Activated sintering of P/M duplex stainless steel powders

Kazior, J.; Nykiel, Marek; Pieczonka, T.; Puscas, T. Marcu; Molinari, A.

doi:10.1016/j.jmatprotec.2004.07.140

Cited by 35 publications

(22 citation statements)

References 6 publications

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“…When C+ powders were sintered at 1200°C, complete or near-to-complete sintering could be achieved by the presence of a small amount of liquid phase. Kazior et al [19] also reported the improvement of sintering behavior by adding boron into stainless steels. In the case of M powders, the melting started at 1272°C during heating and the solidification finished at 1249°C during cooling (Figure 8(b)).…”

Section: Discussionmentioning

confidence: 98%

Correlation of Microstructure with Hardness, Wear Resistance, and Corrosion Resistance of Powder-Injection-Molded Specimens of Fe-Alloy Powders

Son

Yoon²,

Lee

2009

Metall Mater Trans A

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In this study, the powder injection molding (PIM) process was applied to Fe-alloy powders. Microstructure, hardness, wear resistance, and corrosion resistance of the PIM specimens were analyzed and compared with those of a conventional stainless steel, SS316L. When Fe-alloy powders were injection molded and then sintered at 1200°C or 1250°C, completely densified specimens with almost no pores were obtained. They contained 63 to 80 vol pct of hard (Cr,Fe) 2 B dispersed in the austenite or martensite matrix. Since these (Cr,Fe) 2 B borides were very hard, thermally stable, and corrosion resistant, hardness, high-temperature hardness, wear resistance, and corrosion resistance of the PIM specimens of Fe-alloy powders were 2 to 5 times as high as those of the stainless steel. Such property improvement suggested new applicability of the PIM products of Fe-alloy powders to structures and parts requiring excellent mechanical properties.

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Section: Discussionmentioning

confidence: 98%

Correlation of Microstructure with Hardness, Wear Resistance, and Corrosion Resistance of Powder-Injection-Molded Specimens of Fe-Alloy Powders

Son

Yoon²,

Lee

2009

Metall Mater Trans A

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“…Consequently, rapid changes in pH are observed in the electrolyte, with increasing concentration of chloride and hydrogen ions inside the pores, which subsequently leads to transition of the material from a passive to active state. The phenomena that occur in sintered stainless steels usually lead to pitting or crevice corrosion [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Surface remelting of 316 L + 434 L sintered steel: microstructure and corrosion resistance

Dudek

Wrońska

Adamczyk

2014

J Solid State Electrochem

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This study presents arc surface remelting of three types of sintered stainless steels carried out in order to constitute a homogeneous microstructure in the surface layer which is free from open and interconnected porosity. The main aim of this treatment was to improve functional properties of the sinters analysed, especially their resistance to pitting corrosion. The sinters were obtained from powders of 316 L and 434 L steels. The PM austenitic-ferritic stainless steels are used mainly in the automotive industry, but their general application is still limited due to relatively poor corrosion properties when compared to casts or wrought components. This study used the gas tungsten arc welding (GTAW) process as a method of economical surface treatment. The effect of surface treatment was evaluated based on macro-and microstructural observations, energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray phase analysis, measurements of surface roughness and electrochemical examinations. It was found that a cellular or mixed cellular and dendritic structure was formed in the remelted zone of the sinters after remelting. X-ray analysis demonstrated that application of remelting contributes to formation of the austenitic phase in the surface layer. The corrosion resistance of the remelted surface layers was evaluated using polarization tests in 0.5 M NaCl solution. It was found that arc surface remelted layers exhibit much better anticorrosive properties than sinters without surface treatment. Microstructural observations of the surface of specimens after electrochemical tests showed only a few single pits in the remelted layer, while the surface of initial sinters was much more corroded.

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“…Duplex SS sintered in vacuum or in hydrogen are investigated in many works [2,11,13,[15][16][17][18] but little information is found about PM duplex SS sintered in nitrogen. The optimization of wrought and cast duplex SS has resulted in continuous material development related to their alloying, especially with nitrogen and the resulting mechanical, corrosion and wear properties as well as weldability [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of ageing heat treatments on the microstructure and intergranular corrosion of powder metallurgy duplex stainless steels

et al. 2010

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a b s t r a c tThe influence of ageing heat treatments (675 and 875°C for 1.5 to 48 h) on the microstructure and intergranular corrosion resistance of sintered in nitrogen duplex stainless steels was investigated. The materials were obtained by sintering mixtures of austenitic AISI 316L and ferritic AISI 430L powders. Corrosion behaviour was evaluated by using electrochemical techniques. The beneficial effect of nitrogen on corrosion behaviour of solution annealed samples was established. During ageing, secondary phases were precipitated and the intergranular and transgranular corrosion resistance significantly decreased though repassivation was observed in specimens aged at 875°C for times up to 8 h.

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Activated sintering of P/M duplex stainless steel powders

Cited by 35 publications

References 6 publications

Correlation of Microstructure with Hardness, Wear Resistance, and Corrosion Resistance of Powder-Injection-Molded Specimens of Fe-Alloy Powders

Correlation of Microstructure with Hardness, Wear Resistance, and Corrosion Resistance of Powder-Injection-Molded Specimens of Fe-Alloy Powders

Surface remelting of 316 L + 434 L sintered steel: microstructure and corrosion resistance

Effect of ageing heat treatments on the microstructure and intergranular corrosion of powder metallurgy duplex stainless steels

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