Influence of carbides morphology on fracture toughness of cast steel G200CrMoNi4-3-3

Stradomski, Z.; Pirek, A.; Dyja, D.

doi:10.1007/s11223-008-0033-9

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2013

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“…Cracks in the high-carbon low-alloyed hypereutectic cast steels used e.g. for production of tools for metallurgy industry are most frequently revealed only during the final mechanical working of the heat-treated castings [3][4][5][6]. The material for examination comes from the cracked steel mill rolls of several tons weight, made of either L180HMF or L200HNM cast steel.…”

Section: Results Of Investigation and Their Discussionmentioning

confidence: 99%

Fracture Mechanisms in Steel Castings

Stradomski¹,

Stachura²,

Stradomski³

2013

Archives of Foundry Engineering

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The investigations were inspired with the problem of cracking of steel castings during the production process. A single mechanism of decohesion - the intergranular one - occurs in the case of hot cracking, while a variety of structural factors is decisive for hot cracking initiation, depending on chemical composition of the cast steel. The low-carbon and low-alloyed steel castings crack due to the presence of the type II sulphides, the cause of cracking of the high-carbon tool cast steels is the net of secondary cementite and/or ledeburite precipitated along the boundaries of solidified grains. Also the brittle phosphor and carbide eutectics precipitated in the final stage solidification are responsible for cracking of castings made of Hadfield steel. The examination of mechanical properties at 1050°C revealed low or very low strength of high-carbon cast steels.

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Section: Results Of Investigation and Their Discussionmentioning

confidence: 99%