Influence of modes of annealing on tendency to brittle fracture of large-size forgings from high-strength corrosion-resistant steel 18kH13N4K4S2АМ3

Voznesenskaya N.M., Shestakov I.I., Tonysheva О.А.
UDC
669.14.018.8
DOI
10.18577/2307-6046-2016-0-12-4-4
Article PDF (Russian) (688.42 KB)
How to cite
Voznesenskaya N.M., Shestakov I.I., Tonysheva О.А. Influence of modes of annealing on tendency to brittle fracture of large-size forgings from high-strength corrosion-resistant steel 18kH13N4K4S2АМ3 // Proceedings of VIAM. 2016. No. 12. DOI: 10.18577/2307-6046-2016-0-12-4-4. URL: https://test.viam.ru/en/journal/2016/12/4
Keywords
high-strength corrosion-resistant steel, fragile fracture, annealing.
Abstract

Influence of modes of annealing on tendency to fragile fracture during storage or when machining large-size forgings from high-strength corrosion-resistant steel 18kH13N4К4S2АМ3 is investigated. It is revealed that the reason of fragile fracture is violation of modes of annealing, bringing to existence in structure of not tempered martensite that in the presence of residual stress in a forging leads to cracking. It is shown that an optimum mode of annealing is the mode allowing to get structure of the high-tempered martensite with a small amount of stable retained austenite (4–10 %) and evenly distributed carbides (carbonitrides). Work is executed within implementation of the complex scientific direction 8.2. «High-strength constructional and corrosion-resistant welded steels with high fracture toughness» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

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