Effect of LCF on behavior and microstructure of microalloyed HSLA steel and its simulated CGHAZ

Aleksić, Vujadin; Milović, Ljubica; Blačić, Ivo; Vuherer, Tomaž; Bulatovic, Srdjan M.

doi:10.1016/j.engfailanal.2019.06.017

Cited by 21 publications

(5 citation statements)

References 16 publications

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“…The inner and outer ring structures of the specimen did not separate after the failure at a relatively small amplitude but instead squeezed each other. The test material showed cyclic softening behavior after the first round of strengthening, which was similar to the results from previous tensile fatigue tests on steel 24–27 . In the strain control cycle experiment with R = −1, the maximum stress point was located at the point where the strain direction first became negative, but the positive and negative maximum stress curves showed high consistency after several cycles.…”

Section: Experimental Results and Analysissupporting

confidence: 85%

Low cycle fatigue performance of DP900 steel under cyclic shear paths

Zhang

Yue

et al. 2021

Fatigue Fract Eng Mat Struct

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In this study, a sheet fatigue shear test device is designed and applied to the low‐cycle fatigue testing of DP900 with varying strain amplitudes within the range of 0.5%–6.0%. The microstructure is analyzed by using electron backscatter diffraction, and fracture surfaces are examined via scanning electron microscopy. Results indicate that the material exhibits cyclic softening behavior after the first two cycles of hardening, with a stable softening rate and a high damage evolution rate related to loading amplitude. The variation of the hysteresis curve in the cyclic process is shown. Total plastic strain energy absorbed increases as loading amplitude decreases and it reaches the peak at approximately 1%. The life prediction model based on plastic strain energy density and strain amplitude is verified to be suitable for the cyclic shear path. The influence of microinhomogeneity on the distribution of stress and strain, especially the deformation of martensite, is closely related to the bi‐linear region of fatigue life curve.

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Section: Experimental Results and Analysissupporting

confidence: 85%

Low cycle fatigue performance of DP900 steel under cyclic shear paths

Zhang

Yue

et al. 2021

Fatigue Fract Eng Mat Struct

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“…Many researchers have reported the mechanical properties of the HAZ, including stress‐strain relations, 10,11 toughness, 12,13 creep, 14 S‐N curves, 15–18 and fatigue crack propagation behaviour 19,20 . To characterize the mechanical properties of the HAZ, specimens are usually machined at the most informative position in actual welded joints.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…However, the volume of fatigue data obtained using thermally simulated HAZ specimens of this type remains very small 16,18 . For example, low‐cycle fatigue behaviour has been reported for very few specimens 18 . Although the tensile strength dependency of HAZ fatigue strength has been reported from only two types of simulated HAZ specimen data, 16 fatigue data for a wide range of microstructures are necessary to enable a detailed evaluation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of microstructure of simulated heat‐affected zone on low‐ to high‐cycle fatigue properties of low‐carbon steels

Nishikawa

Furuya

Igi³

et al. 2020

Fatigue Fract Eng Mat Struct

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To clarify the effect of microstructural changes on the fatigue property of the weld heat-affected zone (HAZ), low-to high-cycle fatigue tests were conducted on 16 types of simulated HAZ specimens that had been prepared using thermal processes. The results showed the fatigue S-N curves of the HAZ to be widely scattered as a function of strength level. These fatigue data were divided into two groups: coarse grain (CG) and fine grain (FG) HAZ, when strain amplitude was used to represent S-N curves. The fatigue data for the CGHAZ group showed a relatively short fatigue life. Based on surface observations, the initiated fatigue crack size of CGHAZ was larger than that of FGHAZ as a function of microstructural unit size. Hence, fatigue crack growth life, which is almost the same as total fatigue life of CGHAZ, decreased. K E Y W O R D Sfatigue, heat affected zone, low-carbon steel, welding

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“…Ship structures are most commonly being produced by welding. For this reason high strength low-alloy (HSLA) steels, besides high strength as the main properties, should also have exceptional plasticity, adequate toughness and high resistance to brittle damage, as well as adequate workability and good welding performance [3]. The ability of forming is an additional important metal characteristic, and for steels with high strength, the weldability is of special implication.…”

Section: Introductionmentioning

confidence: 99%

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2021

brod

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Brittle damages have been examined widely since welding became common practice when it comes to carrying out robust structures. Welded structure of the ship hull has to be continuous. Brittle damages that occur on hull structures have always been examined thoroughly. Cracks are most commonly initiated at locations where stress concentrators exist. These concentrators can originate due to flaws that occur during the design phase or due to mistakes that occur during the assembly of the structure. When it comes to failures and damages that occur at ship structures, it has been noticed that damages due to brittleness practically always happen at low temperatures.Impact test analysis is significant due to the fact that it replicates the ductile to brittle transition of steel in practically identical range of temperatures for all ship structures. Impact of ductile-brittle transition temperature is an important factor especially because there have been many ship failures and damages in history.In ship structures made of welded joints of high strength low-alloy (HSLA) steels with their segments (parent metal, weld metal and heat-affected-zone), the toughness test determines the tendency of steel to brittle fracture, respectively the tendency to increase brittleness during exploitation. Parameters obtained by testing the properties of plasticity are the fundamental for the composition of ship structures with the aim of realize strengths under tested load.The test results of high strength low-alloy steel toughness assessment at different test temperatures show that temperature significantly affects the impact toughness of steels and their alloys.

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Effect of LCF on behavior and microstructure of microalloyed HSLA steel and its simulated CGHAZ

Cited by 21 publications

References 16 publications

Low cycle fatigue performance of DP900 steel under cyclic shear paths

Low cycle fatigue performance of DP900 steel under cyclic shear paths

Effect of microstructure of simulated heat‐affected zone on low‐ to high‐cycle fatigue properties of low‐carbon steels

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