Fine structure of low-carbon steel after electrolytic plasma treatment

Abstract

This work shows the results of research of the fine and dislocation structure of the transition layer of 18CrNi3Mo low-carbon steel after the influence of electrolytic plasma. Conducted research has shown that the modified steel layer, as a result of carbonitriding, was multiphase. Quantitative estimates were made for carbonitride М23(С,N)6 in various morphological components of α-martensite and on average by material in the transition layer of nitro-cemented steel. It was established that α-phase is tempered martensite after nitrocementation. Released martensite is represented by batch, or lath and lamellar low-temperature and high-temperature martensite. Inside the tempered martensitic crystals, lamellar cementite precipitates are simultaneously present, and residual austenite is found along the boundaries of the martensitic rails and plates of low-temperature martensite. It was determined that inside the crystals of all morphological components of α-martensite there are particles of carbonitride М23(С,N)6.

Evaluating the Residual Life of Long-Term Equipment Made of Structural and Heat-Resistant Steel By using Structural-Mechanical Criterion

“…The method of transmission electron microscopy (TEM) on foils was used to study the fine structure of metal in localized deformation zones using an EM-125 electron microscope (Sumy electronic devices plant, Ukraine) [27][28][29][30]. The studies were carried out at a working magnification in the microscope column of 25,000 times and an accelerating voltage of 125 kV.…”

Evaluating the Residual Life of Long-Term Equipment Made of Structural and Heat-Resistant Steel by Using the Structural–Mechanical Criterion

“…Digital image correlation (DIC) was carried out using a PL-B781F video (Pixelink, Ottawa, ON, Canada) with illumination of the working part with an SN 635-30-KB laser. The same experiments were carried out on similar samples obtaine pipes of the same dimensions that were not in operation (initial state) for compari Transmission electron microscopy (TEM) on foils was used to study the fine st of metal in localized deformation zones using an EM-125 electron microscope (Sum tronic devices plant, Sumy, Ukraine) [27][28][29][30]. The studies were carried out at a w magnification in the microscope column of 25,000 times and an accelerating voltag kV.…”

“…Transmission electron microscopy (TEM) on foils was used to study the fine structure of metal in localized deformation zones using an EM-125 electron microscope (Sumy electronic devices plant, Sumy, Ukraine) [27][28][29][30]. The studies were carried out at a working magnification in the microscope column of 25,000 times and an accelerating voltage of 125 kV.…”