scholarly journals Build Strategy and Impact Strength of SLM Produced Maraging Steel (1.2709)

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 51
Author(s):  
Anders E. W. Jarfors ◽  
Akash Chikke Gowda Hosapalya Shashidhar ◽  
Hrushi Kailash Yepur ◽  
Jacob Steggo ◽  
Nils-Eric Andersson ◽  
...  
Keyword(s):  
Impact Strength ◽  
Maraging Steel ◽  
Fracture Behavior ◽  
Power Input ◽  
Impact Testing ◽  
Specific Power ◽  
Powder Bed ◽  
Scan Speed ◽  
Specific Power Input ◽  
The Impact

The current paper aimed to study the impact properties of additively manufactured maraging steel (1.2709) using laser powder bed fusion (PBF-L) processing. The specimens were fabricated using 3D Systems ProX 300 equipment under constant specific power input, or Andrew number. The interactions between the build strategy and parameters such as hatch spacing and scan speed was, and the impact strength and fracture were investigated. The impact energy anisotropy was also investigated in parallel and perpendicular to the build direction. Instrumented impact testing was performed, and the fractography supported that the fusion zone geometry dictated the fracture behavior. The influence from gaseous elements such as nitrogen, oxygen, and hydrogen was found insignificant at the levels found in the printed material.

scholarly journals Build Strategy and Impact Strength of SLM Produced Maraging Steel (1.2709)

2020 ◽  
Author(s):  
Anders E. W. Jarfors ◽  
Akash Chikke Gowda Hosapalya Shashidhar ◽  
Hrushi Kailash Yepur ◽  
Jacob Steggo ◽  
Nils-Eric Andersson ◽  
...  
Keyword(s):  
Impact Strength ◽  
Maraging Steel ◽  
Fracture Behaviour ◽  
Power Input ◽  
Impact Testing ◽  
Specific Power ◽  
Powder Bed ◽  
Scan Speed ◽  
Specific Power Input ◽  
The Impact

The current paper aims to study the impact properties of additively manufactured Maraging steel (1.2709) using laser powder bed fusion (PBF-L) processing. The specimens were manufactured using 3Dsystems ProX 300 equipment under constant specific power input, or Andrew Number. The interactions between the build strategy and parameters, such as Hatch spacing and Scan speed was, and the impact strength and fracture were investigated. The Impact energy anisotropy was also investigated parallel and perpendicular to the build direction. Instrumented impact testing was performed, and the fractography supported that the fusion zone geometry dictated the fracture behaviour. The influence from gaseous elements such as Nitrogen, Oxygen and Hydrogen was found insignificant at the levels found in the printed material.

Thermal Modeling of 304L Stainless Steel for Selective Laser Melting: Laser Power Input Evaluation

2017 ◽  
Author(s):  
Diego Augusto de Moraes ◽  
Aleksander Czekanski
Keyword(s):  
Stainless Steel ◽  
Temperature Distribution ◽  
Selective Laser Melting ◽  
Laser Power ◽  
Laser Scanning ◽  
Power Input ◽  
304L Stainless Steel ◽  
Laser Melting ◽  
Powder Bed ◽  
The Impact

Selective Laser Melting (SLM) process is a Powder Bed Fusion (PBF) technique, which has shown significantly growth in the recent years. The demand for this process is justified by the versatility and ease in manufacturing the parts from 3D models as well for the increased complexity of engineered parts generated from topology or shape optimization. Automotive, aerospace, medical and aviation industries are taking great advantage of this process due the unique geometry characteristics found in the components. To enhance the benefits of SLM, a vital task is to analyze the laser power input impact on the temperature distribution through the powder bed, important for posterior residual stresses analysis. The Finite Element Method proposed in this study is a transient thermal model, able to predict temperature distribution through different sections of the powder bed when performing a single track of the laser scanning. Furthermore, the impact of the laser power input is carried out utilizing SS 304L, a low cost Stainless Steel alloy that can be employed in the SLM process, in order to determine the influence on the temperature distribution along the different cross sections.

The Experiment Study on the Void Fraction in PPG Solution

2012 ◽  
Vol 455-456 ◽  
pp. 815-819
Author(s):  
Qian Qiao Chen ◽  
Qin Zhong ◽  
Li Qi ◽  
Qun Qun Cheng ◽  
Lu Wang ◽  
...  
Keyword(s):  
Gas Phase ◽  
Scale Up ◽  
Power Input ◽  
Gas Holdup ◽  
Specific Power ◽  
Experiment Study ◽  
Operation Parameter ◽  
Polymerization Reactor ◽  
Specific Power Input ◽  
Polyether Polyol

Using the three-layer impellers with big size diameter in an unbaffled elliptic bottom stirred tank，the gas holdup (ε) was studied in the systems of air-polyether polyol (PPG). The results indicate that the gas holdup in the air-PPG system is higher, it increase with the superficial gas phase velocity (Vs) and specific power input (Pm) increase, and decrease as the temperature increase. The influence is severely when the temperature is below 100°C, and is weak above 100 °C.The conclusions give reference for choosing the operation parameter and designing and scale-up of PPG polymerization reactor.

scholarly journals Impact Strength of Austenitic and Ferritic-Austenitic Cr-Ni Stainless Cast Steel in -40 and +20°C Temperature

2014 ◽  
Vol 59 (3) ◽  
pp. 1103-1106
Author(s):  
B. Kalandyk ◽  
R. Zapała ◽  
Ł. Boroń ◽  
M. Solecka
Keyword(s):  
Impact Strength ◽  
Volume Fraction ◽  
Cast Steel ◽  
Testing Machine ◽  
Charpy Impact ◽  
Impact Testing ◽  
Two Phase ◽  
Steel Grades ◽  
Charpy Impact Testing ◽  
The Impact

Abstract Studies described in this paper relate to common grades of cast corrosion resistant Cr-Ni steel with different matrix. The test materials were subjected to heat treatment, which consisted in the solution annealing at 1060°C followed by cooling in water. The conducted investigations, besides the microstructural characteristics of selected cast steel grades, included the evaluation of hardness, toughness (at a temperature of -40 and +20oC) and type of fracture obtained after breaking the specimens on a Charpy impact testing machine. Based on the results of the measured volume fraction of ferrite, it has been found that the content of this phase in cast austenitic steel is 1.9%, while in the two-phase ferritic-austenitic grades it ranges from 50 to 58%. It has been demonstrated that within the scope of conducted studies, the cast steel of an austenitic structure is characterised by higher impact strength than the two-phase ferritic-austenitic (F-A) grade. The changing appearance of the fractures of the specimens reflected the impact strength values obtained in the tested materials. Fractures of the cast austenitic Cr-Ni steel obtained in these studies were of a ductile character, while fractures of the cast ferritic-austenitic grade were mostly of a mixed character with the predominance of brittle phase and well visible cleavage planes.

TESTING METHOD FOR MEASURING IMPACT STRENGTH OF BGA SOLDER JOINTS ON ELECTRONIC PACKAGE

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1050-1055
Author(s):  
TADAHARU ADACHI ◽  
HIROTAKA GOTO ◽  
WAKAKO ARAKI ◽  
TAKAHIRO OMORI ◽  
NORIYASU KAWAMURA ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Impact Strength ◽  
Solder Joints ◽  
Testing Machine ◽  
Load Cell ◽  
Impact Testing ◽  
Circuit Board ◽  
Rear Side ◽  
Electronic Package ◽  
The Impact

A pendulum-impact testing machine was developed to measure the impact strength of ball-grid-array (BGA) solder joints between an electronic package and a circuit board. Ball solders were connected to daisy-chain between a dummy electronic package and a circuit board. The upper side of the package was directly bonded to a load cell. The rear side of the circuit board was also bonded to an aluminum alloy block fixed on a base. A pendulum made of aluminum alloy was collided into the load cell to apply tensile impact to the solder joints through the load cell. The history of the impact load could be controlled by raising the angle of the pendulum. The fracture of a BGA solder joint was detected by measuring the resistance of the daisy-chain circuit on the board. Therefore, the impact strengths of the solder joints at electrical disconnection and mechanical breaking of all joints could be determined. The experimental results showed that this method is useful for measuring the impact strength of BGA solder joints.

Impact Fracture Behavior in Alumina Ceramic Plates

2005 ◽  
Vol 297-300 ◽  
pp. 1327-1332
Author(s):  
Hyung Seop Shin ◽  
Sang Yeob Oh ◽  
Moon Saeng Kim ◽  
Masashi Daimaruya
Keyword(s):  
Fracture Behavior ◽  
Impact Force ◽  
Plate Thickness ◽  
Rear Surface ◽  
Impact Testing ◽  
Low Velocity ◽  
Damage Development ◽  
Apparent Stiffness ◽  
Radial Cracks ◽  
The Impact

In this study, a bar impact test of low velocity was carried out to gain an insight into the damage mechanism and sequence induced in alumina plates during quasi-static impact conditions. An experimental setup which could measure directly the impact force applied to the specimen and supply a compressive pre-stress to the specimen by utilizing an long bar impact was devised. During the bar impact testing, the influence of the pre-stress applied to the specimen along the impact direction on the fracture behavior was investigated. The measured impact force profiles explained well the damage behavior induced in alumina plates. The application of higher pre-stress to the specimen led to less damage due to the suppression of radial cracks which was caused by the increase in the apparent stiffness of the plate. The observed results showed the following sequence in damage development: The development of cone crack at the impact region, the formation of radial cracks from the rear surface of plate depending on the plate thickness, and the occurrence of crushing or fragmentation within the cone envelope.

scholarly journals Evaluation of Dispersion Methods and Mechanical Behaviour of Glass Fibre Composites with Embedded Self-Healing Systems

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1642
Author(s):  
Ionut Sebastian Vintila ◽  
Sorin Draghici ◽  
Horia Alexandru Petrescu ◽  
Alexandru Paraschiv ◽  
Mihaela Raluca Condruz ◽  
...  
Keyword(s):  
Impact Strength ◽  
Thermal Cycling ◽  
Glass Fibre ◽  
Mechanical Behaviour ◽  
Epoxy Matrix ◽  
Impact Testing ◽  
Self Healing ◽  
Dispersion Method ◽  
Fibre Composites ◽  
The Impact

The present paper is focused on evaluating the most suitable dispersion method in the epoxy matrix of two self-healing systems containing dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene (ENB) monomers encapsulated in a urea-formaldehyde (UF) shell, prior to integration, fabrication and impact testing of specimens. Both microstructural analysis and three-point bending tests were performed to evaluate and assess the optimum dispersion method. It was found that ultrasonication damages the microcapsules of both healing systems, thus magnetic stirring was used for the dispersion of both healing systems in the epoxy matrix. Using magnetic dispersion, 5%, 7%, 10%, 12% and 15% volumes of microcapsules were embedded in glass fibre composites. Some of the samples were subjected to thermal cycling between −20 °C and +100 °C for 8 h, to evaluate the behaviour of both healing systems after temperature variation. Impact test results showed that the mechanical behaviour decreases with increasing microcapsule volume, while for specimens subjected to thermal cycling, the impact strength increases with microcapsule volume up to 10%, after which a severe drop in impact strength follows. Retesting after 48 h shows a major drop in mechanical properties in specimens containing 15% MUF-ENB microcapsules, up to total penetration of the specimen.

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