Tribological Properties of 316L Stainless Steel Fabricated via Metal Injection Molding

2014 ◽  
Vol 879 ◽  
pp. 134-138 ◽  
Author(s):  
Nurazilah Mohd Zainon ◽  
Noorsyakirah Abdullah ◽  
Norazlan Roslani ◽  
Mohd Afian Omar
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Tribological Properties ◽  
316L Stainless Steel ◽  
Chromium Steel ◽  
Metal Injection Molding ◽  
Dog Bone ◽  
Injection Molded ◽  
Pin On Disk ◽  
Sliding Distance

The tribological properties of sintered 316L stainless steel fabricated via injection molding were investigated. Tests were carried out at room temperature comparing metal injection molded dog bone tensile samples at different sintering temperatures. The parameter used for the pin on disk test is a 10kN load, 500m sliding distance and a chromium steel ball as a sliding partner. The morphologies and compositions of the worn surfaces were analyzed by SEM, Raman and XPS. The results showed that the wear mechanism and friction coefficient of SS316L depended strongly on the microstructure which was influenced by the sintering temperature.

The Characterization and Flow Behavior of 316L Stainless Steel Feedstock for Micro Metal Injection Molding (μMIM)

2010 ◽  
Vol 44-47 ◽  
pp. 2872-2876
Author(s):  
Pei Li Haw ◽  
Norhamidi Muhamad ◽  
Hadi Murthadha
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
316L Stainless Steel ◽  
Flow Behavior ◽  
Palm Stearin ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Binder System ◽  
Molding Process ◽  
Rheological Characterization

The rheological behaviors of the Micro Metal Injection Molding feedstock are important for the stability of the feedstock during micro injection molding process and quality of the final micro-components. Homogeneous feedstocks are preferable for MIM process to ensure the dimensional consistency of molded components and prevent the defects of powder-binder separation or particle segregation. In this work, feedstocks with various formulations of 316L stainless steel and binder system were prepared by using Brabender Plastograph EC Plus mixer. The binder system comprises of palm stearin, polyethelene (PE) and stearic acid. In order to obtain the viscosity, activation energy, flow behavior and mold ability index, the rheological characterization of the feedstocks were investigated in numerous conditions by using Shimadzu 500-D capillary rheometer The study showed that all of the 316L stainless steel feedstocks are homogenous with pseudo-plastic behaviors.

Simulation and Modeling of Sintering Process for 316L Stainless Steel Metal Injection Molding Parts

2015 ◽  
Vol 651-653 ◽  
pp. 32-37
Author(s):  
Mohamed Sahli ◽  
Jean Claude Gelin ◽  
Thierry Barrière
Keyword(s):  
Experimental Data ◽  
Stainless Steel ◽  
Injection Molding ◽  
316L Stainless Steel ◽  
Structural Evolution ◽  
Metal Injection Molding ◽  
Sintering Process ◽  
Polymer Injection ◽  
Finite Element Software ◽  
Large Material

The metal injection molding (MIM) process allows the manufacturing of small and very complex metallic components. The metal injection molding processing combines the shaping capability of polymer injection molding with the large material variety of metals and ceramics. This paper discusses in detail the development of a numerical model capable of simulating micro-structural evolution and macroscopic deformation during sintering of complex powder compacts. A sintering model based on elastic–viscoplastic constitutive equations was proposed and the corresponding parameters such as bulk viscosity, shearing viscosity and sintering stress were identified from dilatometer experimental data. The constitutive model was then implemented into finite element software in order to perform the simulation of the sintering process. The numerical simulation methods being compared against results of the sintering experiments. The experimental data were obtained from sintering of 316L stainless steel powders.

Investigations on Metal Injection Molding of 316L Stainless Steel

1995 ◽  
Vol 10 (3) ◽  
pp. 425-438 ◽  
Author(s):  
G. Veltl ◽  
Th. Hartwig ◽  
F. Petzoldt ◽  
H.-D. Kunze
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
316L Stainless Steel ◽  
Metal Injection Molding

Role of Debinding to Control Mechanical Properties of Powder Injection Molded 316L Stainless Steel

2013 ◽  
Vol 699 ◽  
pp. 875-882 ◽  
Author(s):  
Muhammad Rafi Raza ◽  
Faiz Ahmad ◽  
M.A. Omar ◽  
R.M. German ◽  
Ali S. Muhsan
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Injection Molding ◽  
316L Stainless Steel ◽  
Low Cost ◽  
Microstructural Analysis ◽  
Powder Injection ◽  
Laboratory Furnace ◽  
Injection Molded

316L stainless steel is widely used in various industries due to low cost, ease of availability and exceptional combination of mechanical properties along with corrosion resistance as compared to the other available metal alloys. In powder injection molding, debinding is very critical step and improper debinding can change the final properties dramatically. In the present study, affects of debinding on mechanical properties of powder injection molded 316L stainless steel were studied. The prepared feedstocks were molded according to MPIF 50 standard using vertical injection molding machine (KSA100). The plastic binder was removed at 450°C from the molded test samples using two different furnaces i.e. commercial and laboratory furnace followed by the sintering in vacuum, hydrogen, mixture of H2 and N2 (9:1) and nitrogen at 1325°C for 2hr with post sintering cooling rate 3°C/min . Test samples debound in commercially available furnace showed 97% densification and higher mechanical properties. The corrosion resistance was reduced due to presence of residual carbon during thermal debinding. The presence of carbon and formation of carbides and nitrides were confirmed by XRD and microstructural analysis. The results showed that the test samples debound in commercial furnace showed brittle behavior due to the presence of carbides and nitrides. Test samples sintered in N2 showed 96.3% density and tensile strength 751MPa. This value of strength is twice as compared to the sample debound in laboratory furnace followed by the sintering in vacuum. The achieved mechanical properties in vacuum sintered samples were comparable to the wrought 316L stainless steel (according to ASTM standard).

Preparing MIM Feedstocks for Bio-Applications Using an Agar-Based Binder

2008 ◽  
Vol 587-588 ◽  
pp. 385-389 ◽  
Author(s):  
Fatima M. Barreiros ◽  
A.G. Martins ◽  
Mariana Matos ◽  
João M.G. Mascarenhas ◽  
M. Teresa Vieira
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Grain Growth ◽  
316L Stainless Steel ◽  
Metal Injection Molding ◽  
Metal Powders ◽  
Torque Rheometry ◽  
Good Sinter ◽  
Solids Content ◽  
Powder Content

The present study aims to prepare feedstocks for MIM (Metal Injection Molding) where the metal powders are 316L stainless steel powders (SS). The master objective is to compare the performance of a biodegradable binder with a commercial one based on polyolefins. Different challenges must be overcome in SS injection molding, as follows: to decrease binder/carbon content in feedstocks; to decrease carbon contamination during debinding and sintering; to avoid the formation of chromium carbide and presence of precipitation-free zones; to avoid the grain growth during sintering and to reduce the feedstock price. The optimization of the feedstocks was performed using a torque rheometry technique. Feedstocks of coated and uncoated SS powders mixed with an agar-based binder were used to produce sound parts. A feedstock constituted by SS powders mixed with a high quality commercial binder was the standard. SS with agar-based on feedstocks can admit solids content similar to those based on the commercial binder (62 vol.%). For similar powder content, the sinters resulting from feedstocks with the agar-based binder shows a lower quantity of solid solution of carbon and chromium carbides, absence of precipitation-free zones than commercial feedstocks and good sinter soundness. Coating powders with nanocrystalline stainless steel contribute to control grain growth during debinding and sintering.

Tribology Properties of Injection Moulded Co Based Alloy

2016 ◽  
Vol 1133 ◽  
pp. 285-289
Author(s):  
Nurazilah Mohd Zainon ◽  
Noorsyakirah Abdulah ◽  
Norazlan Roslani ◽  
Rosliza Sauti ◽  
Mohd Afian Omar ◽  
...  
Keyword(s):  
Room Temperature ◽  
Hip Prosthesis ◽  
Sintering Temperature ◽  
Chromium Steel ◽  
Cocrmo Alloy ◽  
Metallic Biomaterials ◽  
Dog Bone ◽  
Pin On Disk ◽  
Sliding Distance ◽  
Disk Test

CoCrMo alloy is one of the most used metallic biomaterials due to its high wear. Premature wear of the component is one of the main cause of hip prosthesis failure. The objective in this study is to investigate the tribology properties of sintered CoCrMo fabricated via injection moulding. Tests were carried out at room temperature comparing metal injection moulded dog bone tensile samples at different sintering temperatures. The parameter used for the pin on disk test is a 10kN load, 500m sliding distance and a chromium steel ball as a sliding partner. The morphologies and compositions of the worn surfaces were analysed by optical and scanning electron microscope. The results showed that the wear mechanism and friction coefficient of CoCrMo depended strongly on the microstructure which was influenced by the sintering temperature.

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