Effect of Vanadium on Thermal Fatigue Resistance of Cr5 Deposited Metal

Abstract:

In the present work, effect of vanadium on mechanical and thermal fatigue resistance of Cr5 deposited metal is investigated. It is found that hard phases with rich vanadium are mainly distributed at grain boundaries. Vanadium affects the high temperature tensile strength and thermal fatigue cracking obviously. With the increase of vanadium content, high temperature tensile strength of deposited metals shows a initial rise up, then drop for more than 0.54 wt.% V. Toughness and high temperature plasticity are increased up to 0.26 wt.% V, then drop up to 0.89 wt.% V, then toughness and plasticity increase again. Moreover, the thermal fatigue crack length shows a initial decrease up to 0.26 wt. % V, then slightly rise up for 0.89 wt.% V, then crack length shorten again. It is expected that the optimal vanadium content is in a range of 0.18~0.26 wt.% for resisting the thermal crack growth. Fractographic observation shows that the thermal fatigue cracks mainly are transgranular growth. It is felt that the crack length is closely related to microstructure, oxidation resistance, toughness and high temperature plasticity of the deposited alloy

• Periodical: Advanced Materials Research (Volumes 512-515)
• Pages: 1892-1900
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.512-515.1892
• Online since: May 2012
• Authors: Qing Bao Wang, Zhuo Xin Li, Yao Wu Shi, Jing Xiao
• Keywords: Fatigue, Hardness Measurement, Martensite, Microanalysis

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