Effect of Deep Cryogenic Heat Treatment on the Wear Behavior of Carburized DIN 1.7131 Grade Steel

doi:10.1007/s40195-015-0204-1

Abstract

Abstract:

The effects of the deep cryogenic heat treatment on the microstructural changes, wear resistance, and hardness of carburized DIN 1.7131 grade steel were investigated. Results show that cryogenic heat treatment reduced the retained austenite and increased the carbide amount. In addition, after the cryogenic heat treatment, carbide shows a more uniform distribution, as compared to the conventionally treated ones. It was also clarified that the hardness of the cryogenically treated samples was improved, but the relative improvement decreases with the distance as the surface increases. It has been shown that the wear resistance improves due to the cryogenic heat treatment, and the predominant wear mechanism is a combination of the adhesive and tribo-chemical wear.

Key words: DIN 1.7131 grade steel, Carburized steel, Hardness, Deep cryogenic heat treatment, Tribo-chemical wear

Kamran Amini, AliReza Araghi, Amin Akhbarizadeh. Effect of Deep Cryogenic Heat Treatment on the Wear Behavior of Carburized DIN 1.7131 Grade Steel[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(3): 348-353.

Figures/Tables 9

Fig. 1 Schematic diagram of heat treatment of the DCT samples

Fig. 2 XRD patterns of the DCT and CHT samples

Fig. 3 OM micrographs of the CHT a, DCT b samples

Fig. 4 SEM images of the CHT a, DCT b samples

Fig. 5 Variation of hardness in the DCT and CHT samples as a function of distance from the samples surface

Fig. 6 Variation of wear rate versus the sliding distance at the loads of 120 N a, 160 N b

Fig. 7 SEM images of the worn-out surfaces of DCT a, CHT b samples after 500 m sliding under the load of 120 N

Fig. 8 SEM images of the worn-out surfaces of the DCT samples after 1,000 m sliding under the loads of 160 N a, 120 N b

Fig. 9 SEM image of the worn-out surface of the DCT sample after 1,000 m sliding under 120 N load a, EDX results of points A b, B c in Fig. 9a

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