Abstract
The purpose of this work was a study of the influence of heat treatment conditions of small diameter shafts of secondarily hardening steel on the hardened case depth in subsequent spiral surface laser hardening. Specimens with a diameter of 10 mm of Kh9VMFSh steel oil hardened from austenitizing temperatures of 980 and 1080/sup 0/C (60-61 HRC) were used. The study of the microstructure and measurements of the hardened case depth were made on polished specimens with a microscope. Microhardness across the depth of the hardened case was also measured. The laser heat treatment was done with a continuous CO/sub 2/ laser with a radiation power of 2 kW. The effective method for final heat treatment was determined to consist of oil hardening from austenitizing temperatures, surface laser hardening, and high-temperature tempering.
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