The formation of precipitates during thermal processing of microalloyed steels greatly influences their mechanical properties. Precipitation behavior varies with steel composition and temperature history and can lead to beneficial grain refinement or detrimental transverse surface cracks. This work presents an efficient computational model of equilibrium precipitation of oxides, sulfides, nitri...

There is an urgent need for more durable and cost-effective bearing and gear steels for wind turbine applications; yet we are still using traditional steels such as 8620 and 52100 steels, which are inexpensive and have high strength. However, higher corrosion resistance is required for marine application of wind turbines. Our research group developed under NSF funding a series of high strength ...

In this study, some mechanical properties of borided and unborided four steels were investigated. Boronizing of steels was performed by powder pack method at 1210 K for 4 h. The hardness of borides, boride layer thickness and room temperature tensile properties were measured and it was observed that hardness and tensile properties strongly depend on chemical composition of steels. In addition, ...

The effect of the initial microstructure and intercritical annealing on mechanical properties and work-hardening response of a high-formability low carbon steel were studied. The work-hardening analysis was based on the modified Crussard–Jaoul method. The ferritic-pearlitic sheets showed low strength and high total elongation with the appearance of the yield point phenomenon. The occurrence of ...

In recent years, great attention has been paid to the development of high manganese austenitic TWIP steels exhibiting high tensile strength and exceptional total elongation. Due to low stacking fault energy (SFE), cross slip becomes more difficult in these steels and mechanical twinning is then the favored deformation mode besides dislocation gliding. Chemical composition along with processing ...

The evolution of the microstructure changes during hot deformation high-chromium content stainless steels (martensitic steels) is reviewed. microstructural taking place under high-temperature conditions and associated mechanical behaviors are presented. During continuous dynamic recrystallization (cDRX), new grains nucleate growth in materials with high stacking fault energies (SFE). On other h...

A computational approach to the optimization of fracture resistance of multiphase materials (here high speed steels) by varying their microstructure is presented. The main points of the optimization of steels are as folIows: (1) development and verification of the model: numerical simulation of crack initiation and growth in real microstructures of steels, (2) computational experiment: simulati...

The presented work is aimed at the evaluation of cold bending capacity high-borated austenitic stainless steel sheets. Due to their excellent neutron-absorbing capability, borated steels belong group tailor-made structural materials widely used for vertical storage baskets holding spent nuclear fuel assemblies in cooling pools dry or wet facilities. basket consists individual assembly cells. Ea...