scholarly journals Thermomechanical process optimization of U-10wt% Mo – Part 2: The effect of homogenization on the mechanical properties and microstructure

2015 ◽  
Vol 465 ◽  
pp. 710-718 ◽  
Author(s):  
Vineet V. Joshi ◽  
Eric A. Nyberg ◽  
Curt A. Lavender ◽  
Dean Paxton ◽  
Douglas E. Burkes
Keyword(s):  
Mechanical Properties ◽  
Process Optimization ◽  
Thermomechanical Process

scholarly journals A Review on Microstructural Features and Mechanical Properties of Wheels/Rails Cladded by Laser Cladding

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 152
Author(s):  
Xinlin Wang ◽  
Lei Lei ◽  
Han Yu
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Process Optimization ◽  
Laser Cladding ◽  
Future Development ◽  
Heat Affected Zone ◽  
Small Deformation ◽  
Microstructural Characteristics ◽  
Low Input ◽  
Recent Developments

The service life of rails would be remarkably reduced owing to the increase of axle load, which can induce the occurrence of damages such as cracks, collapse, fat edges, etc. Laser cladding, which can enhance the mechanical properties of the rail by creating a coating, has received great attention in the area of the rails due to the attractive advantages such as low input heat, small heat-affected zone, and small deformation. In this paper, recent developments in the microstructural characteristics and mechanical properties of a cladded layer on the rail are reviewed. The method of process optimization for enhancing the properties of a cladded layer are discussed. Finally, the trend of future development is forecasted.

A printability assessment framework for fabricating low variability nickel-niobium parts using laser powder bed fusion additive manufacturing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bing Zhang ◽  
Raiyan Seede ◽  
Austin Whitt ◽  
David Shoukr ◽  
Xueqin Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Uncertainty Quantification ◽  
Process Optimization ◽  
Powder Bed Fusion ◽  
Assessment Framework ◽  
Laser Powder Bed Fusion ◽  
Content Type ◽  
Powder Bed ◽  
Analytical Thermal Model

Purpose There is recent emphasis on designing new materials and alloys specifically for metal additive manufacturing (AM) processes, in contrast to AM of existing alloys that were developed for other traditional manufacturing methods involving considerably different physics. Process optimization to determine processing recipes for newly developed materials is expensive and time-consuming. The purpose of the current work is to use a systematic printability assessment framework developed by the co-authors to determine windows of processing parameters to print defect-free parts from a binary nickel-niobium alloy (NiNb5) using laser powder bed fusion (LPBF) metal AM. Design/methodology/approach The printability assessment framework integrates analytical thermal modeling, uncertainty quantification and experimental characterization to determine processing windows for NiNb5 in an accelerated fashion. Test coupons and mechanical test samples were fabricated on a ProX 200 commercial LPBF system. A series of density, microstructure and mechanical property characterization was conducted to validate the proposed framework. Findings Near fully-dense parts with more than 99% density were successfully printed using the proposed framework. Furthermore, the mechanical properties of as-printed parts showed low variability, good tensile strength of up to 662 MPa and tensile ductility 51% higher than what has been reported in the literature. Originality/value Although many literature studies investigate process optimization for metal AM, there is a lack of a systematic printability assessment framework to determine manufacturing process parameters for newly designed AM materials in an accelerated fashion. Moreover, the majority of existing process optimization approaches involve either time- and cost-intensive experimental campaigns or require the use of proprietary computational materials codes. Through the use of a readily accessible analytical thermal model coupled with statistical calibration and uncertainty quantification techniques, the proposed framework achieves both efficiency and accessibility to the user. Furthermore, this study demonstrates that following this framework results in printed parts with low degrees of variability in their mechanical properties.

scholarly journals Improvement of Mechanical Properties for Poly (L-lactic acid) Film through Drawing Process Optimization

2004 ◽  
Vol 60 (7) ◽  
pp. 230-234 ◽  
Author(s):  
Jun Takagi ◽  
Tomoyuki Nemoto ◽  
Tatsuhiro Takahashi ◽  
Takashi Taniguchi ◽  
Kiyohito Koyama
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Process Optimization ◽  
Drawing Process

Tuning Porosity and Mechanical Properties of Ti6Al4V Alloy Additively Manufactured by SLM

2020 ◽  
Vol 865 ◽  
pp. 1-5
Author(s):  
Michaela Roudnicka ◽  
Jiri Bigas ◽  
Dalibor Vojtech
Keyword(s):  
Mechanical Properties ◽  
Energy Density ◽  
Relative Density ◽  
Process Optimization ◽  
Mechanical Performance ◽  
Microstructural Characterization ◽  
Scanning Speed ◽  
Ti6al4v Alloy ◽  
Machine Material ◽  
Specific Product

Selective laser melting (SLM), as the main representative of additive manufacturing technologies, has a high variability of process parameters setting, which provides wide possibilities in tuning porosity and mechanical properties of final parts. To ensure a high relative density of SLM parts, thorough process optimization is required. Efforts so far developed in this research area suggest that the optimization is desirable for each machine, material and suitably even for a specific product. As even the adjustment of a specific machine may affect the resulting part quality, we carried out an initial process optimization for a specific SLM machine applied to the processing of Ti6Al4V alloy. We studied a range of energy density values between 40-400 J/mm3 by changing scanning speed and hatching distance. The results of this initial optimization demonstrated how porosity and mechanical properties can be varied widely with different parameter settings, suggested a processing window for reaching the highest relative density and revealed that changing the energy density might be also associated with microstructural changes influencing the mechanical performance of a final part. Therefore, our follow-up study will focus on detail microstructural characterization.

Analysis of Process and Properties of Stainless Steel Filament Wrapped Yarn Based on Multi-Axial Ring Spinning

2011 ◽  
Vol 332-334 ◽  
pp. 743-746
Author(s):  
Cheng Liang Deng ◽  
Zhao Qun Du ◽  
Wei Dong Yu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Process Optimization ◽  
Steel Wire ◽  
Ring Spinning ◽  
Excellent Performance ◽  
The Core ◽  
Axial Ring ◽  
Spinning Process ◽  
Core Yarn

A new spinning method was presented to spin three-axial stainless steel filament wrapped yarn by modified ring-spinning, where the stainless steel filament was set as the core yarn and the nylon filament for decoration wrapping the stainless steel filament in the fields of the fabric for Shielding application. A set of process parameters was obtained by the ring spinning frame improvement and spinning process optimization, which realized to spin nylon filament wrapped stainless steel filament yarn. Moreover, the structure, and tensile mechanical properties were measured on the wrapped yarns. The results show that the process can spin stainless steel wire wrapped yarn and acquire the excellent performance of the yarn.

Effect of Recrystallization and Phase Transitions on the Mechanical Properties of Semihard Magnetic FeCo-7.15V Alloy During the Thermomechanical Process

2017 ◽  
Vol 48 (4) ◽  
pp. 1903-1909 ◽  
Author(s):  
Saeed Hasani ◽  
Morteza Shamanian ◽  
Ali Shafyei ◽  
Majid Nezakat ◽  
Hossein Mostaan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transitions ◽  
Thermomechanical Process
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