88tpce009009 - ir.nctu.edu.tw pta welding on repairing land-based gas turbine components. high...

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Չଣ୯ৎᏢہ ΖΜΖԃΚמᏢӝբزीฝزԋᄔाൔ ຬӝߎ෮፺ယТϐዀঅ᎗ௗמ PTA Repairing of Superalloy Turbine Blades ฝጓဦǺNSC 88-TPC-E-009-009 Չයज़Ǻ88ԃ1Д1ВԿ88ԃ12Д31В ฝЬΓǺߏڬர௲ ୯ҥҬ೯εᏢᐒఓπำᏢ سǵύЎᄔा ҁीฝଞჹᙻ ୷ຬӝߎIN-738LCزǴЬाᙯ౽Ԅ۱ዀ ᎗ȐPlasma Transferred Arc, PTAȑמǴ ᔈҔܭ෮፺Їᔏಔޑӆғൻᕉ٬ҔǶ PTAӆғԋճҔଯ՜၂ᡍᆶଯ ൻᕉϯ၂ᡍǴෳ၂ځᐒఓமלϯ ΚǶԜѦଛӝ᎗ၰރϩǵ༾ฯǵߎϷSEMᢀჸځ༾ᢀಔᙃᆶઇᘐय़ ޑઇᄊǶ җӚჴᡍޑຑǴനགྷޑᙯ౽ Ԅ۱ዀ᎗ௗኧ115A ǵو240mm/min Ǵ᎗аڰྋೀǴ᎗ аڰྋਔਏೀޣǴځӧଯ߄ޑࢤ٫ǶჴᡍǴճҔᙯ౽Ԅ۱ዀ ᎗ȐPTAȑӆғޑࡕ၂ТǴځଯ՜ம ёډޑࡋ96% ѰѓǴჴᡍύന ޣҭёډޑࡋ89% ѰѓǴЪ ځלϯΚ٠όᇽܭǶ ᜢᗖຒǺᙻ୷ຬӝߎ, ᙯ౽Ԅ۱ዀ᎗, ෮፺Їᔏಔ, ൻᕉϯ Abstract This research was to investigate the repairing weldability of Nikel-base superalloy IN-738LC. The objective of this investigation was to study the effect of Plasma Transferred Arc ΰ PTA α welding on repairing land-based gas turbine components. High temperature tensile test and high temperature cyclic oxidation test were carried out to determine its mechanical strength and the ability of antioxidation. With weld pool shape analysis, microhardness measuring, metallography and SEM examination, its microstructure and the type of failure surface were determined. From experimental results, the best PTA parameters are 115A current, 240mm/min weld speed and with prewelded soluted treatment. It had also better performance in high temperature r ange. The result also shows that, with plasma tmsferred arc welding, the PTA repaired specimens can reach 96% tensile strength of IN-738LC parent metal. Even the weakest one can reach 89%. The ability of antioxidation of the PTA repaired one is not worser than IN-738LC parent metal. KeywordsǺNikel-based superalloy, Plasma Transferred Arc, Land-based gas turbine components, cyclic oxidation ΒǵीฝጔҗᆶҞ ޑϞВޑᐯ෮፺ᐒරଯਏᆶଯᒡ рी ǴԜཀښሡा׳ፄᚇޑယТ ᆶယТǴฅԜѸฅᏤठޑՏǶӢԜǴӵՖঅ೭٤٬Ҕӧᐯ෮፺ ᐒύςઇཞޑຬӝߎယТख़ा ޑ٣ǴԶа᎗ௗჴՉঅΨςԵቾǶӧ Ҟӄౚᕉߥܩᓐᆶ୯ৎอલ ޑਔයǴᐯ෮፺ယТӆғמޑǴჴ ӧॶளךݙЈΚزǶ ОΚቷ෮፺ᐒǴЬाճҔຬ ӝߎ෮፺ယТǴஒଯଯᓸޑᐯᙯඤԋ ޑᐒఓфǴᙖаᐒಔǶӢԜ ෮፺ယТޑπբᕉნǴόѦЯଯǵଯᓸ Ϸଯᙯೲ ǶԿځܭπբᕉნჹ෮፺ယТ ܌ԋޑઇᚯኳԄǴԖΠӈѤᅿǺ1. ੲമȐthermal fatigue ȑǵ2.ଯൻᕉੲ മȐhigh cycle fatigue ȑǵ3.՜ᆶԔᔈ ΚઇᚯȐtensile and bending stressesȑϷ4. ᐒఓઇཞȐmechanical damageȑǶ ܭආᙺ۱᎗ௗ ȐGTAWȑঅᙻ୷ຬӝߎယТǴத ԋӭ༾ಒᕳᆶόىǴӢԜրΓᔈҔᙯ౽Ԅ۱ዀ᎗অ מǴճҔዀޑΚᆶ ฯय़᎗ ޑфǴჹܭ෮፺ယТᆭᇑԶό ىޑҽǴуаЁκӆғᆶᕳǴӵ ԜஒёᗉխӢӭख़۱᎗ௗԶ܌ԋޑǶҞᙯ౽Ԅ۱ዀ᎗ௗᔈҔܭᆶฯय़מޑǴςϣѦӭ زՏᆶπ܌ǴЪςΕ ޑزΓΚǶ

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PTA Repairing of Superalloy Turbine Blades

�����NSC 88-TPC-E-009-009

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��Plasma Transfer red Arc, PTA� !�

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Abstract

This research was to investigate the

repairing weldability of Nikel-base superalloy

IN-738LC. The objective of this investigation

was to study the ef fect of Plasma Transfer red

Arc�PTA�welding on repairing land-based

gas turbine components. High temperature

tensile test and high temperature cyclic

oxidation test were carried out to determine

its mechanical strength and the ability of

antioxidation. With weld pool shape analysis,

microhardness measuring, metallography and

SEM examination, its microstructure and the

type of failure surface were determined.

From experimental results, the best PTA

parameters are 115A current, 240mm/min

weld speed and with prewelded soluted

treatment. It had also better per formance in

high temperature range. The result also shows

that, with plasma tmsferred arc welding, the

PTA repaired specimens can reach 96%

tensile strength of IN-738LC parent metal.

Even the weakest one can reach 89%. The

ability of antioxidation of the PTA repaired

one is not worser than IN-738LC parent metal.

KeywordsNikel-based superalloy, Plasma

Transferred Arc, Land-based gas turbine

components, cyclic oxidation

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1.R. Castillo, A.K. Koul and E.H. Toscano,

Journal o f Engineering for Gas Turbines and

Power, January l987, 99-106.

2.J.R. Kattus, "NONFERROUS ALLOYS",

March l984, Code 4217, 1-25.

3.D. Stellite, "PTA TRAINING MANUAL",

1992.

4.M.J. Donachie, JR., "SuperalloysìSource

Book", ASM, 1984.

5.B. Jahnke, Welding Journal, November l982,

343s-347s.

6.H.E. Boyer and T.L. Gall, "Metals

Handbook", 1985.

7.E. Craig, Welding Journal, February 1988,

19-25.

8.J.F. Lancaster, "Metallurgy of Welding",

1993.

9.P. Burgardt and C.R. Heiple, Welding

Journal, June 1986, l50s-155s.

10.Kou Sindo, "Welding Metallurgy", 1987.

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