Determination of rational modes of softening heat treatment of flanges made of medium-carbon steels

The modes of high tempering are investigated, making it clear that at temperatures above 500 °C, a whole or partial replacement of lamellar perlite with granular is observed.

Studies on the Mechanical Properties of C45 Steel with Martensitic Structure after a High Tempering Process

This article describes the studies of the mechanical properties of the martensitic structure of C45 steel, obtained as a result of heat treatment by a corresponding cooling method. This steel was subjected to high tempering, within the temperature range of 500÷700o C (every 50o C) and for various exposure times, from 15 minutes to 23 hours. Moreover, martensitic steel was subjected to non-standard tests by quenching at a temperature of 850 oC for 20 minutes and then tempering it for 1 hour, within the temperature range of 50÷800o C (50o C). The resulting steel structure variants were subjected to strength tests, that is, to tensile and hardness tests and also to tests on the micro-structure. The results of these studies are presented and discussed, in detail, in terms of their practical application.

FEATURES OF STRUCTURE FORMATION IN THE JOINING ZONE OF COPPER-STEEL COMPOSITE COPPER M3 + STEEL 30CRMNSIA AFTER EXPLOSION WELDING AND THERMAL IMPROVEMENT

The results of optical and electron microscopic metallographic studies and energy-dispersive analysis of the structure and composition in the zone of connection of copper M3 with steel 30 CrMnSiA after explosion welding, subsequent quenching from a temperature of 880 ° C and high tempering at a temperature of 520 ° C are presented. The change in the distribution of hardness and chemical elements over the cross section of the bimetal, the formation of martensite in melts after quenching and its decomposition during high tempering are shown.

FEATURES OF DESTRUCTION OF NITRIDED SAMPLES OF 38H2MYuA AND 30H3MA STEELS

The article deals with the features of deformation and destruction of samples that have undergone chemical-thermal treatment, using the example of testing nitrided samples of steels 38H2MYuA and 30H3MA. It is established that the mechanical properties determined during the tensile testing of samples with a highly rigid brittle layer cannot serve as design characteristics when evaluating the bearing capacity of parts that have undergone chemical-thermal treatment. Testing of nitrided samples of 38H2MYuA and 30H3MA steels demonstrated a complex process of their deformation and destruction, and the test result showed that this steel treated to the «hardened + high tempering» mode sensitivity to the most dangerous concentration the crack is absent.

Dilatometric and Microstructural Study of Martensite Tempering in 4% Mn Steel

This paper presents the results of martensite tempering resistance in 4% Mn steel. The material was quenched and tempered at 350 °C for 15, 30, and 60 min. The analysis of the quenching and tempering was carried out using dilatometric and microstructural approaches. The phase composition was assessed using X-ray diffraction. The Ms temperature and tempering progress were simulated using JMatPro software. The dilatometric analysis revealed a small decrease in the relative change in length (RCL) during tempering. This decrease was connected to the precipitation kinetics of cementite within the martensite laths. The microstructure investigation using a scanning electron microscope showed a very small amount of carbides, even for the longest tempering time. This showed the high tempering resistance of the martensite in medium-Mn steels. The hardness results showed an insignificant decrease in the hardness depending on the tempering time, which confirmed the high tempering resistance of martensite.

CRYODUR 2990

Cryodur 2990 is a good choice for cutting and shearing tools. The alloy is a cold work steel with hardness, good toughness, and high-tempering resistance combined with high-wear resistance. This datasheet provides information on composition, physical properties, and hardness. It also includes information on high temperature performance and wear resistance. Filing Code: TS-757. Producer or source: Schmolz + Bickenbach.

EFFECTS OF AUSTENITIZATION ON STRUCTURE FORMATION СHROMO-MOLYBDENUM-VANADIUM STEEL AFTER HIGH TEMPERING

Influence of austenitization temperature of chrome-molybdenum-vanadium steel on structure formation at the softening heat treatment is studied. It is shown that the decline of the austenitization temperature promotes to reduce the micro-hardness values due to the intensification of spheroidizing of pearlite after the overcooling and high tempering. Increasing the austenitization temperature leads to formation of an uneven structure after tempering.