溶体化処理した高Mn鋼の500°恒温加熱による相変化

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  • Phase Translation in Isothermally Heated Hadfield Steel at 500°, After Solution Treatment
  • ヨウタイカ ショリ シタ コウMn コウ ノ 500 コウオン カネツ ニ ヨル ソウヘンカ
  • Phase Translation in Isothermally Heated Hadfield Steel at 500°, After Solution Treatment

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Hadfield steels, isothermally heated at some temperatures, precipitates grain-boundary carbides, platelet carbides and pearlitic constituents. In steels, with the precipitates grown up to large quantity, γ was transformed to ε at about room temperature in cooling, then the ε phase was present with carbides and α in steels. The equilibrium phases of Hadfield steels at room temperature were reported as α+carbide, but the process of phase translation leading to equilibrium is not yet known. In this works, standard Hadfield steels of chemical composition of C 1.2%, Mn 13.71% and isothermally heated at 500° for various durations after solution treatment, were studied mainly dilatometrically and magnetically. At 500°, the γ-phase in this steel was primarily translated to (γ+c), next to (γ+α+c) to (α+c) and to the final equilibrium phase (α+c). But it required a very long time to attain the equilibrium phase. At room temperature, the γ-phase in this steel primarily translated to (γ+c), then to (γ+α+c), to (γ+ε+α+c), to (ε+α+c), to (α+c), and to finally to the equilibrium phase (α+c). The ε-phase in Hadfield steel is apparently a metastable phase which appears in phase translation process to equilibrium.

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