THE EFFECT OF DEEP CRYOGENIC TREATMENT ON THE HARDNESS AND WEAR RESISTANCE OF 1.3255 STEEL

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SAFARI M.; SHAFYEI A.; AMINI K.

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Journal: JOURNAL OF NEW MATERIALS Year:2015 | Volume:5 | Issue:4 (20) Page(s): 1-13

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Title

THE EFFECT OF DEEP CRYOGENIC TREATMENT ON THE HARDNESS AND WEAR RESISTANCE OF 1.3255 STEEL

Author(s)

SAFARI M. | SHAFYEI A. | AMINI K. | Issue Writer Certificate

Keywords

1.3255 TOOL STEELQ2

DEEP CRYOGENIC TREATMENTQ2

WEAR BEHAVIORQ2

HARDNESSQ2

Abstract

The martensitic transformation start and finish temperatures in steels are reduced by increasing the percentages of carbon and the alloying clements. Even in high-alloy steels with high carbon contents, the martensitic transformation finish temperatures may reach less than zero degrees Celsius. As a result, the retained austenite will exist in the steel structure after quenching to the environmental temperature. Retained austenite is a soft phase that reduces HARDNESS, wear resistance, and dimensional stability. Therefore, one of the important issues in heat treatment of steels is the reduction or elimination of the retained austenite. One of the methods of the reduction or elimination of the retained austenite is using cryogenic treatment. The 1.3255 TOOL STEEL with its high percentage of carbon and alloy elements is one of the tool steels whose martensite finish temperature is below the zero degree temperature. The use of DEEP CRYOGENIC TREATMENT is an important method to decrease the retained austenite in this steel. The DEEP CRYOGENIC TREATMENT was proceeded by austenitizing treatment in oil media and holding on different times (1, 24, and 48 hr.) at -196oC. The effect of DEEP CRYOGENIC TREATMENT on microstructure, HARDNESS, and wear resistance was studied by optical microscopy (OM), scanning electron microscopy (SEM), HARDNESS test, and the pin-on-disk wear test. The obtained results showed that DEEP CRYOGENIC TREATMENT causes an increase in HARDNESS and wear resistance levels of 6.3% and 48-60%, respectively, in holding duration times of 24 to 48 h. The increase of HARDNESS and wear resistance during DEEP CRYOGENIC TREATMENT was related to decrease of retained austenite value, very fine carbides precipitation, and high volume fraction of the carbides. The wear mechanism was determined by scanning electron microscopy in terms of adhesive wear.

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APA: Copy

SAFARI, M., SHAFYEI, A., & AMINI, K.. (2015). THE EFFECT OF DEEP CRYOGENIC TREATMENT ON THE HARDNESS AND WEAR RESISTANCE OF 1.3255 STEEL. JOURNAL OF NEW MATERIALS, 5(4 (20)), 1-13. SID. https://sid.ir/paper/170005/en

Vancouver: Copy

SAFARI M., SHAFYEI A., AMINI K.. THE EFFECT OF DEEP CRYOGENIC TREATMENT ON THE HARDNESS AND WEAR RESISTANCE OF 1.3255 STEEL. JOURNAL OF NEW MATERIALS[Internet]. 2015;5(4 (20)):1-13. Available from: https://sid.ir/paper/170005/en

IEEE: Copy

M. SAFARI, A. SHAFYEI, and K. AMINI, “THE EFFECT OF DEEP CRYOGENIC TREATMENT ON THE HARDNESS AND WEAR RESISTANCE OF 1.3255 STEEL,” JOURNAL OF NEW MATERIALS, vol. 5, no. 4 (20), pp. 1–13, 2015, [Online]. Available: https://sid.ir/paper/170005/en

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