Critical aspects of sinter-hardening of prealloyed Cr–Mo steel

Hatami, Sepehr; Malakizadi, Amir; Nyborg, Lars; Wallin, Daniel

doi:10.1016/j.jmatprotec.2010.03.002

Cited by 27 publications

(19 citation statements)

References 20 publications

(29 reference statements)

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“…Ignoring copper percentage, increasing carbon content has adverse effect on M s . This microstructure is agreed by many researchers [21,26,27].…”

Section: Microstructure Investigationsupporting

confidence: 87%

“…3 presents the CCT diagrams for Astaloy CrA + 0.5 wt.% C. The major influence of chromium is actually on the eutectoid composition rather than eutectoid temperature. In general, all alloying elements improve hardenability; however, Mo, C and Cr are highly influential [26,27]. Chromium significantly lowers carbon content, and at 1.8 wt.% Cr the eutectoid content is approximately 0.45 wt.% C. Upper this condition, driving forces for cementite formation should increase.…”

Section: Microstructure Investigationmentioning

confidence: 98%

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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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“…Ignoring copper percentage, increasing carbon content has adverse effect on M s . This microstructure is agreed by many researchers [21,26,27].…”

Section: Microstructure Investigationsupporting

confidence: 87%

Section: Microstructure Investigationmentioning

confidence: 98%

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

2014

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“…Warke et al [21] reported that the pores are energetically favorable ferrite nucleation sites for phase transformation from austenite, presumably stimulating ferrite formation with decreasing density in this study. Furthermore, carbon atoms that segregate on the energetically unstable free surface [28] may also accelerate ferrite formation for samples with higher porosities (i.e., lower densities) [29].…”

Section: Resultsmentioning

confidence: 99%

Complex effects of alloy composition and porosity on the phase transformations and mechanical properties of powder metallurgy steels

et al. 2015

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“…In addition, Mo has a synergistic effect with Ni. In the presence of Ni levels above 0.75%, Mo contributes to an increase in approximately 25% more hardenability [10][11][12]. Recently commercialised sinter-hardenable Cr-Si-Ni-Mo based PM steel, Ancorsteel 4300, was engineered to simulate wrought steel compositions and counteract the oxygenrelated problems that are associated with Cr and Si.…”

Section: Introductionmentioning

confidence: 99%