Einfluß von Rekristallisation und Korngrenzenausscheidungen auf die mechanischen Eigenschaften des warmumgeformten X 2 NiCoMoTi 18 12 4-Stahles

Zechmeister, Hartwin; Zeilinger, Hans; Schmitt-Thomas, Karlheinz-Günther

doi:10.1002/srin.197804668

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Zechmeister et al [54] reported an increase in the yield and ultimate tensile strength values in C18Ni2400 with decrease in PAG size, when there was no decoration of the grain boundaries with carbides; a Hall -Petch relationship was obeyed.…”

Section: Martensite Morphologymentioning

confidence: 99%

“…Zechmeister et al [54] showed that fracture toughness of maraging steel embrittled by grain boundary precipitation of titanium carbonitrides can be considerably improved by a sufficiently high amount of hot forming in the temperature range in which TE occurs. By destroying the grain boundary network of carbonitrides the hot working operation contributes to improvement in fracture toughness.…”

Section: Heat Treatments To Refine the Pag And To Undo The Tementioning

confidence: 99%

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Progress in understanding the metallurgy of 18% nickel maraging steels

Rao

2006

International Journal of Materials Research

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Progress in understanding the metallurgy of 18 % nickel maraging steelsMaraging steels based on iron -nickel martensite constitute a very important family of high-strength steels, which distinguishes itself by demonstrating an unparalleled combination of excellent fabricability and high strength and fracture toughness after heat treatment. Heat treatment of these steels has now been perfected to ensure consistently high levels of strength, ductility, and toughness in a variety of product shapes and sizes. Cobalt-free variants have been commercialized as part of efforts to save production costs. Further knowledge has been generated on 18 % nickel maraging steels regarding phases precipitating during aging, thermal embrittlement, thermal cycling and austenite reversion/retention and their effect on mechanical properties. The paper reviews the progress made over the last one and half decades.

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Section: Martensite Morphologymentioning

confidence: 99%

Section: Heat Treatments To Refine the Pag And To Undo The Tementioning

confidence: 99%

Progress in understanding the metallurgy of 18% nickel maraging steels

Rao

2006

International Journal of Materials Research

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“…Figure 2 shows schematically the proposed hot working schedule. It was taken note that rings of low alloy steels of similar size were rolled by using pre-heating temperatures in the range 1100 -1150 o C. Zechmeister et al, [2] showed that K Ic of maraging steel embrittled by grain boundary precipitation of titanium carbonitrides can be considerably improved by a sufficiently high amount of hot forming in the temperature range in which thermal embrittlement occurs. By destroying the grain boundary network of carbonitrides, the hot working contributes to improvement in K Ic.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Analaysis of failures encountered during rolling of rings of maraging steel

Rao¹,

Sivasubramanian²,

Chatterjee³

2007

Materialwissenschaft Werkst

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Large-sized rings of maraging steel X 2 NiCoMo 18 8 5 (Werkstoff Nr. 1.6359) find application in aerospace. The rings are required to demonstrate high strength and fracture toughness in both radial and axial directions. The processing is accordingly carried out under controlled conditions to realize a microstructure capable of attaining the specified strength and toughness after heat treatment. The rings rolled during initial trials failed to attain the required fracture toughness. Precipitation of carbonitrides at prior austenitic grain (PAG) boundaries in the temperature range 820 -980 o C contributed to the failure. Efforts were made to do final rolling through this temperature range, to prevent a microstructure comprising of PAG boundaries decorated by carbonitrides from evolving. To this end relatively low preheating temperatures (1100 -1150 o C) were adopted. Failures were encountered in realizing the desired final size and shape of the rings. The mill tripped before the ring rolling could be completed. Failure was analyzed and it was concluded that the problem was due to the high flow stress levels encountered during ring rolling and the relatively low radial loads the mill was capable of delivering.Keywords

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Progress in understanding the metallurgy of 18% nickel maraging steels

Rao

2006

International Journal of Materials Research

View full text Add to dashboard Cite

Maraging steels based on iron –nickel martensite constitute a very important family of high-strength steels, which distinguishes itself by demonstrating an unparalleled combination of excellent fabricability and high strength and fracture toughness after heat treatment. Heat treatment of these steels has now been perfected to ensure consistently high levels of strength, ductility, and toughness in a variety of product shapes and sizes. Cobalt-free variants have been commercialized as part of efforts to save production costs. Further knowledge has been generated on 18% nickel maraging steels regarding phases precipitating during aging, thermal embrittlement, thermal cycling and austenite reversion/retention and their effect on mechanical properties. The paper reviews the progress made over the last one and half decades.

show abstract

Einfluß von Rekristallisation und Korngrenzenausscheidungen auf die mechanischen Eigenschaften des warmumgeformten X 2 NiCoMoTi 18 12 4-Stahles

Cited by 3 publications

References 4 publications

Progress in understanding the metallurgy of 18% nickel maraging steels

Progress in understanding the metallurgy of 18% nickel maraging steels

Analaysis of failures encountered during rolling of rings of maraging steel

Progress in understanding the metallurgy of 18% nickel maraging steels

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