Effect of Boron Additions on the Microstructural Evolution and Properties of Fe-Mo-Cu-Ni-C Sintered Steel

Author:

Liu Zenglin1,Wang Yankang2,Yuan Yong2,Luo Fenghua3ORCID,Wang Tao2,Han Wei1,Tan Liming3

Affiliation:

1. China Iron and Steel Research Institute Group, Beijing 100081, China

2. Shandong Luyin New Material Technology Co., Ltd., Jinan 271104, China

3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract

The effects of different boron (B) additions from 0 to 0.5 wt.% on the microstructure and properties of Fe-Mo-Cu-Ni-xB-C powder metallurgy (PM) steels were investigated in this work. The results indicated that the ferrite phase quantity decreased and disappeared, Ni/Cu became more homogeneous, and M2B phase formed, with the addition of B. The density and hardness of the sintered steels monotonously increased with increasing B content, whereas the tensile strength and impact toughness first increased and then decreased. The tensile strength of the steels reached a maximum value of 1097 MPa at a 0.2% B content, whereas the impact toughness reached a maximum value of 25.7 J/cm2 at a 0.1% B content and then sharply decreased when the B content exceeded 0.2%. Frictional wear experiments showed that the weight loss of the steels decreased with an increasing B content under low load conditions (100 N), and the lowest weight loss of 0.043 g occurred at a 0.2% B content. Under high load conditions (200 N), the 0.1% B content steel saw the lowest weight loss 0.075 g, exhibiting excellent wear resistance, but the abrasive resistance of the steels decreased with a further increase in the B content due to the germination of microcracks and large spalling caused by the high hardness and brittleness.

Funder

China Association for Science and Technology

Publisher

MDPI AG

Subject

General Materials Science

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