Use of instrumented indentation testing to study local mechanical properties of 304L SS welded joints subjected to low-cycle fatigue loadings

Ye, Duyi; Feng, Mei; Liu, Jianzhong; Xu, Yuandong; Chen, Yinzheng; Liu, Xiao

doi:10.1016/j.msea.2012.11.077

Cited by 23 publications

(9 citation statements)

References 21 publications

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“…[17][18][19] The 3 most common techniques to extract material properties from instrumented indentation data are the representative strain method, [20,21] iterative FEA, [19,22] and artificial neural networks (ANN). [23] The ANN technique is beyond the scope of this paper and will not be discussed.…”

Section: B Phase Transformation Behavior and Weld Propertiesmentioning

confidence: 99%

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Raath

Norman

McGregor

et al. 2018

Metall Mater Trans A

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Boron steel, classed as an ultra high-strength steel (UHSS), has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. UHSS spot welds exhibit unique hardness distributions, with a hard nugget and outlying base material, but with a soft heat-affected zone in-between these regions. This soft zone reduces the strength of the weld and makes it susceptible to failure. Due to the interaction of various weld zones that occurs during loading, there is a need to characterize the loading response of the weld for accurate failure predictions. The loading response of certain weld zones, as well as failure loci, was obtained through physical simulation of the welding process. The results showed a significant difference in mechanical behavior through the weld length. An important result is that instrumented indentation was shown to be a valid, quantitative method for verifying the accuracy with which weld microstructure has been recreated with regard to the target weld microstructure.

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Section: B Phase Transformation Behavior and Weld Propertiesmentioning

confidence: 99%

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Raath

Norman

McGregor

et al. 2018

Metall Mater Trans A

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“…Numerous reviews addressing the fundamental principles of contact mechanics upon which the technique of instrumentation indentation is based have been published in addition to reviews exploring the applications of instrumented indention [33][34][35][36][37][38][39][40][41][42].…”

Section: Instrumented Indentionmentioning

confidence: 99%

“…Therefore, the application of instrumented indention allows for the elastic and plastic contribution to indention to be measured. This allows for the material to be characterised in terms of its elasto-plastic properties and was cited by several authors as an ideal method to characterise microstructures of steels and weld areas [40][41][42]. This is especially important when quantifying the susceptibility of a weld to HACC, as crack propagation is dependent on the elasto-plastic properties of the material within which a crack has initiated [43].…”

Section: Instrumented Indentionmentioning

confidence: 99%

Micromechanical characterisation of weld metal susceptibility to hydrogen-assisted cold cracking using instrumented indentation

2016

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Hydrogen-assisted cold cracking is generally accepted to be the consequence of a critical concentration of hydrogen trapped within a susceptible microstructure and subjected to a threshold level of stress. Traditionally, hardness has been used as a proxy for establishing the critical limits above which the risk of a hydrogen crack propagating is considered significant. However, developments in the steel-making process, in particular thermomechanically controlled processing, has brought into question the suitability of empirical hardness limits developed using older generation steels. In this paper, a safe welding boundary was established for single-pass root runs for API 5 L X70 steel welded with E6010 electrodes. Across this boundary, it was shown that hydrogen cracks were present in welds with hardness's well below the traditionally accepted threshold of 350 HV. This paper explores the use of nanoindentation as means of quantifying the susceptibility of welds deposited on high-strength low-alloy steels, using shielded metal arc welding, to hydrogen-assisted cold cracking. It is suggested that the use of the hardness/elastic modulus (H/E) ratio, which is directly related to the yield strength of a material, is a more suitable parameter to predict weld metal hydrogen-assisted cold cracking (HACC) susceptibility than is the hardness alone.

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“…LCF has two fundamental characteristics, including low cycle phenomenon and plastic deformation in each cycle, in which the materials have finite endurance for this type of load. There is a lot of interest in investigating the influences of cyclic loading on the mechanical properties of the material, especially steel [13][14][15][16][17][18][19][20]. Srinivasan et al [13] investigated the LCF behavior at several temperatures of 316L stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Characterization of strain amplitude-dependent behavior of hardness and indentation size effect of SS400 structural steel

Vinh

Anh

Thang

2020

STCE

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In this paper, the continuous stiffness measurement (CSM) indentation is employed to investigate fatigue mechanical properties of structural steel under cyclic loading. For this purpose, several representative analytical approaches were introduced to estimate the basic mechanical properties including Young’s modulus and indentation hardness from the characteristics of the loading/unloading curves. Several experiments including CSM nanoindentation, low-cycle fatigue experiment for four strain amplitude levels, optical microscope (OM), and transmission electron microscopy (TEM) examinations were conducted to observe the variation characteristics of mechanical properties at the microscale and their micro-mechanisms. The microstructural evolution of the specimens deformed by the low-cycle fatigue was observed using the OM and TEM examinations. The standard nanoindentation experiments were then performed at different strain rate levels to characterize the influences of strain rate indentation on hardness of the material. The micro-mechanisms established based on the microstructural evolution and strain gradient plasticity theory were introduced to be responsible for the variation of indentation hardness under cyclic loading. Finally, the indentation size effect (ISE) phenomenon in SS400 structural steel was investigated and explained through the strain gradient plasticity theory regarding geometrically necessary dislocations underneath the indenter tip. The experimental results can be used for practical designs as well as for understanding the fatigue behavior of SS400 structural steel. Keywords: cyclic loading; fatigue; nanoindentation; indentation size effect; strain rate sensitivity; structural steel.

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Use of instrumented indentation testing to study local mechanical properties of 304L SS welded joints subjected to low-cycle fatigue loadings

Cited by 23 publications

References 21 publications

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Micromechanical characterisation of weld metal susceptibility to hydrogen-assisted cold cracking using instrumented indentation

Characterization of strain amplitude-dependent behavior of hardness and indentation size effect of SS400 structural steel

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