Microstructural characterization of low-carbon steel processed by high pressure torsion and annealing

被引：6

作者：

Astafurova, Elena G. ^{[1
]}

Dobatkin, Sergey V. ^{[2
]}

Naydenkin, Eugene V. ^{[1
]}

Shagalina, Svetlana V. ^{[2
]}

Zakharova, Galina G. ^{[3
]}

机构：

[1] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Akad Sky Prospect 2-4, Tomsk 634021, Russia

[2] Russian Acad Sci, A A Baikov Inst Met & Mat, Moscow 119991, Russia

[3] Tomsk State Univ, Tomsk 634050, Russia

来源：

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION IV, PTS 1 AND 2 | 2008年 / 584-586卷

关键词：

low-carbon steel; severe plastic deformation; high pressure torsion; submicrocrystalline and nanostructured materials; ULTRAFINE GRAINED FERRITE; C-MN;

D O I：

10.4028/www.scientific.net/MSF.584-586.649

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ultrafine grained low carbon steel processed by high pressure torsion (HPT) has been investigated. Depending on initial state (ferritic-pearlitic state after normalization at 950 degrees C, or martensitic ones after quenching from 950 degrees C and 1180 degrees C), the evolution of the microstructure and the mechanical properties was investigated after HPT and annealing at 400-600 degrees C using transmission electron microscopy and X-ray analysis. It has been shown that HPT of martensitic low carbon steel provides a finer structure then that for ferritic-pearlitic initial state, and the initial martensitic morphology and phase composition is strongly dependent on the temperature of quenching. The initial structure was refined by HPT to 95nm in ferritic-pearlitic state and up to 65 and 50 nm in martensitic ones (after quenching from 950 degrees C and 1180 degrees C, respectively). Such ultrafine grained structures demonstrate substantial mechanical properties and possess a high thermal stability up to 500 degrees C in all investigated states. Annealing for 1 h at 500 degrees C results in grain growth up to 860nm for ferritic-pearlitic initial state and 150-450 nm for martensitic ones.

引用

页码：649 / 654

页数：6

共 12 条

[1] Development of an ultrafine grained ferrite in a low C-Mn and Nb-Ti microalloyed steels after warm torsion and intercritical annealing [J].

Azevedo, G ;

Barbosa, R ;

Pereloma, EV ;

Santos, DB .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 402 (1-2) :98-108

[2] Effect of the initial state of a low-carbon steel on nanostructure formation during high-pressure torsion at high strains and pressures [J].

Dobatkin S.V. ;

Shagalina S.V. ;

Sleptsov O.I. ;

Krasil'nikov N.A. .

Russian Metallurgy (Metally), 2006, 2006 (5) :445-452

[3]

DOBATKIN SV, 2004, ULTRAFINE GRAINED MA, V3

[4] Processing of a low-carbon steel by equal-channel angular pressing [J].

Fukuda, Y ;

Oh-ishi, K ;

Horita, Z ;

Langdon, TG .

ACTA MATERIALIA, 2002, 50 (06) :1359-1368

[5]

Gorelik SS., 2005, RECRYSTALLIZATION ME

[6] Processing of ultrafine ferrite steels [J].

Han, BQ ;

Yue, S .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2003, 136 (1-3) :100-104

[7]

Hirsch P. B., 1977, ELECT MICROSCOPY THI, DOI DOI 10.1016/j.ultramic.2004.12.004

[8] Microstructural development of adiabatic shear bands in ultra-fine-grained low-carbon steels fabricated by equal channel angular pressing [J].

Hwang, Byoungchul ;

Lee, Sunghak ;

Kim, Yong Chan ;

Kim, Nack J. ;

Shin, Dong Hyuk .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 441 (1-2) :308-320

[9] Grain refinement mechanism during equal-channel angular pressing of a low-carbon steel [J].

Shin, DH ;

Kim, I ;

Kim, J ;

Park, KT .

ACTA MATERIALIA, 2001, 49 (07) :1285-1292

[10] Ultrafine grained ferrite-marten site dual phase steels fabricated via equal channel angular pressing: Microstructure and tensile properties [J].

Son, YI ;

Lee, YK ;

Park, KT ;

Lee, CS ;

Shin, DH .

ACTA MATERIALIA, 2005, 53 (11) :3125-3134

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