The influence of hot-working conditions on a structure of high-manganese steel

Grajcar, A.; Opiela, M.; Fojt-Dymara, Gabriela

doi:10.1016/s1644-9665(12)60217-9

Cited by 25 publications

(17 citation statements)

References 8 publications

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“…In cold-rolled steels the dislocation amount is much higher when compared to hot-rolled steels because of the recrystallization effects reducing the dislocation density. [7][8][9] The corrosion resistance of grain boundaries is poor because of a high dislocation density present at these regions. Di Schino et al 10 reported that the corrosion resistance of steel is also related to its grain size.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermomechanical treatment on the corrosion behaviour of Si-and Al-containing high-Mn austenitic steel with Nb and Ti micro-additions

Grajcar¹,

Płachcińska²,

Topolska³

2015

Mater. Tehnol.

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The corrosion behavior of the 27Mn-4Si-2Al type austenitic steel micro-alloyed with Nb and Ti was evaluated in acidic 0.1 M H2SO4 and chloride 3.5 % NaCl environments using potentiodynamic polarization tests. The corrosion properties of solution-treated specimens were compared to thermomechanically processed specimens. In the acidic solution, the steel exhibited a lower corrosion resistance than in the chloride solution, independently of the heat treatment applied. SEM and light micrographs confirmed that the corrosion attack in the acidic solution was higher when compared to the chloride solution. The steel showed evidence of pitting and uniform corrosion in both the acidic and chloride solutions. The corrosion resistance of supersaturated specimens in both 0.1 M H2SO4 and 3.5 % NaCl media was lower when compared to the thermomechanically treated specimens. It was found that the corrosion behavior of the examined high-Mn steel depends on the passivation tendency of the alloying elements (Mn, Al) and the grain size. Keywords: high-Mn steel, austenitic steel, corrosion resistance, passivity, thermomechanical treatment, potentiodynamic polarization test Korozijsko vedenje avstenitnega jekla 27Mn-4Si-2Al, mikrolegiranega z Nb in Ti je bilo ocenjeno v kislem 0,1 M H2SO4 in v kloridnem okolju 3,5 % NaCl, s potenciodinami~nim polarizacijskim preizkusom. Korozijske lastnosti raztopno`arjenih vzorcev so bile primerjane s termomehansko izdelanimi vzorci. V kisli raztopini so bili vzorci manj korozijsko odporni kot v kloridni raztopini, neodvisno od uporabljene toplotne obdelave. SEM in svetlobni posnetki so potrdili, da je bil napad korozije v primerjavi s kloridno raztopino izrazitej{i v kisli raztopini. Na jeklu so bili dokazi za jami~asto in splo{no korozijo v obeh raztopinah, kisli in bazi~ni. Korozijska odpornost prenasi~enih vzorcev v 0,1 M H2SO4 in v 3,5 % NaCl je bila manj{a v primerjavi s termomehansko obdelanimi vzorci. Ugotovljeno je, da je korozijsko vedenje preiskovanega visokomanganskega jekla odvisno od nagnjenosti k pasivaciji legirnih elementov (Mn, Al) in od velikosti zrn.

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Section: Introductionmentioning

confidence: 99%

Effect of thermomechanical treatment on the corrosion behaviour of Si-and Al-containing high-Mn austenitic steel with Nb and Ti micro-additions

Grajcar¹,

Płachcińska²,

Topolska³

2015

Mater. Tehnol.

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“…Such particles are hardly deformed during hot rolling and reduce the anisotropy of the mechanical properties of flat products. 4,15 The mapping of the globular inclusions indicates that Ce and La as well as S and O are distributed uniformly within the particle (Figure 6). the air atmosphere.…”

Section: Non-metallic Inclusionsmentioning

confidence: 99%

“…[1][2][3] Medium-Mn and high-Mn alloys require an even higher concentration of alloying elements. [4][5][6][7][8] Whereas a lot of efforts focus on the relationships between hot-working, heat-treatment, microstructure and mechanical properties, the weldability of AHSS has not received much attention so far.…”

Section: Introductionmentioning

confidence: 99%

Effect of gas atmosphere on the non-metallic inclusions in laser-welded trip steel with Al and Si additions

Grajcar¹,

Różański²,

Kamińska³

et al. 2016

Mater. Tehnol.

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The present study aims to characterize the weldability of a multiphase, automotive steel containing Al and Si additions from the point of view of its tendency to form non-metallic inclusions. Laser welding tests of 2-mm-thick sheets were performed using the keyhole-welding mode and a solid-state laser. The tests were carried out in air and with the use of an argon atmosphere. The distribution, type and chemical composition of the non-metallic inclusions formed in the base metal and fusion zones were analysed. The effect of applying the protective gas on the type and amount of non-metallic inclusions was determined using light and scanning electron microscopy. The chemical composition of the identified particles was assessed using the EDS method. It was found that a protective gas has a beneficial effect on reducing the non-metallic inclusions, but only to a limited extent. The boundary between the complex oxides and the pure aluminium oxides was determined to be 2-3 μm. Keywords: TRIP steel, laser welding, non-metallic inclusions, protective gas, Ar atmosphere, oxidation Namen te {tudije je opredeliti varivost s stali{~a tvorbe nekovinskih vklju~kov v ve~faznem jeklu, ki vsebuje Al in Si, za avtomobilsko industrijo. Izvedeni so bili varilni preizkusi z laserjem na 2 mm debelih plo~evinah z V zarezo. Preizkusi so bili izvedeni na zraku in v za{~itni atmosferi argona. Analizirana je bila razporeditev, vrsta in kemijska sestava nekovinskih vklju~kov v osnovnem materialu in v coni zlivanja. Vpliv uporabe za{~itnega plina na vrsto in koli~ino nekovinskih vklju~kov je bil dolo~en s pomo~jo svetlobne in vrsti~ne elektronske mikroskopije. Kemijska sestava najdenih delcev je bila ugotovljena z metodo EDS. Ugotovljeno je bilo, da ima za{~itni plin ugoden vpliv na zmanj{anje nekovinskih vklju~kov le v omejenem obsegu. Meja med kompleksnimi oksidi in~istimi oksidi aluminija je bila dolo~ena kot 2-3 μm.

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“…The mean area of studies on high-manganese steels concern their high-temperature deformation resistance (Bleck et al, 2007;Cabanas et al, 2006;Dobrzański et al, 2008;Grajcar et al, 2009) and the cold-working behaviour (Dini et al, 2010;Frommeyer & Bruex, 2006;Frommeyer et al, 2003;Graessel et al, 2000;Huang et al, 2006). Much less attention has been paid on their corrosion resistance (Ghayad et al, 2006;Grajcar et al, 2010aGrajcar et al, , 2010bHamada, 2007;Kannan et al, 2008;Mujica Roncery et al, 2010;Opiela et al, 2009).…”

Section: General and Pitting Corrosionmentioning

confidence: 99%

“…The solid solution strengthening caused by Al and Si compensates smaller C content. Sometimes, the steels contain chromium (Hamada, 2007;Mujica Roncery et al, 2010) or microadditions of Nb, Ti and B (Bleck & Phiu-on, 2005;Grajcar et al, 2009;Huang et al, 2006). Mechanical properties of high-manganese steels are dependent on structural processes occurring during cold deformation, which are highly dependent on SFE (stacking fault energy) of austenite (De Cooman et al, 2011;Dumay et al, 2007;Vercammen et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of high-Mn austenitic steels for the automotive industry

Grajcar¹

2012

Corrosion Resistance

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The influence of hot-working conditions on a structure of high-manganese steel

Cited by 25 publications

References 8 publications

Effect of thermomechanical treatment on the corrosion behaviour of Si-and Al-containing high-Mn austenitic steel with Nb and Ti micro-additions

Effect of thermomechanical treatment on the corrosion behaviour of Si-and Al-containing high-Mn austenitic steel with Nb and Ti micro-additions

Effect of gas atmosphere on the non-metallic inclusions in laser-welded trip steel with Al and Si additions

Corrosion resistance of high-Mn austenitic steels for the automotive industry

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