TEM observation of dynamic distortion in 2Y-PSZ/steel composites

Guo, Yingjie; Zhou, Yu; Duan, Xiaoming; Li, Dongbo; Lei, T.C.

doi:10.1016/s0272-8842(03)00065-8

Cited by 27 publications

(20 citation statements)

References 2 publications

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“…The studied composite was produced by the conventional powder metallurgical route and hot pressing [3][4][5]. Guo et al thus created TRIP-steel matrix composites with reinforcements made of yttriapartially stabilized zirconia-particles (2Y-PSZ) and obtained an extraordinary high strength in high deformation rate compression experiments.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and compression strength of novel TRIP-steel/Mg-PSZ composites

Biermann

Aneziris

Kolbe

et al. 2010

J. Phys.: Conf. Ser.

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biermann@ww.tu-freiberg.de Abstract. A novel steel-based composite material, composed of metastable austenitic stainless steel as matrix and up to 15 % zirconia as reinforcement, is processed by two powder metallurgy routes. The matrix exhibits the so-called TRIP-effect (TRIP: TRansformationInduced Plasticity) and shows a deformation-induced formation of martensite. Compression tests of rod samples processed by cold isostatic pressing show increased strength compared to the non-reinforced steel matrix up to 20 % strain. Three-point bending tests show, however, reduced ductility for high zirconia contents. Filigree honeycomb structures were produced by a novel extrusion technique with extraordinary high values of specific energy absorption. IntroductionMost Metal-Matrix-Composites (MMCs) have a light-metal matrix such as aluminum or magnesium. MMCs with a steel matrix, however, have not been examined very much up to now, although they may be possible candidates for use as high strength and wear resistant materials [1,2].The combination of a steel matrix which shows the TRIP effect (TRIP: Transformation-Induced Plasticity) with a metastable ZrO 2 -reinforcement also exhibiting a martensitic phase transformation was until now only investigated by the group of Guo et al. with regard to the mechanical properties. The studied composite was produced by the conventional powder metallurgical route and hot pressing [3][4][5]. Guo et al. thus created TRIP-steel matrix composites with reinforcements made of yttriapartially stabilized zirconia-particles (2Y-PSZ) and obtained an extraordinary high strength in high deformation rate compression experiments.In the present work results of a new collaborative research center with the title "TRIP-MatrixComposites -design of tough, transformation reinforced composite materials and structures on FeZrO 2 -basis" are presented. Samples of the steel-matrix composite materials were produced by coldisostatic pressing and a novel extrusion technique which is used conventionally in ceramic technology. First results of a variant of the family of composite materials to be developed were already presented in very recent papers [6][7][8].

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Section: Introductionmentioning

confidence: 99%

Microstructure and compression strength of novel TRIP-steel/Mg-PSZ composites

Biermann

Aneziris

Kolbe

et al. 2010

J. Phys.: Conf. Ser.

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“…Nevertheless, some examples of steel-based composite materials are presented in literature with high wear resistance or strength, respectively. [1][2][3][4][5] In the last decade several scientists have investigated different composite materials and micro-and macrostructure designs according to their ''crashworthiness.'' [6,7] Crashworthiness is the absorption of mechanical energy through controlled failure mechanisms and modes that enable a defined load profile during energy absorption.…”

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confidence: 99%

Microstructure and Compression Strength of Novel TRIP‐Steel/Mg‐PSZ Composites

et al. 2009

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Powder metallurgy is a widely used technology to produce metal and composite components, respectively. This technology has a high efficiency in terms of material and offers the possibility to produce materials which cannot be formed by conventional techniques. In the field of metal matrix composites, hard metals are well-known examples. Other metal matrix composite materials offer high strength, wear resistance, and/or stiffness values combined with significant ductility or toughness, respectively.Most composite materials are based on light metal matrices as aluminum or titanium. However, iron-based composites have drawn only limited attention until now. Nevertheless, some examples of steel-based composite materials are presented in literature with high wear resistance or strength, respectively. [1][2][3][4][5] In the last decade several scientists have investigated different composite materials and micro-and macrostructure designs according to their ''crashworthiness.'' [6,7] Crashworthiness is the absorption of mechanical energy through controlled failure mechanisms and modes that enable a defined load profile during energy absorption. The specific energy absorption (SEA) per unit mass, the SEA per unit volume as well as the interlaminar fracture toughness as a ratio of the fracture toughness parameter to the Young's modulus are expressions in terms of the crashworthiness.In the present study, a novel composite material is suggested, composed of a metastable austenitic stainless steel as matrix which shows the so-called transformation-induced plasticity (TRIP) effect. This TRIP effect yields high strain hardening and high ductility due to the deformation-induced formation of martensite. [8][9][10][11][12] As reinforcing phase, we suggest MgO partially stabilized zirconia (Mg-PSZ), which also shows a martensitic phase transformation from the tetragonal to the monoclinic crystal structure during deformation and/or temperature changes. [13][14][15] The transformation of Mg-PSZ provides a high shear and volume expansion, thus increasing the TRIP-effect of the steel.In terms of this work the ceramic extrusion technology, i.e., a plastic forming process at room temperature has been applied in order to produce cellular honeycomb structures based on MgO partially stabilized zirconia (Mg-PSZ) reinforced austenitic TRIP-steel matrix composites. [16,17] Compact COMMUNICATION Novel composites on basis of austenitic stainless TRIP-steel as matrix with reinforcements of Mg-PSZ are presented. Compact rods were produced by cold isostatic pressing and sintering, square honeycomb samples by the ceramic extrusion technique. The samples are characterized by optical and scanning electron microscopy before and after deformation, showing the microstructure and the deformationinduced martensite formation. The mechanical properties of samples with 5 vol% zirconia are superior compared to zirconia-free samples and composites with higher zirconia contents in terms of bending and compression tests. The honeycomb samples exhibit extraordin...

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“…Four different substrates were used for the deposition of the steel thin films in order to be able to assess the influence of the substrate surface roughness and morphology on the microstructure of the thin films: polished Si wafer, ZrO 2 Subsequently, these thin films were studied regarding their chemical composition and microstructure. The chemical composition of the thin films (and the target used for the deposition) was determined using a combination of the glow-discharge optical emission spectroscopy (GDOES) and the energy dispersive analysis of the characteristic X-rays in a scanning electron microscope (SEM/EDX).…”

Section: Methodsmentioning

confidence: 99%

“…Lewandowski et al [1] investigated the changes in the work hardening of the 7XXX aluminium alloys as caused by the addition of SiC particles having the average sizes of either 5 µm or 13 µm. The composites consisting of partially stabilised zirconia and steel were the subject matter in the references [2] and [3]. In [2], Guo et al reported enhanced dynamic mechanical properties of the 2Y-PSZ/steel; the improvement of the mechanical properties was explained by the martensitic transformation of the metallic matrix in the process of the transformation-induced plasticity (TRIP).…”

Section: Introductionmentioning

confidence: 99%

“…The composites consisting of partially stabilised zirconia and steel were the subject matter in the references [2] and [3]. In [2], Guo et al reported enhanced dynamic mechanical properties of the 2Y-PSZ/steel; the improvement of the mechanical properties was explained by the martensitic transformation of the metallic matrix in the process of the transformation-induced plasticity (TRIP). Wittig et al [3] studied the wear and plastic behaviour of the titanium activated pre-forms based on monoclinic ZrO 2 and/or on the partially stabilised ZrO 2 powders that were infiltrated by the X38CrMoV5-1 steel.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Investigation of the PVD Thin Films of TRIP Steels

Poklad

Klemm

Schreiber

et al. 2010

SSP

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Abstract. The combination of a TRIP steel with the MgO stabilized ZrO 2 ceramics (MgO•ZrO 2 ) is regarded as a promising way to increase the energy absorption in engineering materials. An additional contribution to the energy absorption in the counterparts, i.e. in the TRIP steel and in MgO•ZrO 2 , is expected to arise at the interfaces between the individual materials. However, the mutual crystallographic orientation of the TRIP steel and MgO•ZrO 2 at their interface plays a crucial role both for the adhesion of the counterparts and for the energy absorption process. In this work, the interfaces between the TRIP steel and MgO•ZrO 2 were studied on simplified systems, which were prepared in form of the TRIP steel thin films that were deposited using the magnetron sputtering on various substrates, e.g. Si wafer, MgO•ZrO 2 and the Al 2 O 3 /ZrO 2 composites. The substrates were both single-crystalline (Si wafer) and polycrystalline (MgO•ZrO 2 , Al 2 O 3 /ZrO 2 ). The basic characteristics of the thin films (morphology, thickness, chemical composition) were obtained from the scanning electron micrographs and from the energy dispersive analysis of the characteristic X-rays (EDX). X-ray diffraction (XRD) and transmission electron microscopy with high-resolution (HRTEM) that was complemented by the Fast Fourier Transform (FFT) of the HRTEM micrographs were employed as the crucial experimental methods for the microstructure analysis of these thin films. XRD was used for the phase analysis and for the global texture analysis. The global texture analysis was performed via the pole figure measurements. FFT/HRTEM was used for the characterisation of the local orientation relationships between the TRIP steel and the respective substrate and for the visualisation of the interfaces between individual crystallites.

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TEM observation of dynamic distortion in 2Y-PSZ/steel composites

Cited by 27 publications

References 2 publications

Microstructure and compression strength of novel TRIP-steel/Mg-PSZ composites

Microstructure and compression strength of novel TRIP-steel/Mg-PSZ composites

Microstructure and Compression Strength of Novel TRIP‐Steel/Mg‐PSZ Composites

Microstructure Investigation of the PVD Thin Films of TRIP Steels

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