title: ÐÐ»Ð¸ÑÐ½Ð¸Ðµ ÑÐµÐ¶Ð¸Ð¼Ð¾Ð² Ð¾Ñ Ð»Ð°Ð¶Ð´ÐµÐ½Ð¸Ñ Ð½Ð° ÑÐºÐ»Ð¾Ð½Ð½Ð¾ÑÑÑ ÑÑÐ°Ð»ÐµÐ¹ Ðº Ð¾ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ Ñ ÑÑÐ¿ÐºÐ¾ÑÑÐ¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Influence of cooling regimes on the susceptibility of steels to temper embrittlement
Creators: name: ÐÐ°Ð¿Ð¸ÑÐ°Ð½Ð¾Ð²Ð°, ÐÐ»ÐµÐºÑÐ°Ð½Ð´ÑÐ°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: Ð¡ÑÐ°Ð»Ñ
Ð¿Ð¾Ð½Ð¸Ð¶ÐµÐ½Ð¸Ðµ ÑÐ´Ð°ÑÐ½Ð¾Ð¹ Ð²ÑÐ·ÐºÐ¾ÑÑÐ¸
decrease in impact toughness

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description: The given work is devoted to studying the influence of various cooling regimes on the reversible temper embrittlement on the examples of steels grades 26HN3M2FA and 5HNM, as well as the study of the influence of copper on the mechanical properties of steel and the manifestation of the tendency to temper embrittlement on the example of steel 18H2N4MA. The research set the following goals: 1. Conduct heat treatment (tempering) with various cooling modes of metal from steel grades: 26XH3M2FA, 5XHM, 18X2H4MA; 2. Perform impact bending and tensile tests of the samples; 3. Compare the mechanical properties of the samples and determine the optimal cooling mode to prevent reversible temper brittleness and achieve the required steel properties; 4. Conduct a metallographic analysis to study the microstructure of the investigated steels; 5. Conduct a fractographic analysis of samples from 26XH3M2FA and 5XHM steel grades to study the nature of the fracture and assess the tendency to embrittlement; 6. Determine the optimal combination of tempering, which reduces the tendency to temper brittleness for 26XH3M2FA and 5XHM steel grades; 7. Determine the influence of copper on the tendency of 18X2H4MA steel to reversible temper brittleness. The work was fulfilled on the premises of NRC "Kurchatov Institute" -CRISM KM "Prometey", which included collection of factual materials: the results of metallographic and fractographic analysis of samples cooled according to various regimes, as well as the results of mechanical tests. Graphs of the impact toughness values depending on the impact test temperatures were constructed, clearly showing how the variation in cooling regimes and the copper content in the steel affect the impact toughness value. As a result, the microstructures, fracture surfaces of the samples, and graphs of the dependence of impact toughness on test temperatures were analyzed. Based on the research carried out at the NRC "Kurchatov Institute" - CRISM "Prometey, using the 18H2N4MA steel grade as an example, it was found that an increase in the copper content in the composition increases the susceptibility of the steel to reversible temper embrittlement. In the specimens made of 26HN3M2FA and 5HNM steel grades, the influence of the cooling method after heat treatment was studied in detail, and it was established that the considered cooling methods in the investigated alloy compositions of steels do not affect the temper embrittlemen.