Effect of partitioning process on friction and wear properties of 5CrMnNiMo ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2022.07.024

Abstract

Abstract: Wear properties of 5CrMnNiMo ultra-high strength steel were studied by means of friction and wear tester under load of 50 N, wear speed of 0.5 m/s and dry friction and wear condition. The effect of partitioning processes on its wear resistance was discussed by means of SEM, EDS, XRD and EBSD. The results show that when the partitioning time is short (isothermal partitioning for 5 min), the wear resistance is controlled by hardness and the wear rate is low. With the extension of partitioning time to 6 h (non-isothermal partitioning) and 24 h (isothermal partitioning), the hardness decreases from 800 HV0.2 to 460 HV0.2 and 390 HV0.2, and the wear rate increases slightly. The wear mechanism is changed from mainly abrasive wear+oxidation wear, supplemented by adhesive wear to mainly adhesive wear, supplemented by abrasive wear. The long-term partitioning promotes the increase of austenite content which brings stronger TRIP effect in the friction and wear process, which enhances the wear resistance.

Key words: partitioning process, ultra-high strength steel, hardness, friction and wear

CLC Number:

TG142.1

Suo Zhongyuan, Du Yang, Fu Liming, Shan Aidang. Effect of partitioning process on friction and wear properties of 5CrMnNiMo ultra-high strength steel[J]. Heat Treatment of Metals, 2022, 47(7): 134-137.

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