This paper presents a systematic procedure for the optimization of machining parameters such as cutting speed, feed rate, nose radius, edge radius, and rake angle to reduce specific material removal energy and improve energy efficiency in the hard turning of AISI 4140 steel. A simulation approach was applied in conjunction with the design of experiment (DOE), mathematical approximation with a m...

A finite element model coupled with a thermokinetic model is developed to predict the phase transformation of the laser deposition of AISI 4140 on a substrate with the same material. Four different deposition patterns, long-bead, short-bead, spiral-in, and spiral-out, are used to cover a similar area. Using a finite element model, the temperature history of the laser powder deposition (LPD) pro...

• A fatigue strength assessment procedure for steels with inclusions is proposed. Such a implements defect content analysis and the area -parameter model. The multiaxial critical plane-based criterion by Carpinteri at al. also implemented. return period optimisation , in terms of estimations, performed. An experimental campaign analysed to evaluate accuracy above procedure. In present paper, hi...

In this study, AISI 1040 and 4140 steels were boriding using Ekabor-II commercial powder with powder-pack method microwave conventional heating methods. The samples borided at 950 °C for 2 6 hours in an Ar atmosphere a oven of Enerzi-Mh2912-V8. Biphasic structure (FeB/Fe2B) was formed all hours. A single-phase observed steel Compared to the method, 1.5-1.6 times thicker boride layer obtained mi...