Performance and Characterization of TWIP Steels for Automotive Applications

Neu, Richard W.

doi:10.1520/mpc20130009

Cited by 45 publications

(28 citation statements)

References 132 publications

(400 reference statements)

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“…Glavni legirajući element u ovim čelicima je mangan, i to u količini koja može varirati između 15 i 35%. Pored mangana, ovi čelici mogu sadržati do 3%Al, do 3%Si, do 1.5%C, a nekada se dodaju i mikrolegirajući elementi [1][2][3][4][5]. Ovaj način legiranja obezbeđuje prisustvo austenita (površinski centrirane rešetke) na sobnoj temperaturi, čija je dodatna karakteristika veoma niska energija greške u redosledu (EGR) čime je omogućena pojava dvojnikovanja, slika 1.…”

Section: Twip čEliciunclassified

“…Ovaj cilj se postiže korišćenjem čelika povišene do vrlo visoke čvrstoće, uz ispunjenje dodatnih veoma oštrih zahteva za garantovanom žilavošću i/ili tehnološkim zahtevima kao što su sposobnost oblikovanja, zavarljivost, otpornost na koroziju i sl. Sadašnji trend razvoja je okrenut razvoju čelika koji će omogućiti oblikovanje dubokim izvlačenjem do veoma velikog stepena deformacije i odgovarajuće visoke čvrstoće u hladnodeformisanom stanju [1][2][3][4][5][6][7][8][9].…”

Section: Twip čEliciunclassified

“…U toku presovanja (plastična deformacija) dolazi do značajnog deformacionog ojačavanja, tako da finalni deo ima dovoljno veliku čvrstoću koja omogućava konstruktoru značane redukcije poprečnog preseka i smanjenje težine bez uticaja na sigurnost vozila i zadržavanje sposobnosti apsorpcije udara. Prema sadašnjim odnosima cena čelika, ovi čelici su između 60 i 80% skuplji od klasičnih čelika koje treba da zamene, ali je to trošak koji je isplativ na duže staze eksploatacije vozila [1][2][3][4]. Sa druge strane, iako imaju odličan odnos čvrstoća/plastičnost/cena, TWIP čelici još uvek nisu masovno prisutni u proizvodnji auto delova.…”

Section: Twip čEliciunclassified

“…U slučaju kada je EGR mala, parcijalne dislokacije se nalaze na velikom rastojanju, odnosno kada su na velikom rastojanju, EGR ima veliku vrednost. Prema tome, dodatak velike količine mangana ima za cilj da obezbedi austenitnu strukturu na sobnoj temperaturi, kao i veoma malu EGR [1,2,[6][7][8]10].…”

Section: Deformaciono Ponašanjeunclassified

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Savremeni celici - dvojnikovanjem izazvana plasticnost

Radović¹,

Glišić²

2014

Zavarivanje i zavarene konstrukcije

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IzvodDvojnikovanjem Izazvana Plastičnost (TWinning Induced Plasticity -TWIP) u čelicima je fenomen koji je omogućio razvoj zasebne grupe čelika za koju se pretpostavlja da će imati masovnu upotrebu, naročito u autoindustriji. Mikrostruktura ovih čelika na sobnoj temperaturi se sastoji od austenita koji je stabilisan značajnim dodatkom mangana. U toku deformacije dolazi do dvojnikovanja koje značajno povećava otpor deformaciji, uz zadržavanje odlične plastičnosti, tako da su čvrstoće od 1300-2000 MPa praćene izduženjem od minimalno 45%. Sa vremena istraživanja su više usmerena na ispunjenje tehnoloških zahteva, kao što su zavarljivost, koroziona postojanost, mašinska obradljivost i sl.Abstract A significant increase in the research activity dedicated to high manganese TWIP steels has occurred during the past few years, motivated by the breakthrough combination of strength and ductility possessed by these alloys. Here a short review of the relations between microstructure and mechanical properties is presented. This summarized knowledge explains why TWIP steel metallurgy is currently a topic of great practical interest of especially automotive industry. TWIP čeliciStalni zahtevi za povećanjem energetske efikasnosti vozila su jedan od glavnih pokretača usavršavanja postojećih čelika ili razvoja novih čelika za nove generacije automobila. Univerzalni cilj je uvek da se smanje masa vozila, potrošnja goriva i emisija CO 2 . Ovaj cilj se postiže korišćenjem čelika povišene do vrlo visoke čvrstoće, uz ispunjenje dodatnih veoma oštrih zahteva za garantovanom žilavošću i/ili tehnološkim zahtevima kao što su sposobnost oblikovanja, zavarljivost, otpornost na koroziju i sl. Sadašnji trend razvoja je okrenut razvoju čelika koji će omogućiti oblikovanje dubokim izvlačenjem do veoma velikog stepena deformacije i odgovarajuće visoke čvrstoće u hladnodeformisanom stanju [1][2][3][4][5][6][7][8][9].Limovi od TWIP čelika poseduju veoma visok nivo zahtevanih mehaničkih osobina, kao što su visoka vrednost čvrstoće i duktilnosti, što omogućava njihovo korišćenje za izradu autodelova. Glavni legirajući element u ovim čelicima je mangan, i to u količini koja može varirati između 15 i 35%. Pored mangana, ovi čelici mogu sadržati do 3%Al, do 3%Si, do 1.5%C, a nekada se dodaju i mikrolegirajući elementi [1][2][3][4][5]. Ovaj način legiranja obezbeđuje prisustvo austenita (površinski centrirane rešetke) na sobnoj temperaturi, čija je dodatna karakteristika veoma niska energija greške u redosledu (EGR) čime je omogućena pojava dvojnikovanja, slika 1. Slika 1. Tipična struktura Fe-22Mn-0.6C TWIP čelika nakon deformacije 0.3. [1]

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Section: Twip čEliciunclassified

Section: Deformaciono Ponašanjeunclassified

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Savremeni celici - dvojnikovanjem izazvana plasticnost

Radović¹,

Glišić²

2014

Zavarivanje i zavarene konstrukcije

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“…Their low stacking fault energy facilitates deformation twinning, which allows production of steels with high-strength, through strain hardening, and increases ductility (Neu, 2013). Thus, TWIP steels have higher strength and ductility than other steel grades used in the automotive industry.…”

Section: Properties and Applicationsmentioning

confidence: 99%

Influence of hydrogen on some DP, Q&P and TWIP grades of advanced high strength steels for auto construction

Liu¹

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Dual Phase (DP), Quenching and Partitioning (Q&P) and Twinning-Induced Plasticity (TWIP) advanced high-strength steels (AHSS) have demonstrated the capability to meet the demands of fuel efficiency and improved safety performance in auto industry, attributed to their excellent combination of strength and ductility, good formability and high energy absorption capability. However, hydrogen embrittlement (HE) is particularly under concern for the stressed AHSS, causing the deterioration of steel mechanical properties, especially ductility. For the lifetime of a car body, the sources of this hydrogen are extensive, such as steel making, auto construction processes, and corrosion processes in actual service.Therefore, in this doctoral dissertation, efforts have been made to gain a deeper understanding of hydrogen influence on the key DP, Q&P and TWIP steels produced for auto construction. The following issues have been covered:1. Hydrogen influence on the mechanical properties of the DP, Q&P and TWIP steels.2. Hydrogen diffusion and trapping in the key DP and Q&P steels.3. Hydrogen concentration in some DP and Q&P steels.4. Equivalent hydrogen fugacity during electrochemical charging of 980DP steels.The following techniques were employed in this research: optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), electrochemical polarization, hydrogen permeation analysis, linearly increasing stress test (LIST), universal tensile machine (UTM), hot extraction analyser and thermal desorption spectroscopy (TDS).The hydrogen influence on six different DP, Q&P and TWIP steels was studied using LIST with cathodic hydrogen charging. The steels were designated as 980DP, 980DP-650YS, 980DP-700YS, 1200DP, 980QP and 950TW. 980DP referred to a DP steel with tensile strength of 980 MPa. 980DP-650YS and 980DP-700YS referred to a DP steel with tensile strength of 980 MPa and increased yield strength of 650MPa and 700MPa, respectively. 1200DP referred to a DP steel with tensile strength of 1200 MPa. 980QP referred to a Q&P steel with tensile strength of 980 MPa. 950TW referred to a TWIP steel with tensile strength of 950 MPa. All steels exhibited HE susceptibility, manifested by (i) decreased strength, and (ii) reduced ductility and a change from ductile cup and cone fracture to brittle transgranular and/or intergranular fracture. There was no sub-critical crack growth at stresses below the ultimate tensile strength. The hydrogen influence increased with increasing strength, more II negative charging potential, and decreasing stress rate. Hydrogen brittle fracture was associated with the hard martensite phase for DP and Q&P steels.The hydrogen influence was also studied using LIST and UTM (i) for immersion in 3 wt% NaCl, to simulate hydrogen picked in automobile service, and (ii) at substantial loading rates to simulate a crash. Simulated service corrosions caused minimal HE for 980DP and 1200DP, and some HE for...

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Austenitic Steels with TWIP Effect

Fonstein

2015

Advanced High Strength Sheet Steels

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Performance and Characterization of TWIP Steels for Automotive Applications

Cited by 45 publications

References 132 publications

Savremeni celici - dvojnikovanjem izazvana plasticnost

Savremeni celici - dvojnikovanjem izazvana plasticnost

Influence of hydrogen on some DP, Q&P and TWIP grades of advanced high strength steels for auto construction

Austenitic Steels with TWIP Effect

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