Property enhancement in Type 316L stainless steel by spray forming

Üçok, I.; Ando, Takao; Grant, N.J.

doi:10.1016/b978-0-444-89107-5.50072-1

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…It is a widely used and studied material in AM processes such as DMLS and SLM (Trelewicz et al , 2016; Zhang et al , 2013; Mertens et al , 2014). Several plastic deformation techniques have been found to strain harden conventionally produced 316L samples improving its material properties (Üçok et al , 1991; Fujiwara et al , 2001; Chen et al , 2005). Chen et al (2005) showed that surface mechanical attrition treatment (SMAT) of 316L stainless steel increased its yield strength by six times that of the traditional untreated material.…”

Section: Introductionmentioning

confidence: 99%

Application of ultrasonic peening during DMLS production of 316L stainless steel and its effect on material behavior

Gale

Achuhan

2017

RPJ

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Purpose Additive manufacturing (AM) processes involve a layer-by-layer sintering of metallic powders to produce fully functional three-dimensional parts. This layer-by-layer building process provides a unique opportunity to enhance mechanical properties by applying treatments that previously were possible only on the surface in traditional manufacturing techniques. The purpose of the study is to examine the effect of ultrasonic peening (UP) applied during a layer-by-layer direct metal laser sintering (DMLS) fabrication of 316L stainless steel on its mechanical properties and microstructure. Design/methodology/approach Uniaxial tensile tests were performed at 1.27 mm/s to determine the effect of UP treatment on the average global behavior of a 316L part, whereas hardness measurements using nanoindentation were performed to determine the modification of local mechanical properties. Compressive buckling tests at a loading rate of 3 mm/min were performed on sample coupons with a large aspect ratio to evaluate the effect of UP on any potential delamination of DMLS layers. Techniques such as optical and scanning electron microscopy (SEM) imaging were utilized to determine the effect of UP on the microstructure. Findings Overall, significant modification in mechanical properties such as hardness and yield strength, along with microstructure, was observed. Large increases in both the average global and local mechanical properties, as well as a disruption in the columnar grain microstructure, was observed in DMLS parts treated with UP treatment. Originality/value Results indicate an opportunity for UP to be used as an in-situ process during AM processes for dynamically altering the mechanical behavior, microstructure, and distortion due to residual stress formation, in a tunable fashion.

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Section: Introductionmentioning

confidence: 99%

Application of ultrasonic peening during DMLS production of 316L stainless steel and its effect on material behavior

Gale

Achuhan

2017

RPJ

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“…It is well known that martensitic transformation can be induced under plastic deformation at low temperatures in many austenitic stainless steels [32][33][34][35]. Seetharaman and Krishnan [36] reported, in 316 SS, a considerable amount of martensite (around 30% vol.%) formed under ~30% true strain uniaxial tension and rolling at -196 °C.…”

Section: Hierarchical Microstructure Evolution Under Different Strainmentioning

confidence: 99%

Hierarchical evolution and thermal stability of microstructure with deformation twins in 316 stainless steel

Wang

Jozaghi

Караман

et al. 2017

Materials Science and Engineering: A

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We report extensive nano-twin formation in 316 stainless steel (SS) and the evolution of a hierarchical microstructure through the formation of multi-scale twin bundles after uniaxial tension with uniform elongation levels of 20%, 30%, and 40%. Multiscale characterization techniques were employed to reveal the nature of these twins. The twin density increases with the increasing strain level, however, the twin width remains the same, notably reducing the mean free path of dislocations. Concurrently, significant work hardening is observed during subsequent deformation. The deformation-induced nano-twins are thermally stable up to ~800 ºC, shown by both interrupted and in-situ transmission electron microscopy experiments, above which the recrystallization takes place in the vicinity of the twins. Such favorable thermal stability of the twins in nano-twin strengthened 316 SS offers a promising approach for microstructurally engineering these materials for potential applications at elevated temperatures. The related strengthening mechanisms are discussed in the light of the mean free path of dislocations and the dislocation interactions with twin boundaries.

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“…However, application of this material is hindered by its low mechanical strength and poor anti‐friction properties. Strengthening of austenitic stainless steels has drawn much attention in the past decades and various approaches have been developed, such as varying its chemical compositions to induce solid solution hardening [1, 2] or grain refinement [3–5].…”

Section: Introductionmentioning

confidence: 99%

Localisation Phenomenon Investigation on SMATed Stainless Steel Samples by Speckle Interferometry

Petit¹,

Montay²,

François³

2011

Strain

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In‐plane Electronic Speckle Pattern Interferometry (ESPI) has been successfully used during tensile tests on SMA‐treated (Surface Mechanical Attrition Treatment) and as‐received 316L stainless steel in order to measure the strain rate field. The heterogeneity in the strain rate field can be observed from a stage of deformation which doesn’t coincide with the classic Considère’s criterion (dF = 0) for the diffuse neck initiation (or plastic instability). The initiation of this heterogeneity strongly depends on treatments undergone by the material. In this paper, a comparison was performed about the heterogeneity initiation of specimens SMATed during 30 min with 2 mm shot, 3 mm shot and a non‐treated sample. The formation of the two slip band system until fracture of the tensile specimen was also studied.

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Property enhancement in Type 316L stainless steel by spray forming

Cited by 6 publications

References 3 publications

Application of ultrasonic peening during DMLS production of 316L stainless steel and its effect on material behavior

Application of ultrasonic peening during DMLS production of 316L stainless steel and its effect on material behavior

Hierarchical evolution and thermal stability of microstructure with deformation twins in 316 stainless steel

Localisation Phenomenon Investigation on SMATed Stainless Steel Samples by Speckle Interferometry

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