Fatigue strength of ferritic ductile cast iron hardened by super rapid induction heating and quenching

Yoshitaka Misaka, Kazuhiro Kawasaki, Jun Komotori, Masao Shimizu

研究成果: Article

6 引用 (Scopus)

抄録

To clarify the effects of Super Rapid Induction Heating and Quenching (SRIHQ) on fatigue properties of Ferrite Ductile Cast Iron (FDI), rotational bending fatigue tests were carried out on specimens treated with four types of heating cycle. Results showed that; (i) the SRIHQ process generated a thin dark gray area around the graphite. This dark area was composed of a martensite structure (ringed martensite). (ii) The ringed martensite generated a compressive residual stress field at the surface hardened layer. Two types of compressive residual stress generative mechanisms were observed. One was a microscopic residual stress generative process due to the formation of ringed martensite and the other was a macroscopic residual stress generative process due to the expansion of the surface hardened layer. (iii) The fatigue strength of SRIHQ treated FDI specimen was higher than that of the untreated one. This was because the compressive residual stress field generated by the ringed martensite suppressed initiation and propagation of fatigue cracks.

元の言語English
ページ(範囲)2930-2935
ページ数6
ジャーナルMaterials Transactions
45
発行部数9
出版物ステータスPublished - 2004 9

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induction heating
Induction heating
martensite
Cast iron
Martensite
residual stress
casts
Quenching
Residual stresses
quenching
iron
Compressive stress
stress distribution
Ferrite
ferrites
surface layers
Fatigue of materials
bending fatigue
fatigue tests
Graphite

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

これを引用

Fatigue strength of ferritic ductile cast iron hardened by super rapid induction heating and quenching. / Misaka, Yoshitaka; Kawasaki, Kazuhiro; Komotori, Jun; Shimizu, Masao.

:: Materials Transactions, 巻 45, 番号 9, 09.2004, p. 2930-2935.

研究成果: Article

Misaka, Yoshitaka ; Kawasaki, Kazuhiro ; Komotori, Jun ; Shimizu, Masao. / Fatigue strength of ferritic ductile cast iron hardened by super rapid induction heating and quenching. :: Materials Transactions. 2004 ; 巻 45, 番号 9. pp. 2930-2935.
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AB - To clarify the effects of Super Rapid Induction Heating and Quenching (SRIHQ) on fatigue properties of Ferrite Ductile Cast Iron (FDI), rotational bending fatigue tests were carried out on specimens treated with four types of heating cycle. Results showed that; (i) the SRIHQ process generated a thin dark gray area around the graphite. This dark area was composed of a martensite structure (ringed martensite). (ii) The ringed martensite generated a compressive residual stress field at the surface hardened layer. Two types of compressive residual stress generative mechanisms were observed. One was a microscopic residual stress generative process due to the formation of ringed martensite and the other was a macroscopic residual stress generative process due to the expansion of the surface hardened layer. (iii) The fatigue strength of SRIHQ treated FDI specimen was higher than that of the untreated one. This was because the compressive residual stress field generated by the ringed martensite suppressed initiation and propagation of fatigue cracks.

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