Instantaneous Plastic Flow Properties of Thin Brass Sheets Under Uniaxial and Biaxial Testing

Stachowicz, Feliks

doi:10.21496/ams.2011.003

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…The crack path of tested specimens resulted in a typical brittle quasi-cleavage fracture surface in the ferritic phase, following by induction of microcracks in the austenite grain crossing the ferritic-austenitic boundary. Finally, the crack propagates through the austenite grain [17,18,38,41,45,46]. Challa et al [39] observed a similar behavior in austenitic stainless steels with a nanograins microstructure, and ultrafine grains with an average grain size of 320 nm, associating the deformation mechanism mainly to the deformation twins.…”

Section: Fractography Analysismentioning

confidence: 85%

“…The initial drop on n(ε), belongs to the same range of stage l and stage A of strain hardening rate (Figure 13). As discussed early, this phenomenon is related to dynamic strain softening, such as dislocations annihilation [4,[32][33][34][35], and by formation of Shockley partials dislocations, which are energetically favored as they are afcc/6 <112>, and requires less energy to be formed [33,35,[41][42][43][44], and were already formed by cold-rolling in the other samples. The first increase of n(ε) on AR-T and 4%CR-T has the same range for stage ll and some authors related it to the formation of Table 5.…”

Section: Fractography Analysismentioning

confidence: 96%

“…Furthermore, the new martensite formed by strain in the tensile test tend to be harder than those formed previously, considering that it inherits the structure of dislocations of the austenite that formed it [19]. The extension of stage B is inversely proportional to the deformation of the samples and may be associated with the previous deformation by cold rolling which generated a deformed texture [6,40], especially brass and Goss [27,41], which difficult the transformation of austenite to martensite. Also considering that their microstructures was already more deformed and with the presence of martensite and deformation twins, which hinder the movement of dislocations.…”

Section: Fractography Analysismentioning

confidence: 99%

“…As could be seen for its SFE values, in addition to Figure 13, the steel has different mechanism of deformation, which is difficult to interpret using modelling like Hollomon, Crussard-Jaoult (C-J) analysis, and modified C-J analysis due to the variation of the strain-hardening exponent along the deformation. Stachowicz [41] used a differential n value independent of strain hardening laws, as (Equation 3):…”

Section: Fractography Analysismentioning

confidence: 99%

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Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Alves¹,

Rodrigues²,

Santos³

2022

Tecnol. Metal. Mater. Min.

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The deformation mechanism of lean duplex stainless steel (LDSS) is overly complex not only by their dual phase microstructure, but also due to metastable austenite, which can deform by different mechanisms and transform to martensite by strain. The purpose of this study was to investigate the mechanisms of deformation by tensile test on low deformed cold-rolled samples (4%-22%) of a 2304 LDSS. The microstructure was analyzed by X-ray diffraction, optical microscopy, electron backscattered diffraction and transmission electron microscopy. It was observed the formation of mechanical twinning, ε-martensite, and α'-martensite which evidenced the TRIP effect. The strain hardening rate was calculated and analyzed by Holomon and Crussard-Jaoul modeling together with instantaneous strain hardening exponent, and three operating mechanisms were observed: twinning, dislocations slipping, and strain induced martensite formation (SIM). Brass texture had compromised SIM transformation. The fractography analysis of tensile specimens showed quasi-cleavage occurrence, and dimples formation for this range of pre-deformation.

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Section: Fractography Analysismentioning

confidence: 85%

Section: Fractography Analysismentioning

confidence: 96%

Section: Fractography Analysismentioning

confidence: 99%

Section: Fractography Analysismentioning

confidence: 99%

See 2 more Smart Citations

Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Alves¹,

Rodrigues²,

Santos³

2022

Tecnol. Metal. Mater. Min.

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“…Galvanized sheet behaves like a galvanic cell when the moisture is present, where zinc layer with lower electric potential is the anode and steel rep-resents the cathode. Oxygen is very important factor in the atmospheric corrosion because the thin layers of moisture act as diffusion barriers into the condensed moisture [8,9]. Therefore, reaching the dew point is not necessary for the electrochemical reaction.…”

Section: Resultsmentioning

confidence: 99%

Influence of Corrosive Environment on the Surface Quality of Spot Welds

Spišák¹,

Kaščák²,

Brezinová³

et al. 2011

Acta Mechanica Slov.

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and Vice-Rector for Development and Construction of the University. He served as Vice-Dean for 4 years and Vice-Rector for 8 years. He works in the area of evaluating of material properties, material failures, analysis and quantification of production factors influence in production of thin steel sheet stamping parts, modelling and simulation of technological processes, mainly forming processes. He is national secretary and a member of International Deep-Drawing Research Group. He is author of 5 monographs and more than 200 publications in journals and conference proceedings at Slovakia and abroad. His published works were cited 115 times. He has been worked on 60 grant projects, research tasks and 47 projects solved for industry.

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Forming Limit Diagram of the AMS 5599 Sheet Metal

Frącz¹,

Stachowicz²,

Trzepieciński³

et al. 2013

Archives of Metallurgy and Materials

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Formability of sheet metal is dependent on the mechanical properties. Some materials form better than others -moreover, a material that has the best formability for one stamping may behave very poorly in a stamping of another configuration. For these reasons, extensive test programs are often carried out in an attempt to correlate material formability with value of some mechanical properties. The formability of sheet metal has frequently been expressed by the value of strain hardening exponent and plastic anisotropy ratio. The stress-strain and hardening behaviour of a material is very important in determining its resistance to plastic instability. However experimental studies of formability of various materials have revealed basic differences in behaviour, such as the "brass-type" and the "steel-type", exhibiting respectively, zero and positive dependence of forming limit on the strain ratio. In this study mechanical properties and the Forming Limit Diagram of the AMS 5599 sheet metal were determined using uniaxial tensile test and Marciniak's flat bottomed punch test respectively. Different methods were used for the FLD calculation -results of these calculations were compared with experimental results.Keywords: sheet metal, forming limit, strain hardening, plastic anisotropy Zdolność do przyjmowania odkształceń plastycznych podczas kształtowania blach zależy od ich właściwości mechanicznych. Odkształcalność blach zależy od rodzaju materiału -a ponadto, materiał który wykazuje dobrą odkształcalność podczas kształtowania wytłoczki o określonej geometrii, może sprawiać trudności podczas kształtowania wytłoczki o innej konfiguracji. Z tego powodu prowadzone są liczne prace badawcze mające na celu określenie relacji pomiędzy odkształcalnością blach a wartością parametrów mechanicznych materiału. Przy ocenie odkształcalności blach najczęściej korzysta się z wyznaczania wartości wykładnika krzywej umocnienia odkształceniowego oraz współczynnika anizotropii właściwości plastycznych. Znajomość charakterystyk odkształcenie-naprężenie oraz wskaźników umocnienia odkształceniowego jest bardzo ważna przy określaniu odporności na lokalizację odkształcenia. Badania eksperymentalne blach z różnych materiałów wykazały zasadnicze różnice ich odkształcalności, określane jako "typu mosiądz" oraz "typu stal", przejawiające się brakiem lub wyraźną zależnością poziomu odkształceń granicznych od stanu odkształcenia. W pracy zawarte są wyniki badania właściwości mechanicznych w próbie jednoosiowego rozciągania oraz KOG w teście wg Marciniaka z płaskim stemplem, dla blachy ze stopu AMS 5599. Przeprowadzono obliczenia przebiegu krzywej odkształcalności granicznej przy pomocy różnych metod -wyniki obliczeń porównano z wynikami eksperymentu.

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Instantaneous Plastic Flow Properties of Thin Brass Sheets Under Uniaxial and Biaxial Testing

Cited by 3 publications

References 15 publications

Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Influence of Corrosive Environment on the Surface Quality of Spot Welds

Forming Limit Diagram of the AMS 5599 Sheet Metal

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