scholarly journals The influence of niobium content and initial microstructure of steel on the occurrence of Lüders band at the start of the plastic flow during cold deformation

2018 ◽  
Vol 461 ◽  
pp. 012070 ◽  
Author(s):  
S Rešković ◽  
I Jandrlić ◽  
T Brlić
Keyword(s):  
Plastic Flow ◽  
Cold Deformation ◽  
Niobium Content ◽  
Initial Microstructure ◽  
Lüders Band

scholarly journals Influence of Niobium on the Beginning of the Plastic Flow of Material during Cold Deformation

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Stoja Rešković ◽  
Ivan Jandrlić
Keyword(s):  
Plastic Flow ◽  
Deformation Zone ◽  
Microalloyed Steel ◽  
Cold Deformation ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Thermoelastic Effect ◽  
Niobium Microalloyed Steel ◽  
Thermographic Measurement ◽  
Lüders Band

Investigations were conducted on low-carbon steel and the steel with same chemical composition with addition of microalloying element niobium. While tensile testing was carried out, the thermographic measurement was tacking place simultaneously. A specific behavior of niobium microalloyed steel was noticed. Test results have shown that, in the elastic deformation region, thermoelastic effect occurs, which is more pronounced in niobium microalloyed steel. Start of plastic flow in steel which is not microalloyed with niobium begins later in comparison to the microalloyed steel, and it is conducted so that, at the point of maximum stress, deformation zone is formed within which stresses grow. In steel microalloyed with niobium after proportionality limit, comes the occurrence of the localized increase in temperature and the occurrence of Lüders band, which propagate along the sample forming a deformation zone.

Plastic Flow in a Chernov–Luders Band in Ultrafine-Grained 08G2B Steel

2020 ◽  
Vol 23 (4) ◽  
pp. 340-346 ◽  
Author(s):  
V. M. Farber ◽  
A. N. Morozova ◽  
V. A. Khotinov ◽  
M. S. Karabanalov ◽  
G. V. Schapov
Keyword(s):  
Plastic Flow ◽  
Ultrafine Grained ◽  
Lüders Band

scholarly journals MATHEMATICAL MODELING OF THE INFLUENCE PARAMETERS DURING FORMATION AND PROPAGATION OF THE LÜDERS BANDS

2020 ◽  
pp. 595
Author(s):  
Tin Brlić ◽  
Stoja Rešković ◽  
Zoran Jurković ◽  
Gordan Janeš
Keyword(s):  
Mathematical Models ◽  
Plastic Flow ◽  
Local Stress ◽  
Image Correlation ◽  
Maximum Temperature ◽  
Microalloyed Steels ◽  
Band Formation ◽  
The Difference ◽  
Lüders Band ◽  
Lüders Bands

In this study, an analysis of the influence parameters measured by the static tensile test, thermography and digital image correlation was performed during formation and propagation of the Lüders bands. A new approach to the prediction of stresses, maximum temperature changes and strains during the Lüders band formation and propagation is proposed in this paper. Application of the obtained mathematical models of influence parameters gives a clear insight into the behavior of niobium microalloyed steel at the beginning of the plastic flow, which can improve product quality and reduce costs during the forming of microalloyed steels with the appearance of the Lüders bands. The obtained models of influential parameters during formation and propagation of the Lüders bands have been developed by the regression analysis method. The proposed mathematical models showed low deviations of calculated results ranging from 1.34% to 12.37%.The local stress amounts, important in the forming of microalloyed steels since indicating surface roughness and plastic flow possibilities during the Lüders band propagation, are obtained by the mathematical model. It was found that stress amounts increase during the Lüders band propagation in the area behind the Lüders band front. The difference in stress amount between the start of the Lüders band propagation and advanced Lüders band propagation is 25.53 MPa.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 13. DETERMINATION OF DEFORMED STATE UNDER STRAITENED EXTRUSION IN FOURTH CENTRAL AREA OF PLASTIC DEFORMATION

2020 ◽  
Vol 0 (4) ◽  
pp. 43-51
Author(s):  
A. L. Vorontsov ◽  
◽  
I. A. Nikiforov ◽  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Central Area ◽  
Direct Extrusion ◽  
Deformed State ◽  
Cumulative Deformation ◽  
The Given ◽  
General Method

Formulae have been obtained that are necessary to calculate cumulative deformation in the process of straitened extrusion in the central area closed to the working end of the counterpunch. The general method of plastic flow proposed by A. L. Vorontsov was used. The obtained formulae allow one to determine the deformed state of a billet in any point of the given area. The formulae should be used to take into account the strengthening of the extruded material.

SUMITOMO 347AP

Alloy Digest ◽  
1993 ◽  
Vol 42 (8) ◽  
Keyword(s):  
Grain Boundary ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Low Carbon ◽  
Niobium Content

Abstract SUMITOMO 347AP is similar to what could be called Type 347LN and was developed to prevent polythionic acid cracking in chromium depleted grain boundary areas. The columbium (niobium) content is maintained at a ratio of greater than 15 times the carbon in addition to maintaining very low carbon levels. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on forming, heat treating, and joining. Filing Code: SS-548. Producer or source: Sumitomo Metal USA Corporation.

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