Laser alloying is an effective method to form functional surface layers (coatings) on metallic materials, particularly stainless steels. Unique phase balance, dislocation substructure, and a possibility obtain gradient microstructures after laser slow down the degradation increase wear resistance. In this work, optimal parameters of their effects microstructure properties were investigated for ...

To evaluate the effect of yield stress on hydrogen embrittlement (HE) martensitic and ferritic steels, (H) capture by structural inhomogeneities (hydrogen traps) plastic deformation mechanism corrosion cracking (SCC) are considered. In presence hydrogen, brittle fracture high-strength steels consists flat areas intergranular at initial austenitic grain boundaries quasi-brittle cracks martensite...

Paper presents the research of austenitic steel AISI 304after ion nitriding at 400◦C and at t =4h, for the two different variants of samples distribution in the working plasma reactive chamber tube. In order to assess the effectiveness of ion nitriding variants emission spectroscopy – GDOES, surface hardness tests, microstructure research (LM) of nitrided layers were made. It has been found tha...

The materials of the article consider analysis construction active zones new generation nuclear reactors. reflects general ideas about development reactor technologies: in 1950s and 1960s, first reactors was created; early 1970s, operation industrial began - second generation: pressurized water (WWER, PWR), boiling (RBMK, BWR), heavy (CANDU), as well gas-cooled (AGR). Further some types made it...

In ferrite/austenite dissimilar metal welds, carbon can diffuse from the ferritic low-alloy steel to austenitic weld during heat treatment and thermal aging due large chromium content differences between two alloys. This influx leads precipitation of carbides in high-alloy metal, near fusion boundary, which affect properties joint. was investigated using multiple characterization techniques: el...

The evolution from natural gas usage to new technologies, such as the use of hydrogen fuel or electricity‐based heating, strongly influences oxidation stainless steel surface in reheating furnace. Thermogravimetric tests using different simulated combustion and induction conditions were performed for austenitic AISI 301 304, ferritic 444 grades. Simulated furnace atmospheres methods based on me...

Evaluation of the low cycle fatigue life by the small specimen test technique (SSTT) and some other properties (metallographical structure and Vickers hardness) for the TIG (tungsten inert gas) weld of F82H IEA-heat were carried out. The TIG-weld was distinguished into seven regions with different metallographical structure and hardness, which were the base metal (BM) region (region with almost...

Original scientific paper Hot rolling of CuZn27Al4 shape memory alloy results in the forming of defects in austenitic crystals. The defects such as dislocation and deformed boundaries of austenitic grains affect both "classical" material properties and the specific properties related to shape memory. Rolled and quenched alloy (ausforming treatment) shows hardening proportional to the value of i...