A Case of Aluminum Nitride Embrittlement of Heavy Wall Cast Steel

Maciejewski, J.; Regulski, C.

doi:10.1007/s11668-017-0360-x

Cited by 5 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microstructural analyses reported in Figs. 8 and 9 did not reveal the presence of the most common secondary phases responsible for hot cracking such as manganese sulfides [4,14] and aluminum nitrides [6]. In contrast, EDS analyses revealed chromium-rich precipitates in thin intergranular cracks.…”

Section: Discussionmentioning

confidence: 86%

See 1 more Smart Citation

Determination of the Root Causes for Cracking in a Large-Size Cast Ingot of AISI 4317 Steel Using Microstructural Analysis

Loucif

Bitterlin

Jahazi

et al. 2018

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

The objective of the present work is to study the root causes for the cracking and material detachment from the external surface of a 10 metric tons high-strength low-alloy steel ingot after solidification and annealing processes. Failure analysis investigations were conducted on different samples from the cracked areas as well as from non-cracked ones. A combination of optical and electron microscopies, x-ray diffraction, and microhardness techniques were used to study and analyze the nature, morphology, and composition of the different microstructural components in the cracked regions. Thermodynamic software, Thermo-Calc Ò was used to corroborate and interpret the experimental findings with the existing theories. The results indicated a strong intergranular character of the cracks accompanied by the presence of second-phase particles at prior austenite grain boundaries. Segregation of chromium and manganese was demonstrated through local chemical analysis of the grain boundaries. It was concluded that a rapid cooling rate combined with the weakening of grain boundaries was at the origin of crack initiation.

show abstract

Section: Discussionmentioning

confidence: 86%

“…1. Precipitation of secondary phases such as sulfides [4,5], aluminum nitrides [6], or phosphorus segregation [7]. Generally, these phases are observed at the grain boundary regions and result from the segregation of alloying elements.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Root Causes for Cracking in a Large-Size Cast Ingot of AISI 4317 Steel Using Microstructural Analysis

Loucif

Bitterlin

Jahazi

et al. 2018

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

show abstract

“…The fracture propagates through the grain, rarely between the grains [4]. It was found that the AlN precipitation occurs predominantly at grain boundaries and dislocations and depends on the content of nitrogen and aluminium in steel [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Screw Failed During Installation

Demčáková¹,

Mašlejová²,

Hrabčáková³

et al. 2020

DDF

View full text Add to dashboard Cite

Material used for screw production was investigated due to its inconvenient properties which caused the screw breaking on threads or in the head during the installation. Chemical composition of analyzed material corresponded with standard STN 17153 according to technological drawing for specific product. The metallographic analysis showed that failure of screws happened due to improper microstructure resulting from unsuitable thermal treatment of material. Fine inclusions based on aluminum nitride (AlN) and chromium carbonitride (Cr(C,N)) were segregated along the ferritic grain boundaries. Coarse aluminum nitride inclusions (AlN) in ferritic matrix affected the character of present fracture surface characterized by cleavage facettes. The fracture was propagated step by step following the planes with the increased concentration of inclusions across the whole cross-section of the screw.

show abstract