Reliability of mechanical properties of induction sintered iron based powder metal parts

2014 ◽  
Vol 53 ◽  
pp. 383-397 ◽  
Author(s):  
Can Çivi ◽  
Necati Tahralı ◽  
Enver Atik
Keyword(s):  
Mechanical Properties ◽  
Powder Metal ◽  
Sintered Iron ◽  
Metal Parts ◽  
Iron Based

scholarly journals Mechanical properties and hardness results of the medium frequency induction sintered iron based powder metal bushings

2014 ◽  
Vol 46 (2) ◽  
pp. 195-203 ◽  
Author(s):  
U. Çavdar ◽  
E. Atik ◽  
A. Ataç
Keyword(s):  
Mechanical Properties ◽  
Heating System ◽  
Sintering Process ◽  
Powder Metal ◽  
Medium Frequency ◽  
Sintered Iron ◽  
Conventional Sintering ◽  
Density Values ◽  
Iron Based ◽  
Sintering Method

In this study; iron based powder metal (PM) bushing compacts were sintered via medium frequency induction heating system. Iron based powders were mixed with 2 wt.% copper (Cu), 0.3 wt.% carbon (C) and 1 wt.% zinc stearat (Zn-st) via V-Type mixer. PM compacts were sintered by 2 different sintering processes. One of them was conventional sintering method other was medium frequency induction sintering method. In conventional sintering process, PM bushing compacts were sintered under inert environmental at 1120?C for 30 minutes. In medium frequency induction sintering process, PM bushing compacts were sintered between 30-50 kHz frequency (Medium frequency) at 2 kW, 1120?C for 1 or 3 minutes under atmospheric environmental. Mechanical properties, densities and micro hardness? were investigated for all sintered processes. SEM and micro structural images were taken from polished broken surface of the sintered PM bushing compacts. 3 minutes induction sintered compacts were reached the compressive strength, microhardness and density values of the conventional sintered PM bushing compact.

Investigation of Conventional- and Induction-Sintered Iron and Iron-Based Powder Metal Compacts

JOM ◽  
2014 ◽  
Vol 66 (6) ◽  
pp. 1027-1034 ◽  
Author(s):  
Uğur Çavdar ◽  
Enver Atik
Keyword(s):  
Powder Metal ◽  
Sintered Iron ◽  
Iron Based

Influence of the Pore Characteristics on Mechanical Properties and Abrasive Wear of Sintered Iron-Based Alloys Subjected to a Thermochemical Treatment

2017 ◽  
Vol 1143 ◽  
pp. 97-102 ◽  
Author(s):  
Mihaela Marin ◽  
Florentina Potecaşu ◽  
Octavian Potecaşu ◽  
Florin Bogdan Marin
Keyword(s):  
Mechanical Properties ◽  
Abrasive Wear ◽  
Fluidized Bed ◽  
Thermochemical Treatment ◽  
Microstructural Characterization ◽  
Zinc Stearate ◽  
Microstructural Characteristics ◽  
Pore Characteristics ◽  
Sintered Iron ◽  
Iron Based

The aim of this paper is to analyse the effect of the pore morphology on microstructural characteristics, mechanical properties and abrasive wear resistance of iron-based alloys subjected to a thermochemical treatment as carburizing in fluidized bed. The starting materials studied in this paper are represented by pre-alloyed iron base powder obtained by powder metallurgy (P/M) route. The powders were produced by water atomization with different particle sizes (< 45, 45-63, 63-100, 100-150, >150 μm). The raw powders have been mixed with 1% zinc stearate as lubricant and uniaxially compacted into cylindrical specimens at room temperature at 600 MPa. The disc dimensions are 8 6 mm. The green compacts were sintered at 1.150 °C for 90 minutes in a laboratory furnnace. After sintering, a thermochemical treatment was applied. The parameters for the carburizinng in fluidized bed are: temperature of 930 °C and time of 45 minutes. The microstructural characterization was carried out using optical microscopy. The porosity of studied samples were analyzed acording to their microstructural characteristics and chemical composition. The mechanical properties and abrasive wear of the sintered and thermochemical treated samples were evaluated. A correlation between porosity, mechanical properties and abrasive wear was established.

Effect of Porosity Content on the Weldability of Powder Metal Parts Produced by Friction Stir Welding

2007 ◽  
Vol 534-536 ◽  
pp. 789-792 ◽  
Author(s):  
Adem Kurt ◽  
Ilyas Uygur ◽  
Hakan Ates
Keyword(s):  
Friction Stir Welding ◽  
Powder Metal ◽  
Aluminum Powders ◽  
Friction Stir ◽  
Metal Parts ◽  
Constant Friction ◽  
Sintered Powder ◽  
Hardness Values ◽  
Welding Technique ◽  
Traveling Speed

Friction stir welding technique (FSW) has many advantages in terms of tool design, rotational speed and traveling speed, and can be adjusted in a precise manner. It enables heat input into the system to be controlled. In this study, Aluminum powders were compacted at 350,400 and 450 MPa pressure and sintered at 450 oC temperature for 30 minutes in Ar atmosphere. Sintered powder metal parts were joined to each other by FSW at the speed of 1800 rpm and traveling welding speed 200 mm/min under a constant friction force. The results show that the amount of porosity affects the weldability of powder metallurgy (P/M) parts. Furthermore, the porosity and microstructural evolution of the Aluminum also affected the hardness values of the tested materials.

Heat Treatment Effects on Static and Dynamic Mechanical Properties of Sintered SINT D30 Powder Metal

2013 ◽  
Vol 592-593 ◽  
pp. 643-646 ◽  
Author(s):  
Marko Šori ◽  
Tomaž Verlak ◽  
Srečko Glodež
Keyword(s):  
Mechanical Properties ◽  
Complex Geometry ◽  
Low Cost ◽  
Surface Hardness ◽  
Load Ratio ◽  
Tensile Tests ◽  
Test Machine ◽  
Strain Diagram ◽  
Powder Metal ◽  
Sintered Steel

Low cost, low material waste and good accuracy in components with complex geometry are the main reasons for powder metallurgy to be considered as a promising manufacturing process for the future. Like wrought steel, sintered steel can also be heat treated to increase surface hardness and to improve strength. This paper compares mechanical properties of the hardened sintered steel with the sintered steel of the same powder metal SINT D30. Firstly, the static strength of both samples is determined by quasi-static tensile tests. Results are compared in stress strain diagram and they show that the tensile strength of the hardened sintered steel SINT D30 can surpass 700 MPa. The main focus of this study is however fatigue behaviour of the sintered steel. Both sets of samples are tested on a pulsating test machine with the load ratio of R = 0. The first sample is subjected to a load that corresponds to 90 % of the yield strength and is then gradually lowered to achieve one million stress cycles without breakage. Obtained results are then presented as Wöhler curves and compared in S-N diagram.

Diffusion-alloying sintering of Cr–Mo pre-alloyed iron powders with carbon: The effect of the carbon introduction method on the sinter’s properties

2021 ◽  
Vol 112 (1) ◽  
pp. 48-56
Author(s):  
Lubomir Anestiev ◽  
Jordan Georgiev ◽  
Seryozha Valkanov ◽  
Marcela Selecká ◽  
Sabine Cherneva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dissolution Rate ◽  
Reasonable Assumption ◽  
Micro Structure ◽  
Iron Powders ◽  
Base Powder ◽  
Alloyed Iron ◽  
Iron Based

Abstract The influence of the carbon introduction method on the microstructure and the mechanical properties of sinters produced from iron-based powders by diffusion-alloying sintering has been studied. Two methods of carbon introduction were tested: (1) Premixing of the base powder with graphite, and (2) Coating of the base powder with a carbon-containing substance. The results obtained could be summarized as (1) The microstructure and the mechanical properties depend on the method of carbon introduction; (2) The sinters produced from coated powders possess finer micro-structure, improved homogeneity, and in two out of three of the studied compositions, better mechanical properties. Based on the results obtained, a reasonable assumption was made that the method of carbon introduction affects the dissolution rate of the carbon additive, thus affecting the micro-structure and the mechanical properties of the sinter.

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