Improvement of die life in the hot forging of brass alloys is considered vital from both technical and economical points of view. In this research, pin-ondisc tests were carried out at a range of temperatures to evaluate the influence of plasma nitriding and duplex nitriding-physical vapour deposition (PVD), including TiN-TiAlN and TiN-TiAlN-CrAlN coatings, on the tribological properties of AIS...

In this paper, the high temperature deformation behaviour of 17-4PH steel was studied. A new forming optimization method proposed. The study will help guide obtainment high-precision and high-mechanical properties forging products in aerospace industry. hot compression test carried out on a Gleeble1500D machine (DUFFERS SCIENTFIC, Beijing, China). stress–strain at 1000 °C~1150 °C strain rate 0....

Salah satu suku cadang yang penting dalam kendaraan jenis tank adalah perangkat roda disebut bogie wheel. Boggie wheel merupakan bagian dari sistem terdiri track, arm, bracket dsb. Bogie terbuat material aluminium ditempa (forging). Saai ini proses pembuatan whell menggunakan baja dengan permesinan. Akibat pergantian tersebut maka bertambah bobotnya sebesar 4 ton. Hal berpengaruh pada manuver s...

Abstract—Powder metallurgy (P/M) is the only economic way to produce porous parts/products. P/M can produce near net shape parts hence reduces wastage of raw material and energy, avoids various machining operations. The most vital use of P/M is in production of metallic filters and self lubricating bush bearings and siding surfaces. The porosity of the part can be controlled by varying compacti...

North American lithic analysis often assigns biface preforms to discrete, successive stages defined in Callahan's influential study. Yet recent research questions the stage concept, emphasizing instead a continuous view of the reduction process. To compare stage and continuum approaches, their assumptions are tested in experimental replicas, including Callahan's, and empirical Paleoindian prefo...