Influence of heat treatment and densification on the load capacity of sintered gears

IF 1.9 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Powder Metallurgy Pub Date : 2022-10-28 DOI:10.1080/00325899.2022.2138171

P. Scholzen, A. Rajaei, J. Brimmers, B. Hallstedt, T. Bergs, C. Broeckmann

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Abstract

ABSTRACT The powder metallurgical manufacturing of gears offers a promising opportunity in terms of reducing the noise emission and increasing the power density. Sintered gears weigh less than conventional gears and potentially have a better noise-vibration-harshness behaviour, due to the remaining porosity. However, the potential of sintered gears for highly loaded applications is not fully utilised yet. Six variants of surface densified and case-hardened sintered gears from Astaloy Mo85 are tested to analyse the impact of the densification and case hardening depths on both the tooth root and flank load bearing capacities. Experimental investigations including metallography and computer tomography are carried out to characterise the microstructure. Furthermore, a simulation model is developed to quantitatively describe the residual stress and hardness profiles after the heat treatment. The load bearing capacity was improved by increasing the densification and case hardening depths, where the effect of the case hardening was identified to be predominant.

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热处理和致密化对烧结齿轮承载能力的影响

齿轮的粉末冶金制造在降低噪声排放和提高功率密度方面提供了一个很有前途的机会。烧结齿轮的重量比传统齿轮轻，并且由于剩余的孔隙率，可能具有更好的噪声-振动粗糙度。然而，高负荷应用的烧结齿轮的潜力尚未得到充分利用。对Astaloy Mo85公司生产的6种表面致密化和表面硬化的烧结齿轮进行了试验，分析了致密化和表面硬化深度对齿根和齿侧承载能力的影响。实验研究包括金相和计算机断层扫描，以表征微观结构。此外，建立了定量描述热处理后残余应力和硬度分布的模拟模型。通过增加致密化和淬火深度来提高合金的承载能力，其中淬火的作用是主要的。

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来源期刊

Powder Metallurgy 工程技术-冶金工程

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3 months

期刊介绍： Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.