Effects of Tempering Temperature on the Microstructure, Strength, and Toughness of Medium-Carbon Ti–Mo-Bearing Martensitic Steel

2022 ◽  
Author(s):  
Yuemeng Zhu ◽  
Qi Zhang ◽  
Qing Yuan ◽  
Jisheng Guan ◽  
Yuebiao Yang ◽  
...  
Keyword(s):  
Martensitic Steel ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Strength And Toughness

Preparation and Mechanical Properties of Ultra-Fine Grain Medium-Carbon Steel Based on Equal-Channel Angular Pressing

2015 ◽  
Vol 645-646 ◽  
pp. 427-434
Author(s):  
Jian Min Wang ◽  
Wen Tao Hou ◽  
Lin Lu
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Equal Channel Angular Pressing ◽  
Martensitic Steel ◽  
Medium Carbon Steel ◽  
Optimal Size ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Angular Pressing ◽  
Average Grain Size

A new technology of preparing submicron medium-carbon steel quickly using martensitic steel by equal-channel angular pressing is developed. The technology combines martensite phase transformation with severe plastic deformation. In this research, martensitic steel is heated to 923K quickly and held for appropriate time, then equal-channel angular pressing is implemented. Supersaturated ferrites of average grain size within 0.5μm are obtained by the interaction of dislocation intersection, dynamic recrystallization and strain-induced phase transformation. At the same time, strain-induced phase transformation leads to dispersive precipitation of supersaturated carbon particles in the form of carbide inside grains or in grain boundaries. The optimal size of ferrite grains and the optimal distribution of carbides are acquired by controlling tempering temperature and time. The results show that ultra-fine grained materials prepared by this technology possess superior thermal stability.

Neutron diffraction study of the kinetics of low-temperature martensite decomposition in medium-carbon steel

2021 ◽  
Vol 6 ◽  
pp. 83-87
Author(s):  
A. A. Alekseev ◽  
◽  
S. S. Goncharov ◽  
Keyword(s):  
Solid Solution ◽  
Carbon Steel ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Supersaturated Solid Solution ◽  
Medium Carbon Steel ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Temperature Decomposition ◽  
Two Stages

It is found that the low-temperature decomposition of martensite in quenched medium-carbon steel occurs in two stages. In the first stage, the rate of decomposition is higher than that in the subsequent stage. Application of the neutron diffraction method allows the identification of two stages of transformation in the first stage of martensite decomposition. It is shown that the first stage is associated predominantly with carbon segregation at dislocations, and the second, with the outdiffusion of carbon from the supersaturated solid solution with the formation of dispersed particles of metastable carbides. It is shown that the change in the concentration of carbon and, accordingly, the degree of tetragonal lattice of martensite at aging and low tempering occurs to a certain limit, independent of the cooling rate during quenching and tempering temperature. This is due to the establishment of a relative equilibrium between a supersaturated solid solution and fine particles of metastable iron carbide. It is found that the determining process, which leads to a change in the microhardness the low-temperature decomposition, is the out diffusion of carbon from the supersaturated solid solution.

Deformation, Mechanical Properties, and Fracture of Quenched and Tempered Carbon Steels

2015 ◽  
pp. 405-437
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Ductile Fracture ◽  
Carbon Steels ◽  
Low Carbon ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Low Carbon Steels ◽  
Deformation Properties ◽  
Medium Carbon Steels

Abstract Steels with martensitic and tempered martensitic microstructures, though sometimes perceived as brittle, exhibit plasticity and ductile fracture behavior under certain conditions. This chapter describes the alloying and tempering conditions that produce a ductile form of martensite in low-carbon steels. It also discusses the effect of tempering temperature on the mechanical behavior and deformation properties of medium-carbon steels.

Characterization of Hydrogen-Related Fracture Behavior in As-Quenched Low-Carbon Martensitic Steel and Tempered Medium-Carbon Martensitic Steel

2015 ◽  
Vol 46 (12) ◽  
pp. 5685-5696 ◽  
Author(s):  
Akinobu Shibata ◽  
Tamotsu Murata ◽  
Hiroshi Takahashi ◽  
Takahiro Matsuoka ◽  
Nobuhiro Tsuji
Keyword(s):  
Fracture Behavior ◽  
Martensitic Steel ◽  
Low Carbon ◽  
Medium Carbon ◽  
Carbon Martensitic Steel

LUCEFIN GROUP 42CrMo4 (1.7225), 42CrMoS4 (1.7227)

Alloy Digest ◽  
2020 ◽  
Vol 69 (3) ◽  
Keyword(s):  
Physical Properties ◽  
Carbon Content ◽  
Induction Hardening ◽  
High Strength ◽  
Medium Carbon ◽  
Large Size ◽  
Content Classification ◽  
Alloy Steels ◽  
Flame Hardening ◽  
Strength And Toughness

Abstract Lucefin Group 42CrMo4 and 42CrMoS4 are medium-carbon, 1% chromium-molybdenum, direct hardening, alloy steels that are also suitable for flame hardening, induction hardening, and nitriding. These steels are medium hardenability steels in the 0.40 to 0.42 mean carbon content classification. In general, they are used for medium and large size parts requiring high strength and toughness. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, machining, and joining. Filing Code: SA-861. Producer or source: Lucefin S.p.A.

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