Load rate influence on the fracture morphology of a ductile steel

Drar, H.; Bergmark, Åke

doi:10.1016/0013-7944(93)90283-x

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…According to definition [2], in PM parts cracks are nucleate and initiate from surface pores under different static (tensile) and dynamic loading (fatigue). This has been confirmed by several researchers [32,37,38]. Likewise, in this research the examination of fracture surfaces revealed that in many cases initiation sites are constituted by pores located a few microns below the tensile surface, as shown in Fig.…”

Section: Mode I: Crack Initiation and Propagationsupporting

confidence: 64%

“…6. Particle fracture, which can occur when bonding between the matrix and inclusion is strong, can accelerate the development of crack growth [32,37]. In addition, elongated pores create condition for crack growth more easily in a tensile surface.…”

Section: Mode I: Crack Initiation and Propagationmentioning

confidence: 99%

“…Several models have been proposed [13,32,37] to describe cleavage fracture. It is summarized in the following stages: under an external load, micro cracks are nucleated ahead of a dislocation pile-up and they grow through the grain of the respective particle.…”

Section: Mode Ii: Fracture Mechanismmentioning

confidence: 99%

“…Solubility of copper with increasing carbon content [29]. oxides) [32]. Stress distribution and local strain around pores, cause local deformation, nucleation and crack growth [2,11,[33][34][35][36].…”

Section: Mode I: Crack Initiation and Propagationmentioning

confidence: 99%

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Microstructural association between mechanical behavior with bending fracture surfaces in Astaloy CrA sintered parts alloyed by Cu and C

2014

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a b s t r a c tApplication of powder metallurgy technique, a method presenting both economic and technical concepts for producing sintered parts, has been expanding in automobile and other engineering industries. Powder metallurgy parts usually possess residual porosity in their microstructures deteriorating mechanical performance. There have been many solutions to increasing of strength in these parts such as applying different heat treatment or adding alloying elements. It is well known that Fe-Cu-C is the one of main alloying system for both increasing the strength and decreasing cost of them. In this study, the microstructure, mechanical properties (transverse rapture strength and hardness), crack behavior and fracture modes of a low alloy Fe-Cr powder (Astaloy CrA) with different amount of copper (0, 1 and 2 wt.%) and carbon, in form of graphite (0.45, 0.6 and 0.8 wt.%) sintered at conventional condition have been investigated. Microstructural evolution showed adding copper and graphite as alloying elements could generate widespread of strength (857-1380 MPa) and hardness . Developing different phases in microstructure was the main reason for various mechanical properties. Crack coalescence phenomenon leads to fracturing with ductile (at sinter-necks) and brittle morphology. Micro-mechanism of fracture related to transparticle and interparticle crack propagation.

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Section: Mode I: Crack Initiation and Propagationsupporting

confidence: 64%

Section: Mode I: Crack Initiation and Propagationmentioning

confidence: 99%

Section: Mode Ii: Fracture Mechanismmentioning

confidence: 99%

Section: Mode I: Crack Initiation and Propagationmentioning

confidence: 99%

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Microstructural association between mechanical behavior with bending fracture surfaces in Astaloy CrA sintered parts alloyed by Cu and C

2014

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“…(9), vary as the rate of the applied loading increases. This assumption can be justified by observing that, in metallic materials, the micro-mechanisms resulting in the formation of the fracture surface are seen to change as the rate of the applied loading increases, this resulting in a variation of the morphology of the fracture surface itself [37][38][39][40]. As recalled above, according to the TCD's m odus operandi, the size of the process zone depends mainly on the characteristics of those processes resulting in the final fracture [20].…”

mentioning

confidence: 99%