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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 8/2020

23.05.2020

Formation Mechanism of Microstructural Non-uniformity in the Hot Working of Commercial-Scale Electro-slag Remelted Alloy 690 Ingots

verfasst von: Min Wang, Haoyu Yi, Xia Zhao, Long Zhang, Yingche Ma, Kui Liu

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 8/2020

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Abstract

Microstructural non-uniformity in the wrought material of Alloy 690 is investigated in this study by analyzing the dissolution behavior of intergranular carbides, performing laboratorial forgings to explore the microstructural evolution rules and conduct industrial forgings to verify the laboratorial results. The intergranular carbides in Alloy 690 ESR ingots cannot be fully dissolved at a temperature < 1473 K (1200 °C), and undissolved carbides cause the appearance of carbide strips in the forged microstructure. Carbide strips are confirmed to be responsible for the formation of fine-grain bands in the wrought material by restricting the growth of nearby grains during annealing treatment. Industrial forgings agree well with the laboratorial tests, and it is recommended that in industrial practice the soaking temperature of large ESR ingots should be set between 1473 K and 1493 K (1200 °C and 1220 °C) for better carbide dissolution, and an evident ingot temperature drop prior to deformation should be avoided.
Vorheriger Artikel Effect of Cyclic Intercritical Tempering on the Microstructure and Mechanical Properties of a Low-Carbon Cu-Bearing 7Ni Steel
Nächster Artikel Role of the Secondary Phase η During High-Temperature Compression of ATI 718Plus®

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Metadaten
Titel
Formation Mechanism of Microstructural Non-uniformity in the Hot Working of Commercial-Scale Electro-slag Remelted Alloy 690 Ingots
verfasst von
Min Wang
Haoyu Yi
Xia Zhao
Long Zhang
Yingche Ma
Kui Liu
Publikationsdatum
23.05.2020
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 8/2020
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-020-05813-1

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