thought to correspond...

TA15 Ti-alloy is widely used to form key load-bearing components in the aerospace field, where excellent service performance is needed. Near-β forging technology provides an attractive way to form these complicated Ti-alloy components but subsequent heat treatment has a great impact on the final microstructure and mechanical properties. Therefore evaluation and determination of the heat treatme...

Gradient variations of through-thickness residual stress, microstructure and texture greatly affect the performance cold radial forged tubes. In this work, distribution stress was measured based on Debye ring. The characterized with electron backscattering diffraction technique. by X-ray diffractometer. influence strength anisotropy tubes different thickness reductions analyzed. results show th...

Abstract Composite components combine the benefits of different materials, leading to improved product properties, enhanced resource- and energy efficiency widening spectrum. Draw-forging is unique combination deep-drawing cold forging, where a core material encapsulated within thin sheet metal blank. Previously, basic draw-forging process only allowed covering shaft tip, covered length was lim...

The retention of nanocrystallinity in dense ceramic materials is still a challenge, even with the application of external pressure during sintering. The compaction behavior of high purity and acetate enriched zinc oxide (ZnO) nano-powders was investigated. It was found that acetate in combination with water plays a key role during the compaction into green bodies at moderate temperatures. Appli...

The presence of the eutectic phase (delta ferrite + M23C6) in martensitic stainless steels brings significant deterioration in-service mechanical properties critical components such as turbine shaft made these alloys. In present study, thermodynamic and kinetics formation during solidification reheating stages before forging a large size X38CrMo16 steel ingot are investigated. Material characte...