Densification Mechanism of Warm Compaction for Iron-Based Powder Materials

2007 ◽  
pp. 261-264
Author(s):  
Sheng Guan Qu ◽  
Yuan Yuan Li ◽  
Wei Xia ◽  
Wei Ping Chen
Keyword(s):  
Powder Materials ◽  
Densification Mechanism ◽  
Warm Compaction ◽  
Iron Based

Densification Mechanism of Warm Compaction for Iron-Based Powder Materials

2007 ◽  
Vol 534-536 ◽  
pp. 261-264
Author(s):  
Sheng Guan Qu ◽  
Yuan Yuan Li ◽  
Wei Xia ◽  
Wei Ping Chen
Keyword(s):  
Plastic Deformation ◽  
Powder Materials ◽  
Force Component ◽  
Compaction Process ◽  
Densification Mechanism ◽  
Warm Compaction ◽  
Different Temperatures ◽  
Iron Based ◽  
Compaction Processes ◽  
Insight Into

An apparatus measuring changes of various forces directly and continuously was developed by a way of direct touch between powders and transmitting force component, which can be used to study forces state of powders during warm compaction. Using the apparatus, warm compaction processes of iron-based powder materials containing different lubricants at different temperatures were studied. Results show that densification of the powder materials can be divided into four stages, in which powder movement changes from robustness to weakness, while its degree of plastic deformation changes from weakness to robustness. The proposed densification mechanism may provide an insight into understanding of warm compaction process.

scholarly journals Effect of Fullerenes Additions on Physical – Mechanical Properties of Hot-Forged Iron-Based Powder Materials

2021 ◽  
Vol 877 (1) ◽  
pp. 012009
Author(s):  
Mohammed Qasim Kareem ◽  
Vladimir Dorofeyev
Keyword(s):  
Powder Material ◽  
Testing Machine ◽  
Hot Forging ◽  
Hardness Test ◽  
Carbon Steels ◽  
Powder Materials ◽  
Test Machine ◽  
Technological Parameters ◽  
Volume Weight ◽  
Iron Based

Abstract It is possible to expand the applications ranges of powder material products by enhancing the performance properties of these products in addition to their manufacturability and reliability together, it’s possible by materials structures modification. In this paper, the effect of fullerene (C60) additives to iron-based powder material has been studied. All samples produced by Hot-Forging (HF) powder materials technology. Green and HF density of the obtained samples calculated by volume / weight and Archimede’s principle, respectively. The effect of technological parameters on the microstructure of carbon steels’ samples was done by an ALTAMI MET-1M metallographic microscope. Tensile test executed by using of a universal testing machine UMM –5 and the microhardness (HV10) was measured by REICHERT hardness test machine. The results showed that the HF C60 steels’ samples had higher density and strength of 0.81 and 25%, respectively, with a good plasticity in comparison with graphite steels’ samples.

Cavitation resistance of iron-based powder materials

1988 ◽  
Vol 27 (10) ◽  
pp. 805-809
Author(s):  
O. V. Evtushenko ◽  
S. M. Chernega
Keyword(s):  
Powder Materials ◽  
Cavitation Resistance ◽  
Iron Based

Warm Compacting Behavior of Pure Titanium Powders

2011 ◽  
Vol 189-193 ◽  
pp. 2775-2779 ◽  
Author(s):  
Shi Wen He
Keyword(s):  
Pure Titanium ◽  
Compression Force ◽  
Cold Compaction ◽  
Densification Mechanism ◽  
Warm Compaction ◽  
Ejection Force ◽  
Titanium Powders ◽  
Compacting Pressure

Warm compacting behaviors of pure titanium powders were studied. The results show that warm compaction can be applied to titanium powders. The green densities obtained through warm compaction are generally higher than obtained through cold compaction at the same pressure. The optimal warm compacting temperature is about 140 . At the compacting pressure of 500 Mpa, the ejection force of titanium powders through warm compaction is 32.4% lower than through cold compaction. At the same pressure, the effective compression force through warm compaction is bigger than one through cold compaction. In addition, the densification mechanism of warm compaction was discussed.

Preparation of Warm Compacted NbC Reinforced Iron-Based Composite and Its Tribological Behavior

2007 ◽  
Vol 534-536 ◽  
pp. 913-916
Author(s):  
Zhi Yu Xiao ◽  
Tungwai Leo Ngai ◽  
Li Pin Wen ◽  
Yuan Yuan Li
Keyword(s):  
Tribological Behavior ◽  
Combustion Engine ◽  
Wear Behavior ◽  
Engine Oil ◽  
Bench Test ◽  
Mixed Powder ◽  
Severe Wear ◽  
Warm Compaction ◽  
Suitable Material ◽  
Iron Based

A 15 wt.% NbC particulate reinforced iron-based composite was prepared by using warm compaction PM technique. It possesses a high relative density of 98%, a tensile strength of 515 MPa, a hardness of HRC 58 and a remarkable tribological behavior. Warm compaction was used because it can provide compacts with high green density and also increase the formability of the mixed powder. Furthermore, it can provide green strength that is strong enough to handle compacts before sintering. Block on ring tribotester was employed to study the compact’s friction and wear behavior using GCr15 steel as counterpart. A load of 980 N was used. The friction coefficient was 0.085 when the number 20 engine oil as lubricant was used. The results showed that the sintered composite has excellent wear resistivity. This material was then applied in the valve-guide cup of a combustion engine and subject to 500 hour bench test. The cup showed good performance for this test and did not shown any severe wear on the working surface after the test was completed. Therefore, it is a suitable material for parts that are exposed to severe wear condition.

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