0.4C-4.5Cr-2Mo-0.5W-0.5V Steel

0.4C-4.5Cr-2Mo-0.5W-0.5V Steel

Steel name: 0.4C-4.5Cr-2Mo-0.5W-0.5V
Diagram No.: 1985
Chemical composition in weight %: Base steel: 0.4% C, 4.5% Cr, 2% Mo, 0.5% W, 0.5% V
Steel group: Hot work tool steels
Properties: The purpose of this work has been to compare the effects of four elements on the secondary hardening response of a base steel, a 4.4 wt% chromium, 0.4 wt% carbon hot work die steel. This was done primarily to directly compare the effects of cobalt and silicon. Possible effects of aluminum and nickel additions on the tempering behavior of this base steel have also been investigated. The strong effects of aluminum additions on the tempering response of low alloy steels8) are similar to those exerted by silicon additions to the same steel, which suggests aluminum may also influence the precipitation of alloy carbides and enhance secondary hardening.
Applications: No data
Reference: Not shown in this demo version.

Heat Treatment
Hardening: See the diagrams.
Tempering: See the diagrams.
Diagram note: These alloys were melted using pure starting materials in a vacuum induction furnace and then cast in copper chill molds as 9 kg cylindrical ingots 6.4 cm in diameter. The ingots were upset and cross forged at 1 200°C to bars 7 cm wide and 1.75 cm thick. The forged bars were sand blasted and then homogenized at 1 200°C in vacuum for 24 h and then furnace cooled. Specimen blanks were cut from the homogenized bars after they had been softened by tempering at 650°C for 2 h. Specimen blanks 7 cm x 1.75 cm x 2.5 cm were austenitized for 1 h in an argon atmosphere in a vertical tube furnace and quenched in oil. Austenitizing temperatures of 1000°C, 1050°C, 1100°C and 1200°C were used. These blanks were then tempered for 1 h in neutral salt baths and then water quenched. The tempering temperatures used were 200°C, 300°C, 400°C, 500°C, 550°C, 600°C and 650°C. The Rockwell C scale (Rc) hardness values were taken from specimens cut from the tempered blanks using an abrasive saw run at a slow speed under conditions of flood cooling. The reported hardness values are the average of five hardness measurements.

Tempering Diagrams

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