Effect of rare earth lanthanum on fatigue property of 300M steel

doi:10.13251/j.issn.0254-6051.2021.02.003

Abstract

Abstract: Effects of rare earth element La on the conventional mechanical properties and high cycle fatigue property of 300M steel and its modification effect on the morphology and size of nonmetallic inclusions in the steel were studied by mechanical property test, SEM analysis of fatigue fracture morphology and non-metallic inclusions at crack sources. The results show that, 0.006wt% lanthanum has little effect on the conventional mechanical properties, but significantly improves the high cycle fatigue property of the 300M steel, leading to that the high cycle fatigue limit σ_-1 of the 300M steel increases from 867 MPa to 940 MPa. The inclusions in the La-modified steel become larger in size, and change to rare earth inclusions containing S and O. The hardness, elastic modulus and expansion coefficient of the inclusions are closer to that of the steel matrix, which can effectively reduce the stress concentration around the inclusions and improve the high cycle fatigue properties of the steel.

Key words: 300M steel, lanthanum, fatigue crack source, non-metallic inclusion

CLC Number:

TG135.1

Liu Yue, Han Shun, Li Yong, Wang Chunxu, Gao Yuanhang, Wang Rui, Li Jianxin. Effect of rare earth lanthanum on fatigue property of 300M steel[J]. Heat Treatment of Metals, 2021, 46(2): 14-19.

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