Study of Impact Toughness Anisotropy and Tendency Towards Lamination of Strenx 650 MC and Strenx 700 MC Steels After Thermomechanical Rolling

Mechanical properties are investigated for tensile and impact bending in longitudinal and transverse Charpy and Menage specimens of Strenx 650 MC and Strenx 700 MC steels, produced by thermomechanical rolling technology. A marked effect is established for impact specimen cutting direction on critica...

Full description

Saved in:
Bibliographic Details
Published in:Metallurgist (New York) 2018-11, Vol.62 (7-8), p.753-765
Main Authors: Goritskii, V. M., Shneiderov, G. R., Guseva, I. A.
Format: Article
Language:English
Subjects:
Aluminum oxide
Anisotropy
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crack propagation
Ductile fracture
Fracture toughness
High strength steels
Impact strength
Low level
Materials Science
Mechanical properties
Metallic Materials
Thermomechanical properties
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Mechanical properties are investigated for tensile and impact bending in longitudinal and transverse Charpy and Menage specimens of Strenx 650 MC and Strenx 700 MC steels, produced by thermomechanical rolling technology. A marked effect is established for impact specimen cutting direction on critical brittleness temperatures T 50 (50% of the ductile component in a fracture) and T 34 ( KC V = 34 J/cm 2 ). For transverse specimens of rolled product 6 and 10 mm thick values of T 50 and T 34 are higher by 25–30 °C than for longitudinal specimens. Impact strength anisotropy coefficient for the studied steels varies in the range of 3.2–12.2. During tests on transverse specimens of steel Strenx 650 MC 6 mm thick an anomalous character (a sharp inflexion in the line for changes of KC V-B and KC U-B correlation) is detected: on the linear segment extending 2.4 mm for Charpy specimens and 2.8 mm on Menage specimens a low level of work for ductile crack propagation is revealed ( A r = 1.2 J/cm 2 ), then work for crack propagation increases by more than an order of magnitude (121 and 570 J/cm 2 ). A marked effect is demonstrated for coarse carbonitride-type inclusions based on titanium, and oxides based on Al 2 O 3 on formation of large pits, contributing to formation of laminations and an increased tendency towards Menage and Charpy impact strength anisotropy.
ISSN:0026-0894
1573-8892
DOI:10.1007/s11015-018-0717-8