Constitutive modeling of nitrogen-alloyed austenitic stainless steel at low and high strain rates and temperatures

Abed, Farid; Ranganathan, Shivakumar I.; Serry, M. A.

doi:10.1016/j.mechmat.2014.07.007

Cited by 30 publications

(12 citation statements)

References 29 publications

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“…This phenomenon, however, starts disappearing at the higher strain rate (Figure 5b). The DSA phenomenon, which is an occurrence happening when diffusing solute atoms and mobile dislocations that interact in the material [20,21], generally occurs in high strength ferrite and austenite steel at a specific combination of temperatures and strain rates [22].…”

Section: Quasi-static Tests At Room and High Temperaturesmentioning

confidence: 99%

“…One example of physically-based constitutive relationships is the VA model, which was derived based on thermal activation analysis and dislocation interaction mechanisms. The VA model was initially developed to describe the flow stress of pure metals by introducing different equations for different microstructures (i.e., BCC, FCC, and HCP) [17,18,33] and then extended the flow stress for ferrite [19] and austenitic [22] steel as well as titanium alloys [34]. Such models require experimental data at a wide range of temperatures and strain rates to accurately identify its material constants, which are related to the microstructures physical quantities.…”

Section: Flow Stress Description Of En08mentioning

confidence: 99%

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Experimental Study on the Mechanical Behavior of EN08 Steel at Different Temperatures and Strain Rates

Abed

Abdul–Latif

Yehia

2018

Metals

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The objective of this paper is to investigate the mechanical response of EN08 steel at quasi-static and dynamic strain rates. Uniaxial tensile tests under quasi-static regime (from 0.0015 s−1 to 0.15 s−1) are conducted on EN08 steel at a range of temperatures between 298 K and 923 K. Dynamic compression tests are also performed by using a drop hammer and by considering different masses and heights to study the material response at strain rates up to 800 s−1. Through the stress-strain responses of EN08 steel, a strong dependency of the yield stress as well as the ultimate strength on the strain rate and temperature is recognized. Furthermore, the strain hardening is highly affected by the increase of temperature at all levels of strain rate. The microstructure of the steel is also examined at a fracture by using SEM images to quantify the density of microdefects and define the damage evolution by using an energy-based damage model.

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Section: Quasi-static Tests At Room and High Temperaturesmentioning

confidence: 99%

Section: Flow Stress Description Of En08mentioning

confidence: 99%

Experimental Study on the Mechanical Behavior of EN08 Steel at Different Temperatures and Strain Rates

Abed

Abdul–Latif

Yehia

2018

Metals

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“…physics-based taking microstructure evolution into account (Nemat-Nasser et al (1998); Voyiadjis and Almasri (2008); Abed et al (2014); Zhang et al (2015)) and phenomenological that are based on empirical observations (Ramberg and Osgood (1943); Anand (1985); Rusinek et al (2007);…”

Section: Introductionmentioning

confidence: 99%

Experimental characterisation and computational modelling of cyclic viscoplastic behaviour of turbine steel

Rae

Benaarbia

Hughes³

et al. 2019

International Journal of Fatigue

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Fully reversed strain controlled low cycle fatigue and creep-fatigue interaction tests have been performed at ±0.7% strain amplitude and at three different temperatures (400°C, 500°C and 600°C) to investigate the cyclic behaviour of a FV566 martensitic turbine steel. From a material point of view, the hysteresis mechanical responses have demonstrated cyclic hardening at the running-in stage and subsequent, hysteresis cyclic softening during the rest of the material life. The relaxation and energy behaviours have shown a rapid decrease at the very beginning of loading followed by quasi-stabilisation throughout the test. A unified, temperature-and rate-dependent visco-plastic model was then developed and implemented into the Abaqus finite element (FE) code through a user defined subroutine (UMAT). The material parameters in the model were determined via an optimisation procedure based on a genetic solver. The multi-axial form of the constitutive model developed was demonstrated by analysing the thermomechanical responses of an industrial gas turbine rotor subjected to in-service conditions. A sub-modelling technique was used to optimise the FEA. A 2D global model of the rotor with a 3D sub-model of the second stage of the low pressure turbine were then analysed in turn. The complex transient stress and accumulated plastic strain fields were investigated under realistic thermo-mechanical fatigue loading (start-up and shutdown power plant loads). The sub-model was then used for local analysis leading to identification of potential crack initiation sites for the presented types of blade roots.

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“…Unlike most austenitic stainless steels, they are not magnetic when working in cold or sub-zero temperatures [7]. Nitronic 50 exhibits good mechanical properties at low and high temperatures where corrosion resistance and strength are required to be combined and is used extensively in a variety of applications such as naval construction, pumps, fittings, cables and heat exchangers [9].…”

Section: Introductionmentioning

confidence: 99%

Examination of Wear and Rockwell-C adhesion Properties of Nitronic 50 Steel Coated with Pack Boriding Method

Mertgenç

2020

Sakarya University Journal of Science

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The Nitronic 50 steel is a nitrogen containing stainless steel, which has a high corrosion resistance, and high strength but its surface resistance against wear is low, making it extremely limited to use in areas subject to wear. In this study, in order to improve the material surface and to investigate its effect on tribological properties, boronizing process was carried out by used pack boriding method at 850 ° C, 900 ° C and 950 ° C for 4 hours. As a result of coating process, the boride layer has a smooth and flat structure in SEM investigations, the coating thickness varies between 9 µm and 36 µm and the boride layer thickness increases with increasing temperature. While the hardness of the uncoated material was around 250 HV0.05, the surface hardness of the material reached up to 1.712 HV0.05 with the coating process and increased about 7 times. According to XRD analysis, the surface of the coating layer consisted of phases FeB, CrB, Ni3B, Fe2B, Cr2B and MnB. Wear behavior was performed by ball-on-disk wear test in dry environment. The friction coefficient and wear rate decreases with increasing temperature, while the wear resistance is increased by 20 times compared to unboronized sample. When the wear tracks were examined, the uncoated Nitronic 50 had an adhesive wear mechanism, on the other hand the boronized samples had an adhesive and abrasive wear mechanism together. The Rockwell-C adhesion test was carried out under a load of 1.471 N and the resulting surface damages were evaluated according to the quality map. Boronized steel at 850 °C is defined as HF3 type, at 900 °C and 950 °C at boronized steel it is defined as HF4 type and adhesion is acceptable.

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Constitutive modeling of nitrogen-alloyed austenitic stainless steel at low and high strain rates and temperatures

Cited by 30 publications

References 29 publications

Experimental Study on the Mechanical Behavior of EN08 Steel at Different Temperatures and Strain Rates

Experimental Study on the Mechanical Behavior of EN08 Steel at Different Temperatures and Strain Rates

Experimental characterisation and computational modelling of cyclic viscoplastic behaviour of turbine steel

Examination of Wear and Rockwell-C adhesion Properties of Nitronic 50 Steel Coated with Pack Boriding Method

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