Microstructure, Hardness, and Wear Resistance of Powder-Injection-Molded Products of Fe-Based Metamorphic Powders

2007 ◽  
Vol 26-28 ◽  
pp. 355-358
Author(s):  
Chang Kyu Kim ◽  
Chang Young Son ◽  
Dae Jin Ha ◽  
Tae Sik Yoon ◽  
Sung Hak Lee
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Thermally Stable ◽  
Austenitic Matrix ◽  
Amorphous Phases ◽  
Injection Molded

Powder injection molding (PIM) process was applied to Fe-based metamorphic alloy powders, and microstructure, hardness, and wear resistance of the PIM products were analyzed and compared with those of conventional PIM stainless steel products. When Fe-based metamorphic powders were injection-molded and then sintered at 1200 oC, completely densified products with almost no pores were obtained. They contained 34 vol.% of (Cr,Fe)2B borides dispersed in the austenitic matrix without amorphous phases. Since these (Cr,Fe)2B borides were very hard and thermally stable, hardness, and wear resistance of the PIM products of Fe-based metamorphic powders were twice as high as those of conventional PIM stainless steel products. Such property improvement suggested new applicability of the PIM products of Fe-based metamorphic powders to structures and parts requiring excellent mechanical properties.

Powder Injection Molding of Cu-Based Amorphous Powders and Fe-Based Metamorphic Powders

2008 ◽  
Author(s):  
Chang-Young Son ◽  
Chang Kyu Kim ◽  
Dae Jin Ha ◽  
Tae Shik Yoon ◽  
Sunghak Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Injection Molding ◽  
Volume Fraction ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Austenitic Matrix ◽  
Amorphous Phases ◽  
Amorphous Powders ◽  
Injection Molded

Powder injection molding (PIM) process was applied to Cu-based amorphous alloy powders and Fe-based metamorphic alloy powders, and microstructure, hardness, and wear resistance of the PIM products were analyzed. When Cu-based amorphous powders were injection-molded and sintered at 470 °C, sintering was not made since most of amorphous phases were replaced by crystalline phases. When sintered at higher temperatures, volume fraction of pores inside the sintered specimens decreased, but sintering was not properly conducted. When Fe-based metamorphic powders were injection-molded and then sintered at 1200 °C, completely densified products with almost no pores were obtained. They contained 34 vol.% of (Cr, Fe)2B borides dispersed in the austenitic matrix without amorphous phases. Since these (Cr, Fe)2B borides were hard and thermally stable, hardness, high-temperature hardness, and wear resistance of the PIM products of Fe-based metamorphic powders were twice as high as those of conventional PIM stainless steel products. These findings suggested new applicability of the PIM products of Fe-based metamorphic powders to structures and parts requiring excellent mechanical properties.

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).

scholarly journals Environmentally Efficient 316L Stainless Steel Feedstocks for Powder Injection Molding

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1296
Author(s):  
Berenika Hausnerova ◽  
Martin Novak
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Mass Production ◽  
316L Stainless Steel ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
The Novel ◽  
Efficiency Enhancement ◽  
Optimum Conditions ◽  
Set Up

In this study, environmentally convenient highly metal powder filled feedstocks intended for powder injection molding is presented. The composition of 60 vol % 316L stainless steel gas atomized powder feedstocks containing semicrystalline waxes: acrawax or carnauba wax and paraffin wax, combined with polyethylene glycol and modifier, was optimized to provide defect-free parts. Rheological as well as thermogravimetric analyses supported with scanning electron microscopy and metallography were employed to set up optimum conditions for molding, debinding and sintering. The performance of the novel feedstock was compared with currently available polyolefines-based materials, and results showed an efficiency enhancement due to the substantially lower (about 100 °C) mixing and molding temperatures as well as a reduction of debinding and sintering times at the simultaneous achievement of better mechanical properties in terms of elongation and tensile strength, in comparison to the mass production feedstock.

scholarly journals Processing of Stainless Steel (SS316L)-Hydroxyapatite (HA) Powder Composite through Powder Injection Molding

2019 ◽  
Vol 1198 (4) ◽  
pp. 042017
Author(s):  
Mohd Ikram Ramli ◽  
Abu Bakar Sulong ◽  
Norhamidi Muhamad ◽  
Andanastuti Muchtar ◽  
Amir Arifin ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Powder Injection Molding ◽  
Powder Composite ◽  
Powder Injection

Corrosion and Cytotoxicity Evaluation of AISI 316L Stainless Steel Produced by Powder Injection Molding (PIM) Technology

2005 ◽  
Vol 498-499 ◽  
pp. 86-92 ◽  
Author(s):  
Isolda Costa ◽  
Sizue Ota Rogero ◽  
Olandir Vercino Correa ◽  
Clarice Terui Kunioshi ◽  
Mitiko Saiki
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
316L Stainless Steel ◽  
Electrochemical Techniques ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Cytotoxicity Test ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel

This study investigates the in vitro corrosion and cytotoxicity response of AISI 316L stainless steel produced by powder injection molding (PIM) technology in a solution that simulates physiological fluids (MEM) by electrochemical techniques and neutral red uptake cytotoxicity assay. The results were compared with those of AISI 316L produced by conventional metallurgy. Both steels showed high corrosion resistance and no toxic effect in the cytotoxicity test. The corrosion products were analyzed by instrumental neutron activation analysis (INAA). The surfaces of the alloys were evaluated before and after corrosion test by scanning electron microscopy and a passive behaviour was indicated supporting the results from other techniques.

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