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    Thermomechanical processing of plasma sprayed intermetallic sheets
    52.
    发明授权
    Thermomechanical processing of plasma sprayed intermetallic sheets 有权
    等离子喷涂金属间板的热机械加工

    公开(公告)号：US06332936B1

    公开(公告)日：2001-12-25

    申请号：US09399364

    申请日：1999-09-20

    申请人： Mohammad R. Hajaligol ,  Clive Scorey ,  Vinod K. Sikka ,  Seetharama C. Deevi ,  Grier Fleischhauer ,  A. Clifton Lilly, Jr. ,  Randall M. German

    发明人： Mohammad R. Hajaligol ,  Clive Scorey ,  Vinod K. Sikka ,  Seetharama C. Deevi ,  Grier Fleischhauer ,  A. Clifton Lilly, Jr. ,  Randall M. German

    IPC分类号： B22F500

    CPC分类号： C22C33/0278 ,  B22F3/18 ,  B22F5/006 ,  B22F9/082 ,  B22F2003/248 ,  B22F2009/0824 ,  B22F2009/088 ,  B22F2998/10 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0273 ,  C22C1/0491 ,  B22F3/115 ,  B22F3/16 ,  B22F3/24

    摘要： A powder metallurgical process of preparing a sheet from a powder having an intermetallic alloy composition such as an iron, nickel or titanium aluminide. The sheet can be manufactured into electrical resistance heating elements having improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The iron aluminide has an entirely ferritic microstructure which is free of austenite and can include, in weight %, 4 to 32% Al, and optional additions such as ≦1% Cr, ≧0.05% Zr ≦2% Ti, ≦2% Mo, ≦1% Ni, ≦0.75% C, ≦0.1% B, ≦1% submicron oxide particles and/or electrically insulating or electrically conductive covalent ceramic particles, ≦1% rare earth metal, and/or ≦3% Cu. The process includes forming a non-densified metal sheet by consolidating a powder having an intermetallic alloy composition such as by roll compaction, tape casting or plasma spraying, forming a cold rolled sheet by cold rolling the non-densified metal sheet so as to increase the density and reduce the thickness thereof and annealing the cold rolled sheet. The powder can be a water, polymer or gas atomized powder which is subjecting to sieving and/or blending with a binder prior to the consolidation step. After the consolidation step, the sheet can be partially sintered. The cold rolling and/or annealing steps can be repeated to achieve the desired sheet thickness and properties. The annealing can be carried out in a vacuum furnace with a vacuum or inert atmosphere. During final annealing, the cold rolled sheet recrystallizes to an average grain size of about 10 to 30 &mgr;m. Final stress relief annealing can be carried out in the B2 phase temperature range.

    摘要翻译： 从具有金属间合金组成如粉末铁，镍或钛铝化物的粉末制备片材的粉末冶金方法。 可以将片材制造成具有改善的室温延展性，电阻率，耐循环疲劳性，耐高温氧化性，低和高温强度和/或耐高温下垂的电阻加热元件。 铁铝化物具有完全不含奥氏体的铁素体组织，并且可以以重量％计含有4至32％的Al和任选的添加物，例如<= 1％Cr，> = 0.05％Zr <= 2％Ti， = 2％Mo，<= 1％Ni，≤= 0.75％C，<= 0.1％B，≤1％亚微米级氧化物颗粒和/或电绝缘或导电共价陶瓷颗粒，≤1％稀土金属， 和/或<= 3％Cu。 该方法包括通过将具有金属间化合物组合物的粉末如通过辊压，带铸或等离子体喷涂固结形成非致密金属片，通过冷轧非致密金属片形成冷轧板，以增加 密度并减小其厚度并退火冷轧板。 粉末可以是在固结步骤之前与粘合剂进行筛分和/或共混的水，聚合物或气体雾化粉末。 在固结步骤之后，片材可以部分烧结。 可以重复冷轧和/或退火步骤以实现所需的板厚度和性能。 退火可以在真空或惰性气氛的真空炉中进行。 在最终退火期间，冷轧板再结晶至平均粒径约为10〜30μm。 最终的应力消除退火可以在B2相温度范围内进行。

    Iron aluminide useful as electrical resistance heating elements
    54.
    发明授权
    Iron aluminide useful as electrical resistance heating elements 有权
    具有氧化物分散体的铁铝化物片的加工

    公开(公告)号：US06280682B1

    公开(公告)日：2001-08-28

    申请号：US09399355

    申请日：1999-09-20

    申请人： Vinod K. Sikka ,  Seetharama C. Deevi ,  Grier S. Fleischhauer ,  Mohammad R. Hajaligol ,  A. Clifton Lilly, Jr.

    发明人： Vinod K. Sikka ,  Seetharama C. Deevi ,  Grier S. Fleischhauer ,  Mohammad R. Hajaligol ,  A. Clifton Lilly, Jr.

    IPC分类号： B22F102

    CPC分类号： C22C33/0278 ,  B22F3/23 ,  B22F2998/00 ,  B22F2998/10 ,  B22F2999/00 ,  C22C1/0491 ,  B22F3/04 ,  B22F9/082 ,  B22F3/1208 ,  B22F3/20 ,  B22F3/15 ,  B22F3/18 ,  B22F3/10 ,  B22F2201/05

    摘要： The invention relates generally to aluminum containing iron-base alloys useful as electrical resistance heating elements. The aluminum containing iron-base alloys have improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The alloy has an entirely ferritic microstructure which is free of austenite and includes, in weight %, over 4% Al, ≦1% Cr and either ≧0.05% Zr or ZrO2 stringers extending perpendicular to an exposed surface of the heating element or ≧0.1% oxide dispersoid particles. The alloy can contain 14-32% Al, ≦2% Ti, ≦2% Mo, ≦1% Zr, ≦1% C, ≦0.1% B, ≦30% oxide dispersoid and/or electrically insulating or electrically conductive covalent ceramic particles, ≦1% rare earth metal, ≦1% oxygen, ≦3% Cu, balance Fe.

    摘要翻译： 本发明一般涉及可用作电阻加热元件的含铝铁基合金。 含铝铁基合金具有改善的室温延展性，电阻率，循环耐疲劳性，耐高温氧化性，低，高温强度和/或耐高温下垂的能力。 该合金具有完全不含奥氏体的铁素体组织，其重量％包括超过4％的Al，≤1％的Cr和> = 0.05％的Zr或ZrO2桁条，其垂直于加热元件的暴露表面延伸，或 > = 0.1％氧化物分散质颗粒。 该合金可以含有14-32％的Al，<= 2％Ti，<= 2％Mo，≤1％Zr，≤1％C，<= 0.1％B，<= 30％氧化物分散质和/或电 绝缘或导电共价陶瓷颗粒，<= 1％稀土金属，<= 1％氧，<= 3％Cu，余量为Fe。

    Method of manufacturing metallic products such as sheet by cold working and flash annealing
    56.
    发明授权
    Method of manufacturing metallic products such as sheet by cold working and flash annealing 有权
    通过冷加工和闪光退火制造片材等金属制品的方法

    公开(公告)号：US6143241A

    公开(公告)日：2000-11-07

    申请号：US247065

    申请日：1999-02-09

    申请人： Mohammad R. Hajaligol ,  Vinod K. Sikka

    发明人： Mohammad R. Hajaligol ,  Vinod K. Sikka

    IPC分类号： B21B3/00 ,  B22F3/02 ,  B22F3/24 ,  C21D7/02 ,  C21D8/00 ,  C22C38/00 ,  C22C38/18 ,  C22C38/34 ,  C22F1/00 ,  C22F1/10 ,  C22F1/18 ,  C23C4/18

    CPC分类号： C21D8/005 ,  B22F3/24 ,  C22F1/10 ,  C22F1/183 ,  B22F2998/00 ,  B22F2998/10

    摘要： A metallic alloy composition is manufactured into products such as press formed or stamped products or rolled products such as sheet, strip, rod, wire or band by one or more cold working steps with intermediate or final flash annealing. The method can include cold rolling an iron, nickel or titanium aluminide alloy and annealing the cold worked product in a furnace by infrared heating. The flash annealing is preferably carried out by rapidly heating the cold worked product to an elevated temperature for less than one minute. The flash annealing is effective to reduce surface hardness of the cold worked product sufficiently to allow further cold working. The product to be cold worked can be prepared by casting the alloy or by a powder metallurgical technique such as tape casting a mixture of metal powder and a binder, roll compacting a mixture of the powder and a binder or plasma spraying the powder onto a substrate. In the case of tape casting or roll compaction, the initial powder product can be heated to a temperature sufficient to remove volatile components. The method can be used to form a cold rolled sheet which is formed into an electrical resistance heating element capable of heating to 900.degree. C. in less than 1 second when a voltage up to 10 volts and up to 6 amps is passed through the heating element.

    摘要翻译： 金属合金组合物通过具有中间或最终闪光退火的一个或多个冷加工步骤被制造成诸如压制成型或冲压产品或轧制产品如片，条，棒，线或带的产品。 该方法可以包括冷轧铁，镍或钛铝合金合金，并通过红外加热在冷却炉中退火冷加工产品。 快速退火优选通过将冷加工产品快速加热至升高的温度少于1分钟来进行。 闪光退火有效地降低了冷加工产品的表面硬度，足以进一步冷加工。 待加工的产品可以通过铸造合金或通过粉末冶金技术制备，例如带状铸造金属粉末和粘合剂的混合物，辊压粉末和粘合剂的混合物或等离子体将粉末喷涂到基材上 。 在流延或辊压的情况下，初始粉末产品可被加热到足以除去挥发性成分的温度。 该方法可以形成冷轧板，该冷轧板形成为能够在不到1秒内加热到900℃的电阻加热元件，当高达10伏特和高达6安培的电压通过加热 元件。

    Ordered iron aluminide alloys having an improved room-temperature ductility and method thereof
    59.
    发明授权
    Ordered iron aluminide alloys having an improved room-temperature ductility and method thereof 失效
    具有改进的室温延展性的有序铁铝化合物及其方法

    公开(公告)号：US5084109A

    公开(公告)日：1992-01-28

    申请号：US548472

    申请日：1990-07-02

    申请人： Vinod K. Sikka

    发明人： Vinod K. Sikka

    IPC分类号： C21D8/00 ,  C22C38/06

    CPC分类号： C22C38/06 ,  C21D8/005

    摘要： A process is disclosed for improving the room temperature ductility and strength of iron aluminide intermetallic alloys. The process involves thermomechanically working an iron aluminide alloy by means which produce an elongated grain structure. The worked alloy is then heated at a temperature in the range of about 650.degree. C. to about 800.degree. C. to produce a B2-type crystal structure. The alloy is rapidly cooled in a moisture free atmosphere to retain the B2-type crystal structure at room temperature, thus providing an alloy having improved room temperature ductility and strength.

    摘要翻译： 公开了一种改善铁铝化物金属间合金的室温延展性和强度的方法。 该方法涉及通过产生细长晶粒结构的方法热机械地加工铁铝化合物。 然后将加工的合金在约650℃至约800℃的温度下加热以产生B2型晶体结构。 该合金在无水气氛中快速冷却，将B2型晶体结构保持在室温，从而提供具有改善的室温延展性和强度的合金。