SERRATED FLOW IN A FeNi–BASED AUSTENITIC ALLOY

doi:10.3724/SP.J.1037.2011.00155

Acta Metall Sin

2011, Vol. 47

Issue (8): 1017-1021 DOI: 10.3724/SP.J.1037.2011.00155

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SERRATED FLOW IN A FeNi–BASED AUSTENITIC ALLOY

ZHAO Shuai, LI Xiuyan, RONG Lijian

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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ZHAO Shuai LI Xiuyan RONG Lijian. SERRATED FLOW IN A FeNi–BASED AUSTENITIC ALLOY. Acta Metall Sin, 2011, 47(8): 1017-1021.

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Abstract Tensile tests on a FeNi–base austenitic alloy, with different amount of twin boundaries, were conducted at different temperatures and three strain rates, respectively. The results show that serrated flow occurs at temperatures from 300 to 700 ℃. This serrated flow exhibits bulge–like serrations at temperatures from 300 to 600 ℃ and stress–loss serrations at 700 ℃, which manifests the nature of thermal activation, i.e. higher temperatures boost serrations and higher strain rates depress them. Investigations on samples deformed at room temperature (no serrated flow) and 400 ℃ (prominent serrated flow) indicate that twin boundaries are strong enough to block slip deformation at 400 ℃. As a result, stress accumulates on twin boundaries and bulge–like serrations appear on the tensile curves. Effect of twin boundary amount on the morphologies of serrations testified this mechanism.

Key words: serrated flow FeNi–based alloy twin boundary dislocation slip deformation

Received: 23 March 2011

ZTFLH:

TG142.25

Fund:

Supported by National Natural Science Foundation of China (No.50601028)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00155 OR https://www.ams.org.cn/EN/Y2011/V47/I8/1017

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