The graph shows a continuous cooling test in which the austenitizing temperature was approximately 1040°C (1900°F).
Continue readingOne Minute Mentor: Secondary Hardening in Tool Steels
As shown schematically in the graph, high-temperature hardness is made possible only by a very important straightening mechanism: secondary hardening, promoted by the precipitation of fine alloy carbides.
Continue readingOne Minute Mentor: Heat Treating of Hot-Work Tool Steels
The ability of a given grade of hot-work tool steel to maintain hardness for a prolonged time at high temperatures is called tempering resistance.
Continue readingOne Minute Mentor: Relation Between Tempering Temperature and Hardness
The graphs show the relation between tempering temperature and hardness for D2 and D3 tool steels.
Continue readingOne Minute Mentor: Tool Steel Tempering Practices
Multiple tempering is effective in decreasing the amount of austenite retained in A and D steels and is a common practice in heat-treating them.
Continue readingOne Minute Mentor: Austenitizing Powder Metallurgy Steels
Steels of groups A and D as well as 8%Cr or High-V-PM steels are usually austenitized in vacuum furnaces or in various types of furnaces using gaseous atmospheres.
Continue readingOne Minute Mentor: Tempering F Tool Steels
Because of their tungsten content, F-steels form hard tungsten carbides.
Continue readingOne Minute Mentor: Austenitizing Tool Steel
Austenitizing is the heat treatment in which the final alloy element partitioning between the austenitic matrix (which will transform to martensite) and the retained carbides occurs.
Continue readingOne Minute Mentor: Sinter Hardening
Sinter hardening refers to a process in which the cooling rate in the cooling zone of the sintering furnace is fast enough to transform a significant portion of the powder metal steel matrix into martensite.
Continue readingOne Minute Mentor: Tempering Powder Metallurgy Steels
Usually, powder metallurgy steel parts having a density greater than 6.7 g/cm3 (0.242 lb/in.3) should be tempered after hardening. Recommended tempering temperatures for PM parts range from 150 to 200°C (300 to 390°F) with 175°C (350°F) being common.
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