Metallurgie der Schweißung austenitischer nichtrostender Stähle

Folkhard, Erich; Rabensteiner, Günther; Perteneder, Ernst; Schabereiter, Heinz; Tösch, Josef

doi:10.1007/978-3-7091-4449-7_9

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Eine legierungstechnische Möglichkeit, die r-Phasenausscheidung zu längeren Zeiten zu verschieben, ist durch eine Erhöhung des Stickstoffgehaltes gegeben [5,9]. Aus diesem Grund wurde bei der Pulverherstellung das Ausgangsmaterial GX150CrNiMoCuN41-6-2 unter Stickstoffatmosphäre erschmolzen und verdüst.…”

Section: Laserumschmelzenunclassified

“…Durch die Legierungselemente werden sowohl der Temperaturbereich der r-Phasenausscheidung in nichtrostenden Stählen als auch die Umwandlungskinetik beeinflusst. Umfangreiche Untersuchungen des Ausscheidungsverhaltens hochlegierter Stähle lassen erkennen, dass insbesondere ferritstabilisierende Elemente wie Molybdän und Silizium die Ausscheidung der rPhase zum Teil stärker beschleunigen als das Element Chrom [5]. Die Empfindlichkeit ferritisch-austenitischer Stähle gegenüber der r-Phasenbildung wird von Norström et al [6] mit der Berechnung eines "r-Phasen-Ä quivalentes" abgeschätzt, wobei dem starken Einfluss des Elementes Molybdän mit einem Faktor 4 bis 5 Rechnung getragen wird (Gleichung (1).…”

Section: Introductionunclassified

See 1 more Smart Citation

Funktionale Oberflächen auf Duplex‐Stahl durch Laserfeinbeschichten

Dwars¹,

Emmel²

2008

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Während der An-und Abfahrvorgänge mehrstufiger Hochdruckpumpen durchlaufen mediumgeschmierte Axial-und The product-lubricated axial and radial bearings installed in multistage high-pressure pumps inevitably encounter severe mixed friction conditions as the pumps start and stop. This leads to extremely high tribological loads on the bearing components, compounded by the effects of a highly corrosive pumped fluid. The present paper describes a laser cladding process which produces nearnet-shape coatings of new, highly corrosion and wear resistant functional layers which can be deposited directly on high-alloy stainless steels without requiring additional buffer layers and without affecting the mechanical properties and corrosion resistance of the substrate. The results cover the solidification behaviour of the coatings as well as the microstructure resulting from various heat treatment conditions. In addition, the technological properties of the coatings and the resulting composites are discussed. The coating systems are tested as to their corrosion resistance and tribological characterization in a pump-specific tribological system.

show abstract

Section: Laserumschmelzenunclassified

Section: Introductionunclassified

Funktionale Oberflächen auf Duplex‐Stahl durch Laserfeinbeschichten

Dwars¹,

Emmel²

2008

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…The formation of hot cracks has been investigated mainly during welding of stainless steels. [ 21 ] These cracks evolve due to a combination of low‐melting phases, which are mainly formed by sulfur and phosphorus, and stresses caused by the volume reduction during solidification and by shrinkage during cooling. As delta ferrite exhibits a higher solubility for these impurities compared with austenite, hot cracking susceptibility can be significantly reduced by guaranteeing at least a partly ferritic solidification path.…”

Section: Introductionmentioning

confidence: 99%

Defects in a Laser Powder Bed Fused Tool Steel

et al. 2020

View full text Add to dashboard Cite

Compared to conventional fabrication methods, additive manufacturing (AM) introduces new opportunities in terms of design freedom and part complexity due to the incremental layer‐by‐layer process. For tooling applications, higher cutting speeds can be realized by implementing of internal cooling channels in tools that could not be fabricated otherwise. However, processability of high‐alloyed tool steels with laser powder bed fusion (LPBF) faces certain restrictions. In addition to pore formation, severe cracking caused by a combination of process‐related stresses due to the high thermal gradient and susceptible materials may occur. This work aims to clarify the occurrence of process‐related defects in dependence of the applied energy input of a high‐alloyed cold‐work tool steel and to correlate it to the evolution of microstructure respectively solidification structure. Defect surfaces and structural evolution are investigated. The results exhibit that with increasing energy input porosity changes from lack‐of‐fusion to keyhole porosity. Most recently published investigations suggest cold cracking as predominant failure mechanism during LPBF of tool steels. However, for the investigated material, the present study clearly reveals that, irrespective of the chosen energy input, hot cracks are formed. Crack propagation can be connected to the solidification structure and possible thermal stress accumulations caused by the process.

show abstract

Metallurgie der Schweißung austenitischer nichtrostender Stähle

Cited by 2 publications

References 0 publications

Funktionale Oberflächen auf Duplex‐Stahl durch Laserfeinbeschichten

Funktionale Oberflächen auf Duplex‐Stahl durch Laserfeinbeschichten

Defects in a Laser Powder Bed Fused Tool Steel

Contact Info

Product

Resources

About