Effect of carbon and phosphorus addition on sintered density and effect of carbon removal on mechanical properties of high density sintered steel

Khraisat, Walid; Nyborg, Lars

doi:10.1179/026708304225017210

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…Detailed information on our dynamic experiments can be found in [14]. (1) The crack growth rate from the threshold region through the stable crack growth region to the unstable breakage was investigated on specimens shown in Fig. 2b with a height of 10 mm, which were cut out from sintered rounds using wire electric discharge machining (WEDM).…”

Section: Figurementioning

confidence: 99%

“…The main reasons are low costs, good accuracy, smooth surfaces, satisfactory performance, and low waste of raw materials. However, during the production process, many variables affect the final mechanical properties of a PM steel component, which are mainly dependent on final density [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The main factors are not only the obvious theoretical density of the base powder and compaction pressure but also the amount and type of alloying elements, sintering time, temperature and atmosphere, the cooling rate after sintering and also additional treatment after sintering [1][2][3]. Nevertheless, cold compacted PM materials are always porous to a certain degree, and the pores in PM material are critical areas where crack nucleation usually occurs [4].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue and fracture parameters of diffusion alloyed Cu–Ni–Mo sintered steel

Šori

Vuherer

Glodež

2016

Engineering Fracture Mechanics

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue and fracture parameters of diffusion alloyed Cu–Ni–Mo sintered steel

Šori

Vuherer

Glodež

2016

Engineering Fracture Mechanics

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“…El análisis de las mezclas sinterizadas a 1.150 °C, permite establecer que el contenido de boro óptimo está situado en 0,5 % y que su efecto sobre la densidad es mayor debido al alto contenido de cromo y la presencia de carbono, el cual, también mejora la sinterización en fase líquida por la formación de líquido adicional [26] . Es sabido que el cromo estabiliza la fase α del hierro, en la que la difusividad volumétrica del boro a 910 °C es 300 veces mayor que en la fase γ.…”

Section: 3 D De En Ns Si Id Da Ad Dunclassified

Effect of boron on sintering of a ferritic stainless steel

Miramontes¹,

Barceinas-Sánchez²,

Vélez-Jacobo³

et al. 2008

Rev. metal.

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E Ef fe ec ct to o d de el l b bo or ro o e en n l la a s si in nt te er ri iz za ac ci ió ón n d de e u un n a ac ce er ro o i in no ox xi id da ab bl le e f fe er rr rí ít ti ic co o ( (• •) ) J.A. Cabral-Miramontes * , J.D.O. Barceinas-Sánchez ** , L. Vélez-Jacobo ** ,A. Martínez-Villafañe * y J.G. Chacón-Nava * R Re es su um me en n En este trabajo se analiza el efecto del boro sobre la densidad del acero inoxidable ferrítico 409Nb en el proceso de sinterización. La finalidad de adicionar boro es promover la formación de una fase líquida durante la sinterización, a una temperatura por debajo de 1.200 °C. Las adiciones de boro variaron entre 0,0 y 1,5 % en peso. Las muestras se compactaron a 700 MPa y las sinterizaciones se realizaron a 1.075 y 1.150 o C, durante 60 min en una atmósfera de hidró-geno, calentando a una velocidad de 20 o C/min. La densidad se determinó por el método de Arquímedes y las muestras se analizaron en el microscopio electrónico de barrido. Este trabajo muestra la dependencia de la densidad del acero y morfología de la microestructura, en función del contenido de boro y la temperatura de sinterización. P Pa al la ab br ra as s c cl la av ve eAcero inoxidable ferrítico; Boro; Fase líquida; Pulvimetalurgia. Sinterización.E Ef ff fe ec ct t o of f b bo or ro on n o on n s si in nt te er ri in ng g o of f a a f fe er rr ri it ti ic c s st ta ai in nl le es ss s s st te ee el l A Ab bs st tr ra ac ct tThis work studies the effect of boron on the density of a 409Nb ferritic stainless steel obtained by powder metallurg during the process of sintering. The purpose of adding boron is to promote the formation of a liquid phase during sintering at temperatures below 1200 °C. The boron contents varied from 0.0 to 1.5%wt. Specimens were compacted at 700MPa, and sintering was made at 1075 and 1150 o C during 60 minutes under a hydrogen atmosphere, using a heating rate of 20 o C/min. Density values were determined by the Archimedes method, and the samples were analyzed using scanning electron microscopy. This work shows the dependence of the steel density and morphology of the microestructure as a function of boron content and the temperature of sintering. K Ke ey yb bo oa ar rd ds s . I IN NT TR RO OD DU UC CC CI IÓ ÓN NLos aceros inoxidables ferríticos manufacturados por pulvimetalurgia se utilizan en aplicaciones donde se requiere comportamiento magnético, buena conductividad térmica y alta resistencia a la fatiga en ciclos tér-micos [1] . La etapa más importante del proceso, para estos aceros, es la sinterización, la cual es algo más compleja que para otros materiales, debido a que existe una delgada capa de óxido de cromo en la superficie de las partículas que impide tener un buen contacto entre éstas evitando, con esto, la densificación de las piezas [2] . Muchos metales requieren protección contra la oxidación, ya que los óxidos y otros contaminantes obstaculizan la difusión en las uniones y el desarrollo de propiedades adecuadas [1][2][3][4][5] . Atmósferas adecuadas de sinterización remueve...

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“…Sintering in the two-phase field has been described to be particularly beneficial for the mechanical properties [16]. Furthermore, Belma Üregen, Christian Gierl-Mayer, Herbert Danninger: Technische Universität Wien, Institut für Chemische Technologien und Analytik, Getreidemarkt 9/164, A-1060 Wien, Austria, e-mail: herbert.danninger@tuwien.ac.at  P forms a transient liquid phase with Fe due to the low temperature of the Fe-P eutectic of only about 1050°C [17,18], at least at higher heating rates [19], which also accelerates sintering [20], the effect of P thus also depending on the heating rate applied [21,22]. In industrial practice, addition of P as an activator to PM steels is popular because it enables sintering in standard mesh belt furnaces, at temperatures of about 1120ºC, resulting in properties that in the case of P-free steels, would require temperatures exceeding 1200°C and thus more expensive walking beam furnaces.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus in Sintered Steels: Effect of Phosphorus Content and P Carrier in Sintered Steel Fe-C-P

Üregen

Gierl‐Mayer

Danninger

2016

Powder Metallurgy Progress

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Phosphorus as an alloy element is quite common in powder metallurgy, the contents industrially used being markedly higher than those present in wrought steels. In this study, the influence of phosphorus addition through different P carriers was investigated. PM steels of the type Fe-0.7%C-x%P (x = 0.0 … 0.8%) were manufactured by pressing and sintering in H2. It showed that Fe3P is the best phosphorus carrier, resulting in fine and regular microstructure and in high impact energy data at 0.3 … 0.45%P while red P and also Fe2P showed a tendency to agglomeration, with resulting secondary porosity. At high P levels the mechanical properties tend to drop, for the tensile strength at P > 0.60%P while for the impact energy the threshold is 0.45%P. The dimensional behaviour of Fe-C-P can be related to PM aluminium alloys, expansion by transient liquid phase being followed by shrinkage by persistent liquid phase, at least at higher temperatures. In contrast to the dimensional behaviour, degassing and reduction is hardly affected by the phosphorus content.

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Effect of carbon and phosphorus addition on sintered density and effect of carbon removal on mechanical properties of high density sintered steel

Cited by 11 publications

References 3 publications

Fatigue and fracture parameters of diffusion alloyed Cu–Ni–Mo sintered steel

Fatigue and fracture parameters of diffusion alloyed Cu–Ni–Mo sintered steel

Effect of boron on sintering of a ferritic stainless steel

Phosphorus in Sintered Steels: Effect of Phosphorus Content and P Carrier in Sintered Steel Fe-C-P

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