scholarly journals Barkhausen Noise Emission in AISI 321 Austenitic Steel Originating from the Strain-Induced Martensite Transformation

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 429
Author(s):  
Miroslav Neslušan ◽  
Jana Šugárová ◽  
Petr Haušild ◽  
Peter Minárik ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Martensite Transformation ◽  
Uniaxial Tensile ◽  
Barkhausen Noise ◽  
Uniaxial Tensile Test ◽  
Noise Emission ◽  
Martensite Fraction ◽  
Strain Induced Martensite ◽  
Aisi 321

This paper investigates the sensitivity of the Barkhausen noise technique against strain-induced martensite in AISI 321 austenitic stainless steel. Martensite transformation was induced by the uniaxial tensile test, and a variable martensite fraction was obtained at different plastic strains. It was found that Barkhausen noise emission progressively increases with plastic straining, while its evolution is driven by the martensite fraction in the deformed matrix. This study also demonstrates that the uniaxial tensile stressing produced a certain level of stress and magnetic anisotropy in the samples. The number of strong Barkhausen pulses increased for more developed strains, whereas the position of the Barkhausen noise envelope remained less affected. This study clearly demonstrates the good sensitivity of the Barkhausen noise technique against the degree of martensite transformation in austenitic stainless steel. Moreover, this technique is sensitive to the direction of the exerted load.

Application of Pre-Strained Steels in Empirical Correlation Between Small Punch Test and Uniaxial Tensile Test

2020 ◽  
Vol 12 (6) ◽  
pp. 892-898
Author(s):  
Gang Liu ◽  
Kai-Shu Guan ◽  
Ji-Ru Zhong
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Tensile Test ◽  
Maximum Load ◽  
Empirical Correlation ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Small Punch Test ◽  
Punch Test

In order to research the method of strength empirical correlation between conventional small punch test (SPT) and uniaxial tensile test, a series of austenitic stainless steel including pre-strained SUS304 have been tested in this study. The conventional SPT is conducted on a small disc-shaped specimen whose edge is firmly gripped by a die, and the specimen is deformed by a punch. The method of empirical correlation between SPT and uniaxial tensile test is a direct way to obtain the mechanical properties of materials. Through establishing the strength empirical correlation, it can achieve to calculate the strength of material by SPT which is nondestructive to equipments. However, the per-strained steels have never been tested in this method. This study is to fill that gap and to obtain the empirical correlation between SPT and uniaxial tensile test with pre-strained steel. In this study, a series of austenitic stainless steel including SUS304 after different levels of pre-strain were tested successively by uniaxial tensile test and SPT. It is found that the tensile strength obtained from uniaxial tensile test increases with the increasing levels of pre-strain. However, the maximum load obtained from prestrained SPT specimen does not increase with the increasing levels of pre-strain. It is contradictory to the linear relation between maximum load and tensile strength. According to the analysis of conventional discshaped SPT specimen, the directions of maximum load obtained from SPT and tensile strength from tensile test are not uniform. It results in the non-linearity between the maximum load and the tensile strength with pre-strained steel, and it indicates the pre-strained steel cannot be applied to the conventional disc-shaped SPT specimen. Furthermore, the prestrained steel is a typical kind of anisotropic material. Therefore, extending to anisotropic material, the conventional disc-shaped SPT specimen is not suitable for the method of strength empirical correlation.

Experimental Study on Electroplastic Effect in AISI 316L Austenitic Stainless Steel

2015 ◽  
Vol 792 ◽  
pp. 568-571 ◽  
Author(s):  
Marco Breda ◽  
Francesco Michieletto ◽  
Elizaveta Beridze ◽  
Claudio Gennari
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Electric Current ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Aisi 316L ◽  
Flow Properties ◽  
Electroplastic Effect ◽  
316L Austenitic Stainless Steel ◽  
Electrically Assisted Manufacturing

Electrically Assisted Manufacturing (EAM) is a recently developed method for materials forming based on the Electro-Plastic Effect (EPE) induced by electric current on the flow properties of the material and enhancing their workability. In this technique, the concept of dislocations/electrons interaction and the localized resistive heating provided by electric current were found to be the main responsible for the observed increase in materials formability. However, the joule heating may hinder the induced EPE, since heat and electricity are contemporarily both present, and separation between these two contributions is mandatory to better understand the solely effect of electricity on plastic flow. The present experimental work on an AISI 316L austenitic stainless steel is aimed to study EPE by separating the effects of current from those of heating during EAM uniaxial tensile test, in order to ascribe the relative contributions.

Finite element simulation for tensile and impact test of activated TIG welding of AISI 321 austenitic stainless steel

2019 ◽  
Vol 233 (11) ◽  
pp. 2323-2334 ◽  
Author(s):  
S Mohan Kumar ◽  
N. Siva Shanmugam
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Weld Metal ◽  
Prediction Error ◽  
Impact Test ◽  
Fe Analysis ◽  
Tig Welding ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Aisi 321

Tungsten inert gas (TIG) welding process have been widely accepted in industries using stainless steel, titanium alloys and other 21st century metals to achieve high-quality weldments. TIG welding is mostly used to join workpieces with a thickness of less than 6 mm. To overcome this limitation of TIG welding, activated TIG welding (A-TIG) was employed to achieve high penetration depth in a single pass using activated flux. This article presents a study of experimental and finite element (FE) analysis on the mechanical behaviour of AISI 321 plate samples (base metal and weld metal) by performing a uniaxial tensile and Charpy impact test. The uniaxial tensile test is carried out for the base metal (BM) and A-TIG weld metal (WM) with a loading rate of 1 mm/min at room temperature. In the current FE analysis, the temperature and strain-rate dependent Johnson-Cook (J-C) model was utilised. The results of stress–strain values and impact energy predicted by the FE analysis agree with experimental results. Also, the fracture behaviour of the experimental and FE simulations were identical to ductile mode of fracture. In the FE analysis, the neck and fracture locations of the BM and WM specimens were very similar to the experiment. It is evident that the JC model results of uniaxial tensile test have a prediction error of 0.51% and 0.48% for BM and WM respectively. Also, similar accuracy with a prediction error of 2.21% and 3.19% for BM and WM Charpy test specimen, respectively. Scanning electron microscope results show that the failure of the BM and WM is initiated by ductile nature of the fused material at the joint.

scholarly journals Experimental and Numerical Evaluation of Mechanical Properties of 3D-Printed Stainless Steel 316L Lattice Structures

2021 ◽  
Author(s):  
M. Carraturo ◽  
G. Alaimo ◽  
S. Marconi ◽  
E. Negrello ◽  
E. Sgambitterra ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Mechanical Behavior ◽  
Numerical Simulations ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Lattice Structures ◽  
Stainless Steel 316L ◽  
Research Attention ◽  
Octet Truss

AbstractAdditive manufacturing (AM), and in particular selective laser melting (SLM) technology, allows to produce structural components made of lattice structures. These kinds of structures have received a lot of research attention over recent years due to their capacity to generate easy-to-manufacture and lightweight components with enhanced mechanical properties. Despite a large amount of work available in the literature, the prediction of the mechanical behavior of lattice structures is still an open issue for researchers. Numerical simulations can help to better understand the mechanical behavior of such a kind of structure without undergoing long and expensive experimental campaigns. In this work, we compare numerical and experimental results of a uniaxial tensile test for stainless steel 316L octet-truss lattice specimen. Numerical simulations are based on both the nominal as-designed geometry and the as-build geometry obtained through the analysis of µ-CT images. We find that the use of the as-build geometry is fundamental for an accurate prediction of the mechanical behavior of lattice structures.

Sign in / Sign up

Export Citation Format

Share Document