Mechanical properties and microstructural characterization of simulated heat-affected zones in 10 wt pct Ni steel

Barrick, Erin J.; DuPont, J. N.

doi:10.1016/j.msea.2019.01.085

Cited by 17 publications

(8 citation statements)

References 42 publications

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“…All samples for heat treatment were cut from a plate that was hot rolled to a thickness of 25 mm and air-cooled to room temperature. A three-stage QLT heat treatment identified in the literature for this steel [37][38][39][40][41][42][43][44] was performed and included: (i) An austenitizing step at 800°C for 1 hour followed by water quenching (the Q step in QLT) (ii) Tempering at 650°C for 40 min followed by water quenching to room temperature (the L step in QLT) (iii) A second tempering at 590°C for 1 hour followed by a final water quench (the T step in QLT).…”

Section: Methodsmentioning

confidence: 99%

“…[18,29,30,32] One such steel that has drawn recent attention is an Fe-10Ni-1.0Mo-0.6Mn-0.6Cr-0.08V-0.1C (wt pct) steel (hereafter referred to as the ''10Ni steel'' for brevity) that has been variously heat-treated including a twostage temper called the quench-lamellerize-temper (QLT) treatment. [36][37][38][39][40][41][42][43][44] In this QLT condition, this steel has been shown to have high quasi-static strength and toughness as well as superior ballistic resistance. [37] The QLT treatment on the 10Ni steel produces a dispersion of fine, Ni-rich, thermally stable austenite precipitates in a ferritic matrix [37,40] ; it is thought that the high quasi-static toughness and the resistance to shear localization during dynamic deformation are related to the mechanical instability of this precipitated austenite.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution in an Fe-10Ni-0.1C Steel During Heat Treatment and High Strain-Rate Deformation

Harding

Mouton

Gault

et al. 2020

Metall Mater Trans A

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1C (wt pct) steel in a multi-step heat-treated condition called 'QLT' is understood by tracking its evolution in each step using transmission electron microscopy (TEM) and atom probe tomography; further, the consequence of high strain-rate deformation on the site-specific change in the QLT microstructure is examined by microdiffraction and energy dispersive spectroscopy in the TEM. The QLT treatment results in two generations of austenite (arising from the Land the T-step) with differing Ni content. The primary focus of this study is on the thermal and mechanical stability of the precipitated austenite and the influence of austenite chemistry and size on the stability. Kolsky bar compression experiments were conducted to isolate a situation where an adiabatic shear band propagated partway through the specimen. Examination of the microstructure in such a specimen showed both generations of austenite to be present far from the shear band, ahead of the shear band and adjacent to the shear band. The austenite immediately ahead of the shear band was fragmented. Within the shear band, evidence was found for deformation-induced transformation to martensite. These findings are discussed within the context of improved damage tolerance and ballistic resistance observed earlier in field tests.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution in an Fe-10Ni-0.1C Steel During Heat Treatment and High Strain-Rate Deformation

Harding

Mouton

Gault

et al. 2020

Metall Mater Trans A

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“…5) Several studies related to maximizing the welded joint strength have been carried out in recent years. [6][7][8][9][10][11][12] Various welding processes have been used for several applications, especially to obtain steel products with high mechanical strength. However, achieving flash welded joints with such desired mechanical properties is challenging.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

2020

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The entrapment of inclusions in the solidified weld zone is detrimental to its mechanical properties. In an AC flash welding process, the upsetting rate, the initial temperature of the weld pool, and the size of inclusions may affect the final distribution of the inclusions. Additionally, the concentration of sulfur may induce Marangoni convection in the weld pool, which possibly affects the pushing and engulfment of inclusions by the solid at the solid-liquid interface. In the present work, a two-dimensional numerical model based on Computational Fluid Dynamics (CFD) has been developed to investigate the behavior of alumina inclusions during the AC flash welding of a thin SPFH590 steel plate. The Volume of Fluid (VOF) numerical model was coupled with the dynamic mesh model for the motion of plates, discrete phase for inclusion particles and solidification model. The simulation results show that the upsetting parameters significantly affect the overall inclusion motion. A high upsetting rate pushes the inclusions away from the welded joint. The high initial flash temperature does not affect the removal of inclusions from the weld zone. A similar outcome has been noted with respect to the increase in the diameter of the inclusions. Furthermore, the predicted results show that inclusions are prone to engulfment by the solidification front under the influence of higher interfacial tension between the inclusions and melt. Nevertheless, the inclusion displacement under the influence of an interfacial tension gradient is diminutive because of the rapid solidification rate of the weld pool.

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“…Friction welding, which is one of the rare welding methods that can be applied to similar materials, has become popular in recent years and many studies have been done on this subject in recent years [8,9]. Microstructures of specimens produced by friction welding are examined in detail in [10][11][12][13]. In [14][15][16][17][18] various applications related to friction welding have been studied.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

2020

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In recent years, with the development of welding methods, using these methods in manufacturing industry and in advanced engineering has become more popular. In this study, mechanical properties of rods obtained by friction welding and electric arc welding are compared. Hence, three specimens with different material properties are manufactured, two of which are welded by friction welding and one of which is welded by electric arc welding. These three specimens are adapted to the ASTM E8-04 standard with the help of a universal lathe. Moreover, the tensile stress values and the elasticity modulus of all these specimens are obtained as a result of tensile tests. Accordingly, the effects of the type of welding and material properties used in manufacturing on the mechanical behavior of the specimens are examined. In addition, specimens taken from the cracked surfaces of the pieces broken from the specimens as a result of the tensile test are examined with SEM (scanning electron microscopy). These examinations reveal the microstructure of the specimens. The elemental distribution data obtained as a result of examinations with SEM and the mechanical property data obtained as a result of tensile tests support each other. Furthermore, effects of a heat affected zone (HAZ) on the mechanical properties of the rod are investigated as a functionally graded material.

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Mechanical properties and microstructural characterization of simulated heat-affected zones in 10 wt pct Ni steel

Cited by 17 publications

References 42 publications

Microstructural Evolution in an Fe-10Ni-0.1C Steel During Heat Treatment and High Strain-Rate Deformation

Microstructural Evolution in an Fe-10Ni-0.1C Steel During Heat Treatment and High Strain-Rate Deformation

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

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Mechanical properties and microstructural characterization of simulated heat-affected zones in 10 wt pct Ni steel

Cited by 17 publications

References 42 publications

Microstructural Evolution in an Fe-10Ni-0.1C Steel During Heat Treatment and High Strain-Rate Deformation

Microstructural Evolution in an Fe-10Ni-0.1C Steel During Heat Treatment and High Strain-Rate Deformation

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

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Mechanical properties and microstructural characterization of simulated heat-affected zones in 10 wt pct Ni steel