Influence of Heat Treatment of High-Speed Steel on its Microstructure, Hardness and Fracture Toughness

2013 ◽  
Vol 592-593 ◽  
pp. 680-683
Author(s):  
Franjo Cajner ◽  
Vojteh Leskovšek ◽  
Dragan Pustaić
Keyword(s):  
Fracture Toughness ◽  
High Speed ◽  
Volume Fraction ◽  
High Speed Steel ◽  
Experimental Investigations ◽  
Eutectic Carbides ◽  
Microstructural Parameters ◽  
Heat Treated ◽  
The Matrix ◽  
Steel Aisi

The correlation between fracture toughness, hardness and microstructure of vacuum heat-treated high-speed steel AISI M2 was investigated. Our intention was to investigate the influence of microstructural parameters such as the volume fraction of undissolved eutectic carbides, their mean diameter, the mean distance between the carbides, as well as the volume fraction of retained austenite in the matrix, on the above mentioned mechanical and fracture properties. The experimental investigations were performed on the high-speed steel. This steel had the following chemical composition (mass content in %): 0.89% C, 0.20% Si, 0.26% Mn, 0.027% P, 0.001% S, 3.91% Cr, 4.74% Mo, 1.74% V and 6.10% W.

Mechanical Analysis of Low and High Chromium Steels Used in Hot Strip Work Rolls

2018 ◽  
Vol 279 ◽  
pp. 3-9
Author(s):  
Fethi Benkhenafou ◽  
Ines Fernández Pariente ◽  
F.Javier Belzunce ◽  
Abdelkader Ziadi ◽  
Ming Quan Shi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
High Speed ◽  
Volume Fraction ◽  
Research Work ◽  
High Speed Steel ◽  
Nodular Cast Iron ◽  
High Chromium ◽  
Eutectic Carbides ◽  
Hot Strip ◽  
Conventional Heat Treatment

Microstructure, hardness and fracture toughness of low and high chromium high speed steel used in hot strip mills and subjected to conventional heat treatment have been examined. The influence of tempering temperatures on the mechanical properties of these products, determined using tensile and fracture toughness tests, was studied in this research work. The developed microstructures have been characterized by XRD, optical microscopy and SEM examinations. Macrohardness and microhardness of the specimens have been evaluated by Vickers indentation technique. The fracture toughness of these products was investigated using the rupture weight on 3 points bending specimens. The plane strain fracture toughness KIc and the fracture strength were measured for each alloy. The shell is high harness high speed steels, and the core is nodular cast iron. It was found that most fracture occurred in the eutectic carbides formed by the high content alloy element, such as Mo,V,Cr, but that for the alloys with a reduced volume fraction of eutectic carbides, a small amount of crack propagation occurred in the austenitic dendrites.

scholarly journals Influence of Vacuum Heat Treatments on Microstructure and Mechanical Properties of M35 High Speed Steel

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 643
Author(s):  
Chiara Soffritti ◽  
Annalisa Fortini ◽  
Ramona Sola ◽  
Elettra Fabbri ◽  
Mattia Merlin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Vickers Hardness ◽  
High Speed ◽  
High Speed Steel ◽  
Plane Strain Fracture Toughness ◽  
Secondary Carbides ◽  
Heat Treated ◽  
Strain Fracture

Towards the end of the last century, vacuum heat treatment of high speed steels was increasingly used in the fabrication of precision cutting tools. This study investigates the influence of vacuum heat treatments at different pressures of quenching gas on the microstructure and mechanical properties of taps made of M35 high speed steel. Taps were characterized by optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, apparent grain size and Vickers hardness measurements, and scratch tests. Failure analysis after tapping tests was also performed to determine the main fracture mechanisms. For all taps, the results showed that microstructures and the values of characteristics of secondary carbides, retained austenite, apparent grain size and Vickers hardness were comparable to previously reported ones for vacuum heat treated high speed steels. For taps vacuum heat treated at six bar, the highest plane strain fracture toughness was due to a higher content of finer small secondary carbides. In contrast, the lowest plane strain fracture toughness of taps vacuum heat treated at eight bar may be due to an excessive amount of finer small secondary carbides, which may provide a preferential path for crack propagation. Finally, the predominant fracture mechanism of taps was quasi-cleavage.

An EM study of carbides in double austenitized AISI M2 high-speed steel

1990 ◽  
Vol 48 (4) ◽  
pp. 908-909
Author(s):  
Bilgehan Ögel ◽  
Erdoĝan Tekin
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
X Ray ◽  
Heat Treated ◽  
Conventional Heat Treatment ◽  
Fine Carbide ◽  
The Matrix ◽  
Carbide Distribution ◽  
M2 High Speed Steel ◽  
Diamond Paste

Multiple austenitization is not a conventional heat treatment process in tool steel industry and has only recently attracted some attention. Several workers who studied multiple austenitized high speed steels reported a fine carbide precipitation in the matrix of double austenitized specimens. However, the metallography of this precipitation is not well documented and needs further investigation. In this study, the microstructure of AISI M2 high speed steel and the effect of double austenitization on carbide distribution is investigated using SEM.The heat treated specimens were prepared by conventional metallographic methods for SEM examination. Polishing with diamond paste gave better results as much less carbides were extracted from their sites. Picral was used as an etchant.It is known that in M2 steels, undissolved carbides are either M6C or MC type. However, in the present investigation some of the massive undissolved M6C carbides contained small dark regions within them (Fig.l). X-ray mapping for W, Mo and V of such a carbide has shown that it is mainly a M6C carbide,whereas the dark regions on it is rich in vanadium implying that these regions represent V4C3 (Fig.2).

SUPER PANTHER

Alloy Digest ◽  
1963 ◽  
Vol 12 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
Heavy Duty ◽  
Cast Irons ◽  
Heat Treated

Abstract Super Panther is a cobalt type high-speed steel recommended for heavy duty cutting of hard, gritty, cast irons and heat treated steels. This datasheet provides information on composition, physical properties, and hardness as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-137. Producer or source: Allegheny Ludlum Corporation.

ELECTRITE ULTRA COBALT

Alloy Digest ◽  
1954 ◽  
Vol 3 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
Frictional Heat ◽  
Steel Company ◽  
Heat Treated ◽  
High Production ◽  
Red Hardness

Abstract Electrite Ultra Cobalt is a T-6 type high cobalt high-speed steel especially suited for high production machining of heat treated parts where excessive frictional heat necessitates maximum red hardness and wear resisting qualities. This datasheet provides information on composition and hardness as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-27. Producer or source: Latrobe Steel Company.

Diffusion Induced Changes in Eutectic Carbides in Wrought M2 High-Speed Steel at Austenitising

2015 ◽  
Vol 365 ◽  
pp. 5-10 ◽  
Author(s):  
Alexander S. Chaus ◽  
Matej Beznák ◽  
Miroslav Sahul
Keyword(s):  
High Speed ◽  
Diffusion Processes ◽  
Volume Fraction ◽  
High Speed Steel ◽  
Heat Treatments ◽  
Austenite Grain Size ◽  
Eutectic Carbides ◽  
M2 High Speed Steel ◽  
Primary Focus ◽  
Primary Carbides

The influence of heat treatments on the microstructure of AISI M2 type high-speed steel obtained using conventional metallurgy has been studied. The primary focus was on the effects of austenitisation temperatures on the behaviour of the initial eutectic carbides during austenitisation. In order to investigate kinetics of both the microstructure and phase transformations in eutectic carbides upon heat treatments with respect to diffusion processes, different techniques of electron scanning microscopy and energy dispersive X-ray spectrometry have been used. The effect of the austenitisation temperature on the primary austenite grain size, martensite microstructure and volume fraction, size distribution, and morphology of the primary carbides of eutectic origin as well as their behaviour during heat treatment in the wrought M2 high-speed steel was thoroughly investigated.

The Effects of RE-Mg on Thermal Fatigue Resistance of Cast High Speed Steel (HSS) Rolls

2005 ◽  
Vol 475-479 ◽  
pp. 217-220 ◽  
Author(s):  
Han Guang Fu ◽  
Zhi Qiang Jiang ◽  
Jian Dong Xing ◽  
Yan Xiang Li
Keyword(s):  
Fatigue Crack ◽  
Thermal Fatigue ◽  
High Speed ◽  
Fatigue Crack Initiation ◽  
High Speed Steel ◽  
Propagation Rate ◽  
Thermal Fatigue Crack ◽  
Eutectic Carbides ◽  
Carbide Morphology ◽  
The Matrix

The influence of rare earths(RE) and Mg compound modification on eutectic carbide morphology and matrix of high speed steel(HSS) roll was investigated. The results show that the matrix can be refined by the RE-Mg compound modifier, the eutectic carbides are inclined to turn into small lump, whose distribution is homogeneous. After modification, the heat conductivity coefficient of HSS is increased and heat expansion coefficient is decreased. Moreover, RE-Mg modification is able to increase the cycles of thermal fatigue crack initiation and decrease the propagation rate. After cycling 700 times at the condition of heating at 600oC and cooling in 25oC water, the length of thermal fatigue crack is lessened by 41.12%.

PANTHER SPECIAL

Alloy Digest ◽  
1966 ◽  
Vol 15 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Cast Iron ◽  
Physical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
Heavy Duty ◽  
Heat Treated ◽  
Alloy Steels

Abstract Panther Special is a cobalt high-speed steel recommended for heavy duty cutting of hard, gritty materials, such as cast iron as well as heat treated alloy steels. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-180. Producer or source: Allegheny Ludlum Corporation.

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