Effect of silicon nitride microstructure on characteristics of FSW tool for steel and tool life

Q4 Materials Science

Welding International Pub Date : 2023-05-22 DOI:10.1080/09507116.2023.2203532

Kai Funaki, Y. Morisada, T. Fukasawa, Y. Abe, H. Fujii

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引用次数: 0

Abstract

Abstract Friction stir welding (FSW) has been widely used in the welding of low melting point metal, such as Al alloy or Cu alloy. However, high melting point metal, such as Fe alloy, it is difficult to be welded by FSW because of short life or the high price of FSW tools. Silicon nitride tool can have both long life and low cost. In order to obtain design guideline for silicon nitride FSW tool, the relationship between the mechanical properties and tool life was examined. Two silicon nitride materials which had different microstructure were prepared. One of them had lower high-temperature mechanical properties and the other had higher properties. Tools made by them could join the SUS 304 plate under the following conditions; welding speed was lower than 1000 mm/min, and revolutional pitch was lower than 1.8 mm/r. Even the tool which had excellent mechanical properties at high temperature worn faster when the joining temperature was 950 °C or higher. The tool with excellent high-temperature mechanical properties had a tool life 6 times longer than the other tool. It is considered the life of the tool was improved when the crystallization of the grain boundary phase promoted the rise in the melting point of the grain boundary phase and the precipitation of silicon oxide during FSW.

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氮化硅组织对钢FSW刀具特性及刀具寿命的影响

摘要搅拌摩擦焊在低熔点金属，如铝合金、铜合金的焊接中得到了广泛的应用。然而，熔点高的金属，如铁合金，由于使用寿命短或FSW工具价格高，很难用FSW焊接。氮化硅工具具有使用寿命长、成本低等优点。为了获得氮化硅FSW刀具的设计准则，研究了氮化硅FSW刀具的力学性能与刀具寿命的关系。制备了两种微观结构不同的氮化硅材料。其中一种具有较低的高温力学性能，另一种具有较高的高温力学性能。他们生产的工具可以在以下条件下连接SUS 304板;焊接速度小于1000mm /min，旋转节距小于1.8 mm/r。即使是在高温下具有优良机械性能的刀具，当连接温度达到950℃或更高时，磨损速度也会加快。该刀具具有优异的高温机械性能，刀具寿命是其他刀具的6倍。认为在搅拌过程中晶界相的结晶促进了晶界相熔点的升高和氧化硅的析出，提高了刀具的寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.