鉄-りん合金の粒界破壊の炭素による抑制

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書誌事項

タイトル別名
  • Prevention of the Intergranular Fracture in Iron-Phosphorus Alloys by Carbon
  • テツ リン ゴウキン ノ リュウカイ ハカイ ノ タンソ ニ ヨル ヨクセイ
公開日
1984
DOI
  • 10.2355/tetsutohagane1955.70.16_2262
公開者
一般社団法人 日本鉄鋼協会

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説明

Fe-P alloys with up to 0.67wt% phosphorus show intergranular fracture (IGF) by impact test after quenched from 1 073 K. Addition of carbon up to about 0.01wt% to the alloys prevents the intergranular fracture caused by the grain boundary segregation of phosphorus, and lowers the ductile-brittle transition temperature (DBTT). This effect is due to the segregation of carbon to grain boundaries. Aging at 873 K of the quenched specimen with 0.52%P and 0.0008%C reduces DBTT and increases the degree of grain boundary segregation of carbon while it does not affect the degree of grain boundary segregation of phosphorus. The grain boundary segregation of carbon increases the grain boundary cohesion and prevents the intergranular fracture without removing phosphorus from grain boundaries.<BR>DBTT's of the Fe-P-C alloys are analyzed in terms of the degree of grain boundary segregation of carbon and phosphorus and the solution hardening by phosphorus (the bulk concentration of phosphorus). The site-competition between carbon and phosphorus is taken into account in the calculation of the degree of segregation. It is found that the increase in the boundary cohesion by the carbon segregation is an important factor to prevent IGF.

収録刊行物

  • 鉄と鋼

    鉄と鋼 70 (16), 2262-2268, 1984

    一般社団法人 日本鉄鋼協会

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