Determination of mechanical properties in SM490 steel weld zone using nanoindentation and FE analysis

Pham, Thai‐Hoan; Kim, Seung-Eock

doi:10.1016/j.jcsr.2015.08.014

Cited by 33 publications

(16 citation statements)

References 29 publications

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“…It can be seen from this figure that both loading curvature and applied load of the indentation curves in the BM are lowest and these parameters are highest in the WM among three regions. This observation consists with the available results of indentation responses for the weld zone of other structural steels [3,6,22] and corresponds to the lowest hardness and yield strength in BM among three regions, respectively, which will be discussed below. While the hardness can be directly extracted from indentation curve P-h, the yield strength in the regions of the weld zone was determined using Eqs.…”

Section: Indentation Responsementioning

confidence: 71%

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Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Pham

Vinh

Tung

2019

STCE

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In this study, instrumented indentation testing was conducted at room temperature for the investigation of the effect of strain rate on the hardness and yield strength in the weld zone of a commonly used structural steel, SM520. A number of indentation tests were undertaken at a number of strain rate values from 0.02 s −1 to 0.2 s −1 in the weld metal (WM), heat-affected zone (HAZ), and base metal (BM) regions of the weld zone. The mechanical properties including yield strength (σ y ) and hardness (H) in WM, HAZ, and BM were then computed from the applied load-penetration depth curves using a proposed method. As the result, the effects of strain rate indentation on yield strength and hardness in all regions of the weld zone were evaluated. The results displayed that hardness and yield strength in the weld zone's components are influenced on the strain rate, where both hardness and yield strength decrease with the decreasing strain rate.

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Section: Indentation Responsementioning

confidence: 71%

“…The α value of the weld zones can be obtained with the aid of FE analysis of indentation by correlating the experimental with the simulated load-depth curves. The details of the procedure for determination of the yield strength in the weld zones from the proposed method and FE analysis can be found in the previous work [22].…”

Section: Methodsmentioning

confidence: 99%

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Pham

Vinh

Tung

2019

STCE

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“…At macroscale, some interesting findings, in this direction, have been reported, substantiating the validity of the microindentation technique for the assessment of the microhardness variation along the weld line of the macrosized PS and PC parts [13][14][15]. The same concept was applied to the assessment of welded joints in several polymers and metals [16][17][18]. It should be noted, however, that to the best of the authors' knowledge, no research has been reported regarding the implementation of the nanoindentation technique for the assessment of the mechanical properties at the weld line locations of micromolded parts.…”

Section: Introductionmentioning

confidence: 81%

Mechanical testing of micromolded plastic parts by nanoindentation

Zhiltsova

Daga

Frontini

et al. 2017

Polymer Engineering & Sci

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Weld lines occur when two melt streams are combined. They may result in purely cosmetic imperfections, but also may represent part failure if placed in an area on the plastic highly subjected to stress during service. Qualitative assessment of these structural and cosmetics defects is usually accomplished by conventional mechanical characterization, destructive by nature, such as tensile testing or dynamic mechanical analysis (DMA). Nanoindentation offers the possibility for quick quasi‐nondestructive in situ testing, allowing for monitoring the changes that occur in the surface layer of a plastic micropart. In this study, a methodology for the assessment of the superficial properties: hardness (H) and reduced Young's modulus (Er) of micromolded parts was developed. The microparts, molded from Polyoxymethylene with two different sets of processing conditions were tested throughout the entire length and in the vicinity of the welding line. The observed hardness (H) and reduced Young's modulus (Er) suggest that there is a steady increase in both values along the weld line from the adjoining flow front point at the inner side of the micropart towards the outer edge. In addition, H and Er were found out to vary consistently with the alterations induced by the processing conditions. POLYM. ENG. SCI., 58:609–614, 2018. © 2017 Society of Plastics Engineers

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“…An improved FCG model (iLAPS) directly by correlating uniaxial tensile properties with cyclic plastic response was employed to predict the FCG rate . The local stress‐strain responses of welded joints were obtained by the nanoindentation test . Then, a novel method to predict the FCG rate of microdomain joint materials was proposed by combining iLAPS model with a nanoindentation technique.…”

Section: Introductionmentioning

confidence: 99%

“…34,35 The local stressstrain responses of welded joints were obtained by the nanoindentation test. [36][37][38] Then, a novel method to predict the FCG rate of microdomain joint materials was proposed by combining iLAPS model with a nanoindentation technique. These detailed studies on the MAG welded G20Mn5 steel might serve as a vital reference when designing and manufacturing the bogie frame of new-generation metro vehicles.…”

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confidence: 99%

The microstructure, mechanical, and fatigue behaviours of MAG welded G20Mn5 cast steel

Qin

Branco

et al. 2020

Fatigue Fract Eng Mat Struct

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The microstructure, mechanical strength, and fatigue response of metal active gas (MAG) butt‐welded G20Mn5 cast steel was thoroughly investigated for exploring the service safety and reliability of new‐generation railway bogie frames. The fatigue properties of the matrix and welded joints were determined by both low‐ and high‐cycle service regimes. On the basis of nanoindentation testing, the fatigue crack growth (FCG) was derived by correlating with cyclic plastic response of microdomain materials across the MAG joint. The results show that the MAG induces considerable changes in microstructures and hardness of the G20Mn5 matrix and resultantly produces an overmatching welded joint but show comparatively low‐ and high‐cycle fatigue properties to as‐received material. The calculated threshold FCG range based on the Murakami model indicates that the maximum 1.5‐mm defect might be the cracking site subjected to fatigue loading from the structural integrity viewpoint.

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Determination of mechanical properties in SM490 steel weld zone using nanoindentation and FE analysis

Cited by 33 publications

References 29 publications

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Mechanical testing of micromolded plastic parts by nanoindentation

The microstructure, mechanical, and fatigue behaviours of MAG welded G20Mn5 cast steel

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