Effect of Solidification upon Features of Primary Carbides in Niobium-Titanium High-Speed Steels

2008 ◽  
Vol 45 (6) ◽  
pp. 259-270
Author(s):  
Janusz Richter
Keyword(s):  
High Speed ◽  
Niobium Titanium ◽  
Primary Carbides

Gigacycle Fatigue Response of PM versus Ingot Metallurgy Tool Steels

2011 ◽  
Vol 672 ◽  
pp. 23-30 ◽  
Author(s):  
Herbert Danninger ◽  
Christian Sohar ◽  
Christian Gierl Mayer ◽  
Agnieszka Betzwar-Kotas ◽  
Brigitte Weiss
Keyword(s):  
Tool Steel ◽  
High Speed ◽  
Cold Work ◽  
Ingot Metallurgy ◽  
Tool Steels ◽  
Endurance Strength ◽  
Steel Grades ◽  
Primary Carbides ◽  
Effect Of The Composition ◽  
Large Primary

In this work, the gigacycle fatigue response of several tool steel grades has been studied using an ultrasonic resonance testing device. It showed that both with ingot metallurgy (IM) and powder metallurgy (PM) tool steels, a true fatigue limit does not exist up to 10E10 cycles. PM steels resulted in significantly higher endurance strength levels than IM grades. However, there was virtually no effect of the composition and hardness of the materials, both for PM and IM grades cold work tool steels and high speed steels exhibiting virtually the same S-N curves. In the IM tool steel grades, crack initiation started at large primary carbides or carbide clusters, while in the PM grades, nonmetallic inclusions were the critical sites. In any case it is very important to avoid introducing residual stresses into the specimen surfaces during preparation, which would markedly shift the endurance strength levels.

scholarly journals Phase transformation refinement of coarse primary carbides in M2 high speed steel

2011 ◽  
Vol 21 (2) ◽  
pp. 180-186 ◽  
Author(s):  
Fu-sheng PAN ◽  
Wei-qing WANG ◽  
Ai-tao TANG ◽  
Li-zhi WU ◽  
Ting-ting LIU ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Speed ◽  
High Speed Steel ◽  
M2 High Speed Steel ◽  
Primary Carbides

The role of primary carbides in the wear of high speed steels

Wear ◽  
1986 ◽  
Vol 112 (3-4) ◽  
pp. 327-340 ◽  
Author(s):  
A.M. El-Rakayby ◽  
B. Mills
Keyword(s):  
High Speed ◽  
Primary Carbides

A New Low Alloy High Speed Power Hack Saw Blades

2005 ◽  
Vol 475-479 ◽  
pp. 3939-3942
Author(s):  
Yuan Gao ◽  
Jin Yong Xu ◽  
Yan Ping Liu ◽  
Zhi Yong He ◽  
Zhong Xu
Keyword(s):  
High Speed ◽  
Bulk Material ◽  
Low Cost ◽  
High Speed Steel ◽  
Low Alloy Steel ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Solid Diffusion ◽  
Primary Carbides ◽  
Plasma Surface Alloying

Plasma surface alloying for low alloy high speed power hack saw blades was introduced.The bulk material of the blade is made of low alloy steel, while the teeth of which possess a composition of high speed steel like as a result of surface modification by a plasma surface alloying process.It is a solid diffusion process eliminating method avoids the formation of coarse primary carbides which is a major problem encountered in the production of smelting high speed steel. As a result the carbides in the layer of high speed steel are fine and well-distributed.Therefore,it has not only well wear-resistance but also toughness. Besides, the blade also has the advantages of ease manufacturing and low cost.

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.

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