Grain Size of Commercial High Speed Steel

Abstract

The heat treatment of high speed steel tools consists of austenitizing, quenching and tempering. The size of austenite grains formed during the hardening treatment is an important factor in the final microstructure of the steel, and it also affects properties such as wear resistance and toughness. This paper presents the austenite grain size, matrix composition and hardness of commercial AISI M2, AISI T15, VWM3C and Sinter 23 high speed steels that were austenitized and quenched from five distinct temperatures. This study shows that increase in quenching temperature results in grain growth of steels such as AISI M2 and VWM3C, obtained by the conventional method (cast to ingot and worked). The P/M Sinter 23 high speed steel showed a slight grain growth (about 10%). This effect was not observed in AISI T15 obtained by the powder metallurgy process.

Heat treatment of centrifugally cast high carbon high vanadium high speed steel mill roll

“…The dimension of the specimens was Ø6625 mm. The rotating speed of the disc was 60 rev min 21 . The sliding velocity of the samples was 4 mm s 21 , and the sliding distance was 16?4 m. The wear loss of the testpiece was measured after each cycle.…”

“…The rotating speed of the disc was 60 rev min 21 . The sliding velocity of the samples was 4 mm s 21 , and the sliding distance was 16?4 m. The wear loss of the testpiece was measured after each cycle. The results of the wear tests were the average of three samples.…”

“…13. During cooling, the rolls were rotated at 28-30 rev min 21 . The insulating material (1?2-1?5 mm thick) was coated on the surface of roll neck.…”

“…High speed steels have been relatively well including the hardening and tempering of commercial high speed tool steel. [17][18][19][20][21] The heat treatment process of high speed tool steel is mature and includes annealing (heat to 870-890uC, hold for 2-4 h, slow cool to 535uC, then furnace cool or cool in still air to room temperature), hardening (preheat: heat to 790-815uC and hold for 1 h; austenitise: heat to 1150-1220uC and hold for 1-2 h; quench: air or positive pressure quench to below 50uC, or salt or interrupted oil quench to 540uC, then air cool to below 50uC) and temper (two to four times at 540uC or higher, 2 h minimum each time).…”