Hydrogen effect on the high-nickel surface steel properties during machining and wear with lubricants

Abstract

Purpose: The aim of the proposed research is to investigate the hydrogen effect on the high-nickel steel surface properties changing during machining and wear with participation of lubricant-cooling environments. Design/methodology/approach: The approach of the fracture mechanics and physicalchemical methods surface properties investigation was used to formulate the conclusions. Applying of lubricant-cooling (liquid, solid, gaseous) technological environments (LCTE) has change the morphology of chips and roughness of contact 23Ni1Mo3Ti steel surfaces depending on the experimentally fixed hydrogen concentrations (4.62…12.0 ppm). It correlates with both the roughness of the treated surface and the nature of the cutting products fragmentation: the maximum concentration of hydrogen - in the chips coincides with the minimum size of its defragmentation and reduction of the surface roughness. For nitrogen and oxygen, a similar relationship is traced poorly. Findings: On the basis of the fracture mechanics approaches it is confirmed, that in the conditions of the application of hydrogen containing (as chemical composition) (up to 12 ppm) and hydrogen accumulated (in nano container) (up to 600 ppm) LCTE, hydrogen enters the near crack initiation contact zone before fracture and taking part in changing structural material fracture mechanisms, improves its mashinning processes. Research limitations/implications: The results obtained on laboratory specimens should be tested during machining of real details made from high-nickel steel. Practical implications: The created technological approaches can be used in practice evaluation of mechanical properties and residual of modern gas turbine parts. Originality/value: It was shown, that hydrogen containing (in chemical composition) and hydrogen accumulated (in nano container) LCTE permits the hydrogen to enter in the near crack initiation contact zone before fracture and taking part in changing structural material fracture mechanisms.

Properties of nickel-based superalloys of equiaxial crystallization

“…(calibration factor 5 was determined empirically) for evaluating the mechanical properties, which takes into account the complex effect of the main components of the alloy. Since the dimensional mismatch of the lattice parameters is associated with the degree of concentration solid solution hardening of the γ-and γ′-phases, the efficiency of precipitation hardening of the alloy, the creep rate, and other properties, the Kγ′ ratio allows us to associate these properties with multicomponent systems [1][2][3][4][5][6][7][8][9][10].…”

“…The development of new and optimization of existing alloys for cast parts, namely, the most heavily loaded, such as the working and nozzle blades of a gas turbine engine, is a material science, design and technological task that requires a comprehensive solution [1][2][3][4]. For modern thermally stressed gas turbine engines, the above-mentioned complex-profile parts are made from multicomponent heat-resistant alloys based on nickel, cobalt and iron by the methods of equiaxed, directional or monocrystalline casting [5][6][7][8][9].…”

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

“…However, none of the works mention how to avoid sediment on the bottom of the engine cooling channel of "light" nanoparticles under the action of inertial and gravitational forces. The main questions addressed in the article are the following: factors influencing the thermal conductivity coefficient of nanofluids (including very high value in pure hydrogen or hydrogen containing); boiling of liquid in the cooling jacket of the engine cylinder head; behavior of nanoparticles and devices with nanoparticles in the engine cylinder head cooling system; the discussion of the results , taking into account degradation of modern structural materials under the hydrogen containing environment influence [2,24,32,[43][44][45][46][47][48][49][50][51]63,118,175,176].…”

Wear Resistance of Spark Ignition Engine Piston Rings in Hydrogen-Containing Environments

“…This process contributes to intensive wear [2][3][4][5][6][7][8][9][10]. Authors [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have analyzed the features of hydrogen wear of construction machine parts.…”

“…The ways of surface hydrogenation are established, the mechanism of hydrogen wear of machine parts and equipment is discussed, and the methods of protection against tribohydrogen saturation are formulated [10]. On the other hand, the interaction of hydrogen with metals and non-metallic elements [19][20][21][22][23] and its influence on various properties of metals, alloys, hydrogen-induced specific defects, and hydrogen embrittlement, as well as the effect of hydrogen on the mechanical characteristics in the "hydrogen-metal" couple, are assessed [1,2,10].…”