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The effect of grain size and retained austenite on the ductile-brittle transition of a titanium-gettered iron alloy

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Abstract

The effect of microstructural changes on the ductile-brittle transition temperature (DBTT) was studied in a titanium-getter ed Fe-8Ni-2 Mn-0.15 Ti alloy. A fairly strong grain size dependence of the transition temperature, 8°C/mm−1/2, was found. Grain size refinement from 38 μm (ASTM #6.5) to 1.5 μm (ASTM #15.5) through a four-step thermal treatment lowered the transition temperature by 162°C. A small amount of retained austenite was introduced into this grain-refined microstructure, and the transition temperature was reduced by an additional 120 ~ 150°C. The reduction of the DBTT due to retained austenite was smaller when the austenite was in a large-grained structure (64°C). The distribution and stability of retained austenite were also studied.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of California, 94720, Berkeley, Calif.

    S. Jin (Lecturer), S. K. Hwang (Graduate Student) & J. W. Morris (Associate Professor)

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  1. S. Jin
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  2. S. K. Hwang
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  3. J. W. Morris
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Jin, S., Hwang, S.K. & Morris, J.W. The effect of grain size and retained austenite on the ductile-brittle transition of a titanium-gettered iron alloy. Metall Trans A 6, 1721–1726 (1975). https://doi.org/10.1007/BF02642299

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  • DOI: https://doi.org/10.1007/BF02642299

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