Thixocast Fe-based alloy material and process for heating the same
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMasayuki Tsuchiya, Hiroaki Ueno
Life of this patent
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Abstract
A thixocast Fe-based alloy material is provided, from which a cast product having mechanical properties uniform over the whole thereof can be produced. The Fe-based alloy material comprises 1.8% by weight≦C≦2.5% by weight, 1.0% by weight≦Si≦3.0% by weight, 0.1% by weight≦Mn≦1.5% by weight, 0.5% by weight≦Ni≦3.0% by weight, and as the balance, iron (Fe) including inevitable impurities. The eutectic crystal amount Ec is in a range of 10% by weight<Ec<50% by weight.
Claims6
A thixocast Fe-based alloy material comprising
- 1.8% by weight≦C≦2.5% by weight,
- 1.0% by weight≦Si≦3.0% by weight,
- 0.1% by weight≦Mn≦1.5% by weight,
- 0.5% by weight≦Ni≦3.0% by weight, and
- as the balance, iron (Fe) including inevitable impurities,
- wherein a eutectic crystal amount Ec is in a range of 10% by weight<Ec<50% by weight.
A thixocast Fe-based alloy material comprising
- 1.8% by weight≦C≦2.5% by weight
- 1.0% by weight≦Si≦3.0% by weight
- 0.8% by weight≦Mn≦1.5% by weight, and
- as the balance, iron (Fe) including inevitable impurities,
- wherein a eutectic crystal amount Ec is in a range 10% by weight<Ec<50% by weight.
A thixocast Fe-based alloy material, comprising carbon (C) of a content in a range of 1.8% by weight≦C≦2.5% by weight, silicon (Si) of a content in a range of 1.0% by weight≦Si≦3.0% by weight, manganese (Mn) of a content in a range of 0.6% by weight≦Mn≦1.5% by weight, at least one of nickel (Ni) of a content in a range of 0.2% by weight≦Ni≦3.0% by weight and titanium (Ti) of a content in a range of 0.05% by weight≦Ti≦0.6% by weight, the total sum of the Mn content, the Ni content and the Ti content being equal to or larger than 0.8% by weight (Mn+Ni+Ti≧0.8% by weight), and the balance being iron (Fe) including inevitable impurities, wherein a eutectic crystal amount is in a range of 10% by weight<Ec<50% by weight.
A process for heating a thixocast Fe-based alloy material having a chilled structure into a semi-molten state in which solid and liquid phases coexist,
- the process comprising setting an average rate HR of heating to a point A1 in an Fe—C based equilibrium diagram to be in a range of 0.5° C./sec≦HR≦6.0° C./sec, and setting a maximum temperature gradient TG of the inside of the Fe-based alloy material per unit distance to be at TG≦7° C./mm.
Dependencies are inferred from the claim text.