Microstructural and fracture analysis of aged cast duplex steel

Dyja, D.; Stradomski, Z.; Pirek, A.

doi:10.1007/s11223-008-0032-x

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…In literature, the influence of the grain boundaries on total energy dissipation in the material is well known . Moreover, in this paper, the experimental analysis on temperature variations confirms that an amount of the supplied total mechanical energy is not completely transformed into heat but remains stored in the material.…”

Section: Discussion Of the Correlation Between Temperature Variationssupporting

confidence: 68%

“…This is the case, for instance, with brittle and high thermal diffusivity materials such as aluminium alloys and martensitic steels . Moreover, the intrinsic heterogeneity can determine differing thermal behaviour of the material due to the presence of internal microstructural processes associated with fatigue damage, as in the case of biphasic microstructures. Following these considerations, the validity of the method based on the plateau temperature measurements should be verified.…”

Section: Introductionmentioning

confidence: 99%

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Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Finis

Palumbo

Silva

et al. 2017

Fatigue Fract Eng Mat Struct

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A critical aspect of standard test methods for fatigue characterization is that they do not provide any information on heat dissipation in the material and involve very expensive experimental campaigns in time and costs. In recent years, thermographic methods capable of reducing testing time have been developed, also providing more information on damage occurring in the material. A commonly used approach is based on the assessment of the temperature plateau during a stepwise loading procedure. At times, however, this approach can fail if temperature stabilization is not achieved. In this regard, in this paper, a new approach based on the assessment of 3 different thermal indexes was proposed to estimate the fatigue limit of 3 stainless steels: AISI 316, 17‐4PH, and ASTMA890 grade 4a, respectively, exhibiting fully austenitic, fully martensitic, and duplex biphasic microstructure. The fatigue tests were carried out by using a stepwise loading procedure, under loading ratio of 0.5. The analysis demonstrated the possibility to further reduce testing time and, consequently, the fatigue experimental campaign. Moreover, some ideas are discussed about how to justify the different thermal behaviour of a biphasic stainless steel, in total temperature variation. Moreover, a discussion of results regarding the various thermal behaviours of the investigated steels and a possible correlation with the microstructure has been proposed.

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Section: Discussion Of the Correlation Between Temperature Variationssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Finis

Palumbo

Silva

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Spectrum 2 were taken at normal area and Spectrum 1 at σ phase present area and the results are shown in Table II. σ phase having a different content of chromium (30-50%) and molybdenum (5-10%) [10] and the same has been obtained with spectrum 1 which was taken in σ phase area. After the solution treatment steel is characterized by ferritic-austentic structure as shown in Fig.…”

Section: Microstructure Evolution During Processingmentioning

confidence: 57%

Effect of Secondary Phase Precipitation on Impact Toughness of Duplex Stainless Steel

Powar

Gujar

Manthani

et al. 2017

MSF

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Duplex Stainless Steel (DSS) combines good mechanical strength and ductility with moderate to good corrosion resistance in a variety of environments. DSS are prone to the formation of various intermetallic phases (σ, χ, π, R), carbides (M23C6) and nitrides (Cr2N), when it exposed to temperatures lower than 1000°C. This study focuses on effect of secondary phase precipitation on impact toughness of ASTM A182 DSS. Cylindrical bar of DSS was open die forged in the temperature range of 1200-1050°C. After the forging, the bar was slow cooled by covering it with ceramic wool. This leads to the formation of σ phase at the ferrite/austenite interfaces and significantly reduced the impact toughness of the material. Solution treatment was done at different temperature and effect on toughness studied. The microstructural changes produced as consequences of the distinct test condition have been analyzed by means of optical and electron microscopy, X-ray diffraction.

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“…D. Dyja et al reported hardness and brittleness of alloys are increased by formation of nano-size precipitates phase. 23) This report suggests that there is possibility of formation of nano-size precipitates, which is difficult to verify using a SEM observation.…”

Section: Resultsmentioning

confidence: 84%

Development of High Modulus Ti–Fe–Cu Alloys for Biomedical Applications

et al. 2013

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TiFeCu alloys with higher Young's modulus, hardness and compressive mechanical properties than those of the existing Ti alloys were developed using a d-electrons alloy design method in order to improve Young's modulus, hardness and compressive properties of Ti and existing Ti alloys for use as metallic stents. Their microstructures, Young's modulus, hardness and compressive mechanical properties were investigated both before (as-cast) and after heat-treatments performed under a high-purity argon atmosphere at 1173 K for 21.6 and 86.4 ks.The studied TiFeCu alloys consist of the ¢-Ti phase and dendritic TiFe intermetallic phase. Moreover, the area fraction of the TiFe intermetallic phase increases with increasing atom ratio (Fe + Cu)/Ti of the alloys and with the heat-treatment time.The Young's modulus of the studied TiFeCu alloys increases from 110 GPa (Ti 78 Fe 18 Cu 4 alloy) to 145 GPa (Ti 68 Fe 30 Cu 2 alloy) with increasing atom ratio (Fe + Cu)/Ti of the alloys and the area fraction of the TiFe intermetallic phase. However, the Young's modulus is saturated or slightly decreased when the area fraction of the TiFe intermetallic phase is more than 34%. The Vickers hardness of the as-cast alloys increases from 490 HV (Ti 78 Fe 18 Cu 4 alloy) to 550 HV (Ti 63.4 Fe 30 Cu 6.6 alloy) with increasing atom ratio (Fe + Cu)/Ti of the alloys and area fraction of the TiFe intermetallic phase. On the other hand, the Vickers hardness of the heat-treated alloys is lower than that of the as-cast alloys, despite the increase in the area fraction of the TiFe intermetallic phase after the heat-treatment. The heat-treated alloys have better compressive properties than those of the as-cast alloys and the reported TiFeCu alloys. The compressive strength and strain of the heat-treated Ti 67 Fe 27 Cu 6 alloys reach to 2131 MPa and 24.5%, respectively.

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Microstructural and fracture analysis of aged cast duplex steel

Abstract: UD C 539. 4 M ic r o s t r u c t u r a l a n d F r a c t u r e A n a ly s i s o f A g e d C a s t D u p le

Cited by 12 publications

References 3 publications

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Effect of Secondary Phase Precipitation on Impact Toughness of Duplex Stainless Steel

Development of High Modulus Ti–Fe–Cu Alloys for Biomedical Applications

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Microstructural and fracture analysis of aged cast duplex steel

Abstract: UD C 539. 4 M ic r o s t r u c t u r a l a n d F r a c t u r e A n a ly s i s o f A g e d C a s t D u p le

Cited by 12 publications

References 3 publications

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Effect of Secondary Phase Precipitation on Impact Toughness of Duplex Stainless Steel

Development of High Modulus Ti&ndash;Fe&ndash;Cu Alloys for Biomedical Applications

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Development of High Modulus Ti–Fe–Cu Alloys for Biomedical Applications