Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Youji Mizuhara

Munetsugu Matsuo

Naoya Masahashi

Hiroaki Sakamoto

Miho Tomita

Tooru Inaguma

Toshihiro Hanamura

Keizo Hashimoto

Hideki Fujii

Masao Kimura

Hiroo Suzuki

A cast slab containing C: less than 0.02 mass % and made of an Fe-based metal of an &#x3b1;-&#x3b3; transforming component is subjected to hot rolling at a temperature of an A3 point or higher and is subjected to &#x3b1;-region rolling at a temperature of 300&#xb0; C. or higher and lower than the A3 point, and thereby a base metal sheet having a {100} texture in a surface layer portion is fabricated. Then, by performing a heat treatment under predetermined conditions, an Fe-based metal sheet is obtained in which a Z value is not less than 2.0 nor more than 200 when intensity ratios of respective {001}&#x3c;470&#x3e;, {116}&#x3c;6 12 1&#x3e;, and {223}&#x3c;692&#x3e; directions in a sheet plane by X-ray diffraction are set to A, B, and C respectively and Z=(A+0.97B)/0.98C is satisfied.

Fe-based metal sheet and manufacturing method thereof

On at least one surface of a base metal plate () of an &#x3b1;-&#x3b3; transforming Fe or Fe alloy, a metal layer () containing ferrite former is formed. Next, the base metal plate () and the metal layer () are heated to an A3 point of the Fe or the Fe alloy, whereby the ferrite former are diffused into the base metal plate () to form an alloy region () in a ferrite phase in which an accumulation degree of {200} planes is 25% or more and an accumulation degree of {222} planes is 40% or less. Next, the base metal plate () is heated to a temperature higher than the A3 point of the Fe or the Fe alloy, whereby the accumulation degree of the {200} planes is increased and the accumulation degree of the {222} planes is decreased while the alloy region () is maintained in the ferrite phase.

Fe-based metal plate and method of manufacturing the same

A cast slab containing C: less than 0.02 mass % and made of an Fe-based metal of an &#x3b1;-&#x3b3; transforming component is subjected to hot rolling at a temperature of an A3 point or higher and is subjected to &#x3b1;-region rolling at a temperature of 300&#xb0; C. or higher and lower than the A3 point, and thereby a base metal sheet having a {100} texture in a surface layer portion is fabricated. Then, by performing a heat treatment under predetermined conditions, an Fe-based metal sheet is obtained in which a Z value is not less than 2.0 nor more than 200 when intensity ratios of respective {001}&#x3c;470&#x3e;, {116}&#x3c;6 12 1&#x3e;, and {223}&#x3c;692&#x3e; directions in a sheet plane by X-ray diffraction are set to A, B, and C respectively and Z =(A+0.97B)/0.98C is satisfied.

Process for producing TiAl intermetallic compound-base alloy materials

TiAl-besed intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.

TiAl-based intermetallic compound alloys and processes for preparing the

TiAl-based intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.

Tial-based intermetallic compound alloys and processes for preparing the

Tial-based intermetallic compound alloys having superplasticity

This invention relates to TiAl based intermetallic compound alloy and process for producing; the object of this invention is to improve high temperature deformability. The alloy comprises basic components: Ti.sub.y AlCr.sub.x, wherein 1%.ltoreq.X.ltoreq.5%, 47.5%.ltoreq.Y.ltoreq.52%, and X+2Y.gtoreq.100%, and comprises a fine-grain structure with a .beta. phase precipitated on a grain boundary of equiaxed .gamma. grain having grain size of less than 30 .mu.m, and possessing a superplasticity such that the strain rate sensitivity factors (m value) is 0.40 or more and tensile elongation is 400% or more tested at 1200.degree. C. and a strain rate of 5.times.10.sup.-4 S.sup.-1.

Process for producing .gamma. and .beta. dual phase TiAl based

This invention relates to TiAl based intermetallic compound alloy and process for producing; the object of this invention is to improve high temperature deformability. The alloy comprises basic components: Ti.sub.y AlCr.sub.x, wherein 1%.ltoreq.X.ltoreq.5%, 47.5%.ltoreq.Y.ltoreq.52%, and X+ 2Y.gtoreq.100%, and comprises a fine-grain structure with a .beta. phase precipitated on a grain boundary of equiaxed .gamma. grain having grain size of less than 30 .mu.m, and possessing a superplasticity such that the strain rate sensitivity factors (m value) is 0.40 or more and tensile elongation is 400% or more tested at 1200.degree. C. and a strain rate of 5.times.10.sup.-4 S.sup.-1.

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Kawasaki, Japan

Youji Mizuhara