On the Deformation Behaviour and Martensitic Transformations of Metastable Austenitic Steels

Onyuna, M.; Oettel, H.; Martin, Ulrich; Weiß, Andreas

doi:10.1002/adem.200400411

Cited by 29 publications

(24 citation statements)

References 12 publications

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“…11 and the transformation zones obtained from eq. (27) are plotted in Fig. 12 at four different temperatures for h (σ, z = 0) = 0.…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

“…For convenience, the calibrated material parameters are summarized in Table 2. The behavior of the model, compared to experimental data taken from [27], is shown in Fig. 1.…”

Section: Constitutive Modelmentioning

confidence: 99%

“…This leads to the θ-dependence of the effective stress being given by Figure 9: Ramberg-Osgood relation fit to experimental data taken from [27]. The corresponding Ramberg-Osgood parameter values are given in Table 3.…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

“…Considering the experimental data in [27] on SUS 304 austenitic stainless steel, as shown in Fig. 1, values of the parameters from the RambergOsgood relation in eq.…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

“…for h = 0, the radius of the transformation zone is given by (27) In eq. (27), F mech was introduced to denote F mech evaluated using the σ ij stress components in eq. (21).…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

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Crack tip transformation zones in austenitic stainless steel

Hallberg

Banks‐Sills

Ristinmaa

2012

Engineering Fracture Mechanics

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Crack tip conditions in SUS 304 austenitic stainless steel are studied using a constitutive model in which the martensitic phase transformation is an integral part. The phase transformation occurring in the crack tip region gives rise to fracture toughening of the material whereby the resistance against crack initiation, as well as the macroscopic material response are strongly altered by the presence of a martensitic phase. The constitutive model employed herein permits studying the transformation zones under different isothermal conditions. Local crack tip conditions and related plastic deformation is confirmed to depend strongly on the varying extent of the martensitic phase transformation at different temperatures. The shape and size of the plastic and transformation zones in the neighborhood of the crack tip are obtained from numerical simulations, as well as derived analytically.

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“…11 and the transformation zones obtained from eq. (27) are plotted in Fig. 12 at four different temperatures for h (σ, z = 0) = 0.…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

“…For convenience, the calibrated material parameters are summarized in Table 2. The behavior of the model, compared to experimental data taken from [27], is shown in Fig. 1.…”

Section: Constitutive Modelmentioning

confidence: 99%

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

“…Considering the experimental data in [27] on SUS 304 austenitic stainless steel, as shown in Fig. 1, values of the parameters from the RambergOsgood relation in eq.…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

“…for h = 0, the radius of the transformation zone is given by (27) In eq. (27), F mech was introduced to denote F mech evaluated using the σ ij stress components in eq. (21).…”

Section: Plastic and Transformed Zones At The Crack Tip From The Hrr mentioning

confidence: 99%

See 3 more Smart Citations

Crack tip transformation zones in austenitic stainless steel

Hallberg

Banks‐Sills

Ristinmaa

2012

Engineering Fracture Mechanics

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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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Temperature Effects on the Deformation Behavior of High‐Density TRIP Steel and Particle‐Reinforced TRIP Steel/Zirconia Honeycombs Under Quasi‐Static Compressive Loading

et al. 2013

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The interactions between microstructure evolution and mechanical properties of square-celled TRIP steel and particle-reinforced TRIP steel/zirconia honeycombs are investigated over a wide range of test temperatures. Based on a powder metallurgical route of a ceramic extrusion technology, twodimensional channeled structures are made of an austenitic AISI 304 CrNi-steel or a TRIP steel matrix composite with up to 10 vol.% of a MgO partially stabilized zirconia (Mg-PSZ) ceramic. Honeycomb specimens with a cell frame of 196 cpsi and a relative density of 0.37 (viz. 2.9 g cm À3 ) are tested under quasi-static compression in out-of-plane loading direction at temperatures between -196 8C and 150 8C. During compression, the cellular materials deform in a strain-dominated buckling mode initiating a plastic hinge formation in the cell walls at higher strain levels. Their crush resistance is intensively controlled by the material design including the plastic yield and strengthening mechanisms of the TRIP steel matrix and the constraint or particle reinforcement effects of the embedded zirconia ceramic. Since the thermodynamic driving force for the a 0 -martensite nucleation and the intrinsic stacking fault energy are strongly influenced by temperature, different material strengthening and softening processes and a varied microstructure evolution are detected. A sigmoidal initial stress-strain response as well as the highest compression stress are measured at test temperatures below room temperature due to a pronounced a 0 -martensite volume fraction. However, at higher test temperatures, mechanical twinning and dislocation glide are the dominant deformation mechanisms. In summary, strength, ductility and energy absorption which identify the crashworthiness of the honeycombs, are significantly affected by the temperature-sensitive macro-and microstructure phenomena. 646 wileyonlinelibrary.com ß

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On the Deformation Behaviour and Martensitic Transformations of Metastable Austenitic Steels

Cited by 29 publications

References 12 publications

Crack tip transformation zones in austenitic stainless steel

Crack tip transformation zones in austenitic stainless steel

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

Temperature Effects on the Deformation Behavior of High‐Density TRIP Steel and Particle‐Reinforced TRIP Steel/Zirconia Honeycombs Under Quasi‐Static Compressive Loading

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