M. V. Maisuradze, A. A. Kuklina, V. V. Nazarova, M. A. Ryzhkov, E. V. Antakov
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引用次数: 0
Abstract
Low-carbon Cr-Ni-Mo steels widely used in mechanical engineering are studied: 18Kh2N4MA, 25Kh2N4MA, 25KhN3MA. Thermokinetic diagrams are plotted by a dilatometric method. Temperature-time ranges for microstructure constituent formation are established. It is shown that bainite within the steels studied may be formed both above and below the Ms temperature. Features of isothermal bainite transformation are investigated, kinetics of bainite transformation are determined, as well as the quantitative ratio of microstructure constituents formed as a result of austempering. It is established that the largest amount of bainite within the steel structures studied (80–95%) is achieved at a temperature near Ms. Mechanical properties (strength, ductility, impact strength) of the steels being studied are analyzed after various heat treatment methods: various cooling intensities, upper and lower bainite austempering. It is shown that formation of upper bainite has an ambiguous effect on steel impact strength.
研究了机械工程中广泛使用的低碳铬镍钼钢：18Kh2N4MA、25Kh2N4MA、25KhN3MA。采用稀释法绘制了热动力学图。确定了微观结构成分形成的温度-时间范围。结果表明，在所研究的钢材中，贝氏体可在高于和低于 Ms 温度的条件下形成。研究了贝氏体等温转变的特征，确定了贝氏体转变的动力学以及奥氏体回火形成的微观结构成分的定量比率。在采用各种热处理方法（各种冷却强度、上贝氏体奥氏体化和下贝氏体奥氏体化）后，对所研究钢材的机械性能（强度、延展性、冲击强度）进行了分析。结果表明，上贝氏体的形成对钢材冲击强度的影响并不明显。
期刊介绍：
Metallurgist is the leading Russian journal in metallurgy. Publication started in 1956.
Basic topics covered include:
State of the art and development of enterprises in ferrous and nonferrous metallurgy and mining;
Metallurgy of ferrous, nonferrous, rare, and precious metals; Metallurgical equipment;
Automation and control;
Protection of labor;
Protection of the environment;
Resources and energy saving;
Quality and certification;
History of metallurgy;
Inventions (patents).
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