INFLUENCE OF QUENCHING TEMPERATURE ON MARTENSITE TYPE IN Ti-4Al-4.5Mo ALLOY

doi:10.3724/SP.J.1037.2010.00157

Acta Metall Sin

2010, Vol. 46

Issue (9): 1061-1065 DOI: 10.3724/SP.J.1037.2010.00157

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INFLUENCE OF QUENCHING TEMPERATURE ON MARTENSITE TYPE IN Ti-4Al-4.5Mo ALLOY

LI Changfu¹⁾, LI Geping¹⁾, YANG Yi²⁾, YANG Ke¹⁾

1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2) Northwest Institute for Non-ferrous Metal Research, Xi'an 710016

Cite this article:

LI Changfu LI Geping YANG Yi YANG Ke. INFLUENCE OF QUENCHING TEMPERATURE ON MARTENSITE TYPE IN Ti-4Al-4.5Mo ALLOY. Acta Metall Sin, 2010, 46(9): 1061-1065.

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Abstract

There are many discrepancies in the literatures concerning the martensite constitution in the α+β double phase titanium alloys after quenching, so the Ti-4Al-4.5Mo alloy was selected to analysis further the martensite phase transformation in the alloy. The results show that when the quenching temperature is above the (α+β)/β transformation temperature (925 ℃), the hexagonal martensite (α´) formed. With the decrease of quenching temperature, another kind of martensite with orthorhombic structure (α´´) appeared which can coexist with α´ in a certain temperature range. In the sample quenched at 800 ℃, the α´´ disappeared, and the alloy only contains α and β phases. The α´´ martensite reduced the hardness of martensite transformed structure remarkably. EDS analysis indicated that the content of β stabilized element (Mo) is not the only factor determining the martensitic type.

Key words: titanium alloy quenching martensitic phase microhardness

Received: 03 April 2010

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00157 OR https://www.ams.org.cn/EN/Y2010/V46/I9/1061

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