Structural and mechanical maintenance of quality of the rolled stock for cold upsetting of metal articles

Пачурин, Г. В.; Goncharova, D. A.; Nuzhdina, T. V.; Mukhina, M. V.; Katkova, Olga V.; Matveev, U I; Tsapina, T.N.

doi:10.1088/1757-899x/632/1/012010

Cited by 5 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The traditional process for manufacturing them is heading and/or cold forging of steel round bars [1]. The bar sections used for this must have the specified mechanical properties and high-quality characteristics to ensure the capacity for cold upsetting [2,3]. To improve the mechanical properties of finished products, they are subjected to a final heat treatment, including quenching and tempering [4].…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Structural State and Properties of 32CrB4 Steel during the Production of High-Strength Fasteners

Stepanov

Koldaev

Arutyunyan

et al. 2022

Metals

View full text Add to dashboard Cite

For the production of high-strength fasteners, bar sections are used, which must withstand significant cold plastic deformation and, therefore, are subjected to a special heat treatment. In the present work, the dependences of the microstructure and mechanical properties of round bars with diameters of 17 mm and 21 mm made of 32CrB4 steel on the heat treatment modes are established. During the study, the methods of optical and scanning electron microscopy, mechanical tests, and hardness measurements were used. Dependences of the degree of spheroidization of the ferrite–pearlite structure and mechanical properties on the spheroidizing annealing mode have been established. It is shown that preliminary obtainment of a bainitic or martensitic structure of rolled products after hot-rolling of steel accelerates the process of pearlite spheroidization. Additional heat treatment, including austenitizing, quenching, and tempering, allows obtaining fasteners of various strength classes: 8.8, 9.8, and 10.9. However, with a guaranteed receipt of strength characteristics for all strength classes, including 12.9, the problem arises of achieving the required values of the relative elongation of steel.

show abstract

Section: Introductionmentioning

confidence: 99%

Evolution of the Structural State and Properties of 32CrB4 Steel during the Production of High-Strength Fasteners

Stepanov

Koldaev

Arutyunyan

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…The automotive fasteners made from calibrated rolled stock by cold upsetting refer to the most important components in mechanical engineering [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The increased requirements in terms of surface defects -their depth and the presence of a decarburized layer are applied to calibrated rolled stock used for cold die forging [7][8][9]. It is relevant for fasteners used in the components of the motor group of automobiles [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Resource-saving preparation of the 38KHGNM steel surface for heading of automobile components

et al. 2020

View full text Add to dashboard Cite

To produce high-quality fasteners for motor group components of automobiles it is necessary to follow the increased requirements to calibrated rolled stock in terms of surface defects. Therefore, the goal of this paper is to study the reasons, types and depth of the surface defects on the calibrated rolled stock from steel 38KHGNM Ø 12.0 mm on the basis of the metallographic analysis. Before cold upsetting, the hot-rolled products are subjected to metal flow and removal of unacceptable surface defects by means of expensive turning operation during which the screw cuts and cracks might appear. It has been defined, that the hot-rolled stock from steel, grade 38KHGNM, diameter 12.0 мм has nonuniform mechanical properties, grooves, laps and partial decarburization on the surface. The heat treatment of the rolled stock with a decarburized layer on the surface contributes to its further decarburization. Poor alignment of calibrated stock during its turning at the turning machine does not enable to completely remove the decarburized layer with minimum skinning of rolled stock. It has been shown that the use of rolled stock from steel 38KHGNM with surface defects and unreasonably high decarburized layer on the surface increases its rejection by 8% and raises the consumption of rolled stock for manufacturing of important fasteners for the motor group of automobiles.

show abstract

“…The machine and mechanical device elements are manufactured based on various technologies [7][8][9]. However, the study of the material fatigue rupture during the process of the fatigue life is associated with a considerable test duration and test conditions [10].…”

Section: Introductionmentioning

confidence: 99%

Fatigue of the automobile structural materials in corrosive environment

et al. 2020

View full text Add to dashboard Cite

Operation of machines and equipment is accompanied by an impact produced by various types of loads leading to fatigue rupture of the structural materials. The most harmful are the vibration loads which in a corrosive environment increase the potential for a failure resulting in human casualties. Therefore, the task of ensuring the operating capability of machine elements and assemblies is one of the outstanding tasks for all industry sectors. In addition, the need for extending the service life and increasing the operational reliability is also determined by a relatively high cost of the machine structural materials and hardware items. Therefore, the execution of the experimental studies of the structural material fatigue features with a view to reduce the metal consumption, to establish new processing methods as well as to select a competitive material, are of the priority for the up-to-date machine building sector. The purpose of this article is to determine any fatigue behavior regularities in automotive materials which were pre-processed according to various technology types and modes and which were operating in a corrosive environment. The experimental data analysis has demonstrated that the longer the cyclic metal materials testing is run, the more sufficient is the decrease of the fatigue resistance of these.

show abstract

Structural and mechanical maintenance of quality of the rolled stock for cold upsetting of metal articles

Cited by 5 publications

References 9 publications

Evolution of the Structural State and Properties of 32CrB4 Steel during the Production of High-Strength Fasteners

Evolution of the Structural State and Properties of 32CrB4 Steel during the Production of High-Strength Fasteners

Resource-saving preparation of the 38KHGNM steel surface for heading of automobile components

Fatigue of the automobile structural materials in corrosive environment

Contact Info

Product

Resources

About