The morphology of eutectic carbides in M2-grade high speed steel

1985 ◽  
Vol 16 (12) ◽  
pp. 2341-2342 ◽  
Author(s):  
M. R. Ghomashchi
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Eutectic Carbides

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.

A Study of the Carbides in High-Speed Steel Rolls

2010 ◽  
Vol 638-642 ◽  
pp. 3356-3361 ◽  
Author(s):  
Yi Kun Luan ◽  
Nan Nan Song ◽  
Xiu Hong Kang ◽  
Dian Zhong Li
Keyword(s):  
Heat Treatment ◽  
Grain Boundaries ◽  
High Speed ◽  
Solidification Rate ◽  
High Speed Steel ◽  
Eutectic Carbides ◽  
Complex Carbides ◽  
Steel Rolls ◽  
Alloy Concentration

Carbides in HSS roll were studied systematically. The results showed that there were two kinds of carbides in HSS roll, 1st and 2nd carbides. 1st eutectic carbides included the chrysanthemum-like MC mainly consisting of V and the plate-like M2C rich in Mo. 2nd carbides were complex carbides, concentrating Fe, Cr, Mo and V elements. The morphology, distribution and alloy concentration of the 1st eutectic carbides were studied using OM, SEM and EDS. During heat treatment, evolution of the 1st eutectic carbides was analyzed. It was found that the MC carbides had no change in morphology, components and distribution, while the M2C carbides decomposed to M6C and MC. In order to improve the properties of HSS, a method of increasing solidification rate was defined to refine the eutectic carbides. After refinement, the eutectic carbides distributed both along the grain boundaries and inside the grains.

Influence of rare earths on eutectic carbides in AISI M2 high speed steel

2012 ◽  
Vol 30 (10) ◽  
pp. 1075-1078 ◽  
Author(s):  
Xuefeng ZHOU ◽  
Xiaoyan YIN ◽  
Feng FANG ◽  
Jianqing JIANG ◽  
Wanglong ZHU
Keyword(s):  
Rare Earths ◽  
High Speed ◽  
High Speed Steel ◽  
Eutectic Carbides ◽  
M2 High Speed Steel

scholarly journals Non-equilibrium solidification and microsegregation in centrifugally cast high speed steel for rolls

2018 ◽  
Vol 54 (1) ◽  
pp. 59-66 ◽  
Author(s):  
U. Klancnik ◽  
B. Kosec ◽  
P. Mrvar ◽  
J. Medved
Keyword(s):  
Electron Microscopy ◽  
High Speed ◽  
Light And Electron Microscopy ◽  
High Speed Steel ◽  
Scanning Calorimetry ◽  
Centrifugally Cast ◽  
Eutectic Carbides ◽  
Thermo Calc Software ◽  
Equilibrium Solidification ◽  
Non Equilibrium

When regarding as-cast microstructures of highly alloyed metals, microsegregation of alloying elements is a common feature resulting from non-equilibrium conditions during solidification. The aim of this work is to predict the occurrence and severity of microsegregation in highly alloyed, centrifugally cast high speed steel used for rolls. The prediction was performed using thermodynamic Scheil-Gulliver modelling with Thermo-Calc software. The modelled predictions were then compared with differential scanning calorimetry, X-ray diffraction, light and electron microscopy with energy dispersive spectroscopy, all performed on an as-cast roll shell. Results show that chromium, molybdenum and vanadium have the highest tendency to microsegregation. Vanadium tends to form negative microsegregation, while molybdenum and chromium form positive microsegregation. Scanning electron microscopy revealed the presence of complex eutectic carbides, confirming the Scheil-Gulliver non-equilibrium solidification path via two main successive eutectic reactions.

Study on the Solidification Microstructure of Aluminum Alloyed High Speed Steel

2011 ◽  
Vol 217-218 ◽  
pp. 463-467 ◽  
Author(s):  
Xue Feng Zhou ◽  
Xiao Yan Yin ◽  
Feng Fang ◽  
Jian Qing Jiang
Keyword(s):  
Crystal Structure ◽  
High Speed ◽  
High Speed Steel ◽  
Interface Structure ◽  
Liquid Interface ◽  
Solidification Microstructure ◽  
Eutectic Carbides ◽  
M2 High Speed Steel ◽  
Solid Liquid Interface ◽  
Solid Liquid

The present work has investigated the effect of aluminum on the solidification microstructure of M2 high speed steel. The results show that the as-cast structure is refined and the networks of M2C eutectic carbides are distributed more homogeneously with the addition of aluminum. Meanwhile, the morphology of M2C changes from the fibrous shape to the plate-like one. Despite of the same crystal structure, the microstructure differs greatly between the two carbides. Compared with the fibrous M2C, micro-twining is formed in the plate-like M2C, resulting in the orientation changes between different plates. It is expected that the solid/liquid interface structure of M2C may evolve from the non-faceted into the faceted due to the addition of aluminum.

Thermocyclic regulation of the morphology and size distribution of eutectic carbides in high-speed steel

2010 ◽  
Vol 40 (7) ◽  
pp. 676-683
Author(s):  
S. A. Zinchenko ◽  
M. I. Makhnev ◽  
P. A. Shamshurin
Keyword(s):  
Size Distribution ◽  
High Speed ◽  
High Speed Steel ◽  
Eutectic Carbides

Effect of Austenitising Temperature on Microstructural Changes in High-Speed Steel of M2 Type Inoculated with Addition of WC Powder

2013 ◽  
Vol 333 ◽  
pp. 27-32 ◽  
Author(s):  
Alexander S. Chaus ◽  
Matej Beznák ◽  
Ján Porubský ◽  
J. Sojka
Keyword(s):  
Phase Transformations ◽  
High Speed ◽  
Diffusion Processes ◽  
High Speed Steel ◽  
Xrd Analysis ◽  
Solidification Microstructure ◽  
Eutectic Carbides ◽  
Electron Scanning Microscopy ◽  
Powder Addition ◽  
Kinetics Of

The transformation of the solidification microstructure in AISI M2 grade high-speed steel inoculated with powder addition of WC have been studied focusing on the effect of austenitisation. In order to investigate the kinetics of both the microstructure and phase transformations in eutectic carbides, primarily M2C carbide decomposition, upon heat treatments with respect to diffusion processes, electron scanning microscopy, XRD analysis and EDS have been used.

Optimization Decomposition Cast Structure in M35 High-Speed Steel

2013 ◽  
Vol 706-708 ◽  
pp. 167-171
Author(s):  
Peng Biao Han ◽  
Jian Zhang ◽  
Li Zhi Wu ◽  
Xiao Dong You
Keyword(s):  
Heat Treatment ◽  
Optical Microscopy ◽  
High Speed ◽  
Metastable Phase ◽  
High Speed Steel ◽  
Heat Treatments ◽  
Cast Structure ◽  
Cast Strip ◽  
Eutectic Carbides

The effects of the different heat-treatments on the eutectic carbides in HSS cast strip are studied. The microstructure of the high speed steel(HSS) is analysized by means of optical microscopy and SEM. The results show that the heat treatment can make M2C and M6C metastable phase decompose. After comparison we can find that the optimized heat treatment processing of HSS cast strip is at 1200°Cfor 6 h, under which the fine and uniform carbides can be obtained.

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.

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