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Microstructure and Tensile Properties of the Fe-32%Ni-4%Co Alloy During Cryorolling and Subsequent Annealing

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Abstract

The Fe-32%Ni-4%Co alloy was cryorolled to produce thickness reductions of 10, 40, 60 and 90%; then, the strips with a final thickness of 0.52 mm were annealed at 893, 923 and 943 K for different soaking times. The x-ray diffraction measurements indicated that both thermally induced α′-martensite (α′-M) and deformation-induced α′-M were present in the tested alloy. The thermally induced α′-M was mainly lath-shaped, while the morphology of the deformation-induced α′-M gradually changed from lath-shaped to irregular-shaped according to transmission electron microscopy observations. After the 90% reduction due to cryorolling, the total volume fraction of α′-M reached 75.6%, and the average ultimate tensile strength (UTSav.) was significantly improved from 430.3 to 1306.8 MPa. Upon subsequent annealing at 923 K for 5 min, the tested alloy mainly consisted of a large number of fine grains and a few coarse grains (CGs). In addition, several deformed structures were also observed. As the annealing time increased to 10 and 30 min, the fraction of CGs increased, and a bimodal grain size distribution was obtained, while the deformed structures were still present. The temperature of the reverse phase transformation of α′-M → γ was lower than the recrystallization temperature, which may be the main reason for the bimodal grain distribution. With this bimodal grain structure, the alloy exhibited a combination tensile strength of 543.3 MPa and an average elongation of 34.1%.

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Acknowledgments

The authors are grateful for the joint financial support from the National Natural Science Foundation of China and Baowu Steel Group Co. Ltd. (Grant No. U1660205).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Changsheng Li, Jianjun Zheng, Shuai He, Ban Cai & Yanlei Song

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  1. Changsheng Li
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  2. Jianjun Zheng
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  5. Yanlei Song
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Correspondence to Changsheng Li.

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Li, C., Zheng, J., He, S. et al. Microstructure and Tensile Properties of the Fe-32%Ni-4%Co Alloy During Cryorolling and Subsequent Annealing. J. of Materi Eng and Perform 27, 6657–6664 (2018). https://doi.org/10.1007/s11665-018-3746-3

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  • DOI: https://doi.org/10.1007/s11665-018-3746-3

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