Thermomechanically processed powder metallurgy Ti-5Fe alloy: effect of microstructure, texture, Fe partitioning and residual porosity on tensile and fatigue behaviour

Materialia ◽  
2021 ◽  
pp. 101254
Author(s):  
Carlos Romero ◽  
Fei Yang ◽  
Stella Raynova ◽  
Leandro Bolzoni
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Behaviour ◽  
Residual Porosity ◽  
Alloy Effect ◽  
Effect Of Microstructure

Effect of microstructure on fatigue behaviour of cast Al–7Si–Mg alloy

2001 ◽  
Vol 17 (4) ◽  
pp. 446-450 ◽  
Author(s):  
G. Atxaga ◽  
A. Pelayo ◽  
A.M. Irisarri
Keyword(s):  
Fatigue Behaviour ◽  
Mg Alloy ◽  
Effect Of Microstructure

Synthesis of powder metallurgy Ti-3Fe-2Al alloy using high-frequency induction heating

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040031
Author(s):  
Stella Raynova ◽  
Khaled Alsharedah ◽  
Fei Yang ◽  
Leandro Bolzoni
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Induction Heating ◽  
High Frequency ◽  
High Efficiency ◽  
High Vacuum ◽  
Residual Porosity ◽  
Effect Of Temperature ◽  
Vacuum Furnace ◽  
High Frequency Induction

A powder metallurgy approach was applied for the synthesis of an [Formula: see text] Ti-2Al-3Fe alloy. Blends of the elemental Ti, Al and Fe powders were compacted and subsequently sintered. High-frequency induction heating (HFIH) instead of conventional high-vacuum furnace heating was used for the sintering, due to its high efficiency. The effect of temperature on the level of densification, residual porosity and mechanical properties was studied. Electron dispersive spectrum analysis was used to study the dissolution and homogenization of the alloying elements. The results showed that a short induction sintering (IS) cycle in the range of 10–15 min is sufficient to achieve significant powder consolidation, evident by the increase of the density and mechanical properties. The residual porosity diminishes with the increase of the sintering temperature. Full dissolution of the alloying powders is completed after sintering at temperatures above those of [Formula: see text]- to [Formula: see text]-phase transformation.

Effects of Hot Repressing on Fatigue Behaviour of Powder Metallurgy, Normalized Fe–O·3C Steels

1987 ◽  
Vol 30 (2) ◽  
pp. 125-132 ◽  
Author(s):  
I. J. Mellanby ◽  
J. R. Moon ◽  
E. R. Leheup
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Behaviour

Gigacycle Fatigue Behaviour of Sintered WC-Co Hardmetals Investigated by Ultrasonic Resonance Testing

2015 ◽  
Vol 825-826 ◽  
pp. 1016-1023
Author(s):  
Agnieszka Betzwar Kotas ◽  
Brigitte Weiss ◽  
Herbert Danninger
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Limit ◽  
Fatigue Testing ◽  
Fatigue Behaviour ◽  
Horizontal Branch ◽  
Loading Cycle ◽  
Tool Materials ◽  
Ultrasonic Resonance ◽  
Ultrasonic Fatigue ◽  
Percussion Drilling

Hardmetals, manufactured from powders by pressing and sintering, are the most important tool materials in service today. In many applications, such as milling or percussion drilling, they are subjected to fatigue with considerable loading cycle numbers. In the present study, the fatigue behaviour of hardmetals in push-pull loading was investigated up to Nmax= 1010using ultrasonic resonance fatigue testing. It showed that with all hardmetal grades investigated there is no fatigue “limit”, i.e. a horizontal branch of the S-N curve, but a consistent drop of the curve up to maximum N. Crack initiation was found to occur predominantly microstructure-controlled, as compared to defect controlled as typical for powder metallurgy tool steels.Keywords: gigacycle fatigue, WC-Co hardmetals, ultrasonic fatigue testing, fatigue limit

The effect of microstructure on creep behavior of a powder metallurgy (PM) beta gamma alloy

2012 ◽  
Vol 26 (7) ◽  
pp. 2009-2013
Author(s):  
D. Y. Seo ◽  
T. Sawatzky ◽  
H. Saari ◽  
D. J. Kim ◽  
P. Au ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Creep Behavior ◽  
Effect Of Microstructure

The Effect of Microstructure Heterogeneity on Fatigue Property of Powder Metallurgy Steels

2008 ◽  
Vol 273-276 ◽  
pp. 348-353 ◽  
Author(s):  
H. Abdoos ◽  
H. Khorsand ◽  
A.R. Shahani ◽  
M. Arjomandi
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Behavior ◽  
Local Stress ◽  
Fatigue Property ◽  
Fatigue Performance ◽  
Loading Mode ◽  
Stress Risers ◽  
High Fatigue ◽  
Different Response ◽  
Effect Of Microstructure

Powder metallurgy is a new method for mass production of precision components with appropriate mechanical properties, but in this kind of materials (PM parts) with special microstructures (pores act as local stress risers), fracture due to fatigue is expected as an important destructive factor. Various microstructures in powder metallurgy steels, depending on alloying methods, have different response against cyclic loading. diffusion bonding is an effective method to obtain high fatigue performance in PM steels. The main characteristic of this materials consists of well-organized phases distribution due to incomplete diffusion of alloying elements. In this study fatigue behavior of diffusion-bonded, distaloy AE, steel with two carbon contents under different periodic loading are investigated. The effect of carbon content and various loading mode upon fatigue performance is analyzed. Metallugraphy and fractography examination on fatigue loaded samples revealed the positive effect of microstructure heterogeneity on fatigue crack behavior and this concept is a reason for increasing of diffusion-bonded powders application to manufacturing of components that are subjected to cyclic stresses.

scholarly journals Fatigue Behaviour and Crack Initiation in CoCrFeNiMn High-Entropy Alloy Processed by Powder Metallurgy

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1110 ◽  
Author(s):  
Zdeněk Chlup ◽  
Stanislava Fintová ◽  
Hynek Hadraba ◽  
Ivo Kuběna ◽  
Monika Vilémová ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Cyclic Loading ◽  
Crack Nucleation ◽  
Milled Powder ◽  
Fatigue Behaviour ◽  
Initiation Site ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Fine Grained ◽  
Small Change

Single-phase equiatomic five-element high entropy alloy CoCrFeMnNi was prepared by powder metallurgy. Two materials with ultra-fine-grained microstructure were prepared by spark plasma sintering (SPS) of ball-milled powder at two sintering times (5 and 10 min), assigned as HEA 5 and HEA 10, respectively. Basic microstructural and mechanical properties were evaluated. The median grain size of the microstructures was determined to be 0.4 and 0.6 μm for HEA 5 and HEA 10, respectively. The differences in the microstructure led to a significant change in strength and deformation characteristics evaluated at room temperature. The effect of cyclic loading was monitored by three-point bending fatigue test. The results show that even relatively small change in the microstructure causes a significant effect on fatigue life. The fatigue endurance limit was measured to be 1100 MPa and 1000 MPa for HEA 5 and HEA 10, respectively. The detailed fractographic analysis revealed that abnormally large grains, localised in the microstructure on the tensile loaded surface, were a typical fatigue initiation site. The formation of (nano) twins together with dislocation slips caused the crack nucleation because of the cyclic loading.

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