DE2211830A1 - PROCESS FOR PROTECTING THE BLADE OF AN AXIAL FLOW TURBO MACHINE AGAINST STRESS CORROSION - Google Patents
PROCESS FOR PROTECTING THE BLADE OF AN AXIAL FLOW TURBO MACHINE AGAINST STRESS CORROSIONInfo
- Publication number
- DE2211830A1 DE2211830A1 DE2211830A DE2211830A DE2211830A1 DE 2211830 A1 DE2211830 A1 DE 2211830A1 DE 2211830 A DE2211830 A DE 2211830A DE 2211830 A DE2211830 A DE 2211830A DE 2211830 A1 DE2211830 A1 DE 2211830A1
- Authority
- DE
- Germany
- Prior art keywords
- blade
- stress corrosion
- protecting
- hardened
- cross
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
19/7219/72
Aktiengesellschaft Brown, Boveri & Cie., Baden (Schweiz)Public limited company Brown, Boveri & Cie., Baden (Switzerland)
Verfahren zum Schutz der Laufschaufel einer axial durchström-, ten Turbomaschine gegen Spannungsrisskorrosion. '■'"'*'■'- Method for protecting the rotor blade of an axially flowed through , th turbo machine against stress corrosion cracking. '■'"'*' ■ '-
Die Erfindung betrifft ein Verfahren zum Schutz der gehärteten Eintrittskante der Laufschaufel einer axial durchströmten Turbomaschine gegen Spannungsrisskorrosion. --..-.■>.The invention relates to a method for protecting the hardened leading edge of the rotor blade of a turbomachine through which there is an axial flow against stress corrosion cracking. --..-. ■>.
Zum Schutz gegen Erosion werden die Eintrittskanten der Schaufeln von axial durchströmten Turbomasehinen gehärtet. Dies kann beispielsweise durch Flammhärtung oder mit Hilfe von Induktionswärme durch Hochfrequenz erfolgen. To protect against erosion, the leading edges of the blades are hardened by turbo machines with an axial flow. This can for example by flame hardening or with the help of induction heat by high frequency.
Gehärteter Stahl ist aber anfälliger gegen Spannungsrisskorrosion als ungehärteter Stahl. Dies trifft besonders bei legierten Stählen zu, z.B. beim rostfreien 12#-igen Chromstahl» Diese An-However, hardened steel is more susceptible to stress corrosion cracking than unhardened steel. This is particularly true of alloys Steels, e.g. in the case of stainless 12 # chrome steel »This
3 0 9 8 3 4 / 0 3 U3 0 9 8 3 4/0 3 U
- 2 - 19/72- 2 - 19/72
fälligkeit hängt unter anderem von der Zusammensetzung und dem. Wärmebehandlungszustand des Stahls, von den im strömenden Arr.. beitsmittel enthaltenen Verunreinigungen (z.B. Chloriden) und, von den auf den gefährdeten Teil einwirkenden Zugspannungen abr due date depends, among other things, on the composition and the. Heat treatment condition of the steel, the r of the pouring Ar .. impurities (for example chlorides) beitsmittel contained and, by acting on the vulnerable part of tensile stresses from r
Da eine Laufschaufel im Betrieb durch dJLe Zentrifugalkräfte, Since a rotor blade is in operation due to centrifugal forces,
gegebenenfalls auch durch vom Arbeitsmittel hervorgerufene Kräfte, Zugspannungen unterworfen ist, wird auch eine, gehärtete Kante durch Spannugsrisskorros ion angegriffen. .,.,_,..,,possibly also subjected to tensile stresses caused by the work equipment, it is also hardened Edge attacked by stress crack corrosion. .,., _, .. ,,
Eine Verminderung der mechanischen Spannungen ist durch konstruktive Massnahmen erreichbar, doch ist dies mit Nachteilen wie z.B. schlechterer Aerodynamik verbunden.A reduction in the mechanical stresses can be achieved through structural measures, but this is associated with disadvantages such as poorer aerodynamics.
Der Erfindung liegt die Aufgabe zugrunde, die gehärtete Kante einer Laufschaufel durch technologische Mittel zumindest weitgehend vor Spannungsrisskorrosion zu bewahren. The invention is based on the object of the hardened edge to at least largely protect a rotor blade from stress corrosion cracking by technological means.
Die erfindungsgemässe Lösung dieser Aufgabe besteht darin, dass dem zu härtenden Schaufelteil bei der Härtung eine bleibende Druckvorspannung in Richtung der Schaufellängsächse erteilt wird. The solution to this problem according to the invention is that the blade part to be hardened is given a permanent compressive prestress in the direction of the longitudinal axis of the blade during hardening .
Wird eine nach diesem Verfahren hergestellte Schaufel während des Betriebes durch Zentrifugal- oder andeje Kräfte auf Zug If a blade manufactured according to this method is pulled during operation by centrifugal or other forces
309834/03U309834 / 03U
19/7219/72
beansprucht, so wird der unter Druckvorspannung stehende Schaufelteil gänzlich oder weitgehend druckentlastet und gegebenenfalls in diesem Schaufelteil noch auftretende Zugkräfte sind so gering, dass sie keine merkliche Erhöhung der Spanhungsrisskorrosion verursachen.stressed, the part of the blade which is under compressive prestress becomes Completely or largely relieved of pressure and possibly tensile forces that still occur in this blade part so small that they do not noticeably increase the stress corrosion cracking cause.
Das beschriebene Verfahren kann in einfacher Weise verwirklicht werden. Beim Härten, d.h. bei der Erwärmung auf über 85O C und nachheriger Abkühlung tritt durch die Martensitbildung im Stahl eine Volumenvergrösserung auf. Wird nur ein Teil eines Werkstückes gehärtet, wie es bei der Härtung der Eintrittskante einer Laufschaufel der Fall ist, so entsteht im gehärteten Teil eine Druckvorspannung, wenn der übrige Teil des Werkstückes, der bei der Härtung kalt bleibt, einen genügend grossen Querschnitt aufweist, um die resultierenden Zugspannungen aufzunehmen, ohne plastisch d.h. über die Streckgrenze hinaus verformt zu werden.The method described can be implemented in a simple manner. When hardening, i.e. when heated to over 85 ° C and subsequent cooling occurs through martensite formation in the Stahl increased its volume. If only part of a workpiece is hardened, as is the case with the hardening of the leading edge a rotor blade is the case, a compressive prestress occurs in the hardened part if the remaining part of the workpiece, which remains cold during hardening, has a sufficiently large cross-section to absorb the resulting tensile stresses, without being plastically deformed, i.e. beyond the yield point.
Bei einer Laufschaufel mit langgestrecktem Profil und der Härtung nir an einem Ende liegen die Verhältnisse besonders ungünstig. Es hat sich gezeigt, dass im gehärteten Schaufelteil nur dann mit Sicherheit eine bleibende,, also auch im kalten Zustand vorhandene Druckvorspannung in Richtung der Schaufellängs- In the case of a rotor blade with an elongated profile and hardening only at one end, the conditions are particularly unfavorable. It has been shown that in the hardened blade part only then with certainty a permanent pressure preload in the direction of the blade longitudinal
309834/03U309834 / 03U
- 4 - 19/72- 4 - 19/72
achse auftreten kann, wenn entlang dem Schaufelblatt die Querschnittsfläche dieses Schaufelteils maximal 20$ des Gesamt-Schaufelquerschnitts beträgt. Die restlichen QO% Querschnitts^ fläche des nicht-gehärteten Schaufelteils können dann ohne Verformung die entsprechenden Zugspannungen aufnehmen.axis can occur if along the blade the cross-sectional area of this blade part is a maximum of 20 $ of the total blade cross-section. The remaining QO% cross-sectional area of the non-hardened blade part can then absorb the corresponding tensile stresses without deformation.
In der beiliegenden Zeichnung ist als Ausführungsbeispiel der Erfindung die Schaufel einer axial durchströmten Turbomaschine im Schnitt dargestellt. Der Querschnitt 1 der gehärteten Zone erstreckt sich über die Eintrittskante und einen Teil der Saugseite, der Querschnitt 2 der ungehärteten Zone umfasst den übrigen Teil der Schaufel. Um im Querschnitt 1 bei der Härtung die gewünschte bleibende Druckvorspannung zu erzeugen, beträgt dieser Querschnitt weniger als 20$ des Gesamt-Schaufelquerschnitts, der aus der Summe der Querschnitte 1 und 2 bes,teht.In the accompanying drawing, as an exemplary embodiment of the invention, the blade of an axially flow-through turbomachine is shown shown in section. The cross-section 1 of the hardened zone extends over the leading edge and part of the suction side, the cross-section 2 of the unhardened zone comprises the remaining part of the blade. To in cross-section 1 when hardening To generate the desired permanent compressive preload, this cross-section is less than $ 20 of the total blade cross-section, which consists of the sum of the cross-sections 1 and 2 bes, teht.
309834/031U 309834/031 U
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH237372A CH564147A5 (en) | 1972-02-18 | 1972-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2211830A1 true DE2211830A1 (en) | 1973-08-23 |
Family
ID=4232248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2211830A Pending DE2211830A1 (en) | 1972-02-18 | 1972-03-11 | PROCESS FOR PROTECTING THE BLADE OF AN AXIAL FLOW TURBO MACHINE AGAINST STRESS CORROSION |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3834833A (en) |
| AT (1) | AT316963B (en) |
| BE (1) | BE795520A (en) |
| CA (1) | CA1009125A (en) |
| CH (1) | CH564147A5 (en) |
| DE (1) | DE2211830A1 (en) |
| FR (1) | FR2172727A5 (en) |
| GB (1) | GB1418136A (en) |
| HU (1) | HU165495B (en) |
| NL (1) | NL7302234A (en) |
| SE (1) | SE400579B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19857653C5 (en) * | 1997-12-15 | 2008-02-21 | Kabushiki Kaisha Toshiba, Kawasaki | Blade of a multi-stage steam turbine |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5623503A (en) * | 1979-08-02 | 1981-03-05 | Toshiba Corp | Supercharger |
| JPS61215270A (en) * | 1985-03-15 | 1986-09-25 | 日本特殊陶業株式会社 | Turbine rotor |
| US5120197A (en) * | 1990-07-16 | 1992-06-09 | General Electric Company | Tip-shrouded blades and method of manufacture |
| US5348446A (en) * | 1993-04-28 | 1994-09-20 | General Electric Company | Bimetallic turbine airfoil |
| US5591009A (en) * | 1995-01-17 | 1997-01-07 | General Electric Company | Laser shock peened gas turbine engine fan blade edges |
| US5620307A (en) * | 1995-03-06 | 1997-04-15 | General Electric Company | Laser shock peened gas turbine engine blade tip |
| IL117347A (en) * | 1995-03-06 | 1999-10-28 | Gen Electric | Laser shock peened gas turbine engine compressor airfoil edges |
| DE19546008A1 (en) * | 1995-12-09 | 1997-06-12 | Abb Patent Gmbh | Turbine blade, which is intended for use in the wet steam area of pre-output and output stages of turbines |
| US5742028A (en) * | 1996-07-24 | 1998-04-21 | General Electric Company | Preloaded laser shock peening |
| US6551064B1 (en) | 1996-07-24 | 2003-04-22 | General Electric Company | Laser shock peened gas turbine engine intermetallic parts |
| US6155789A (en) * | 1999-04-06 | 2000-12-05 | General Electric Company | Gas turbine engine airfoil damper and method for production |
| US20130287580A1 (en) * | 2012-04-27 | 2013-10-31 | General Electric Company | Stress corrosion cracking resistance in superalloys |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB195050A (en) * | 1922-03-18 | 1923-07-19 | Bbc Brown Boveri & Cie | Improvements in steam turbine blades, and in the method of manufacturing such blades |
| US2888244A (en) * | 1956-05-24 | 1959-05-26 | Thompson Ramo Wooldridge Inc | Fluid directing member |
| US3148954A (en) * | 1960-06-13 | 1964-09-15 | Haas Irene | Turbine blade construction |
| US3371908A (en) * | 1965-11-02 | 1968-03-05 | Tokyo Shibaura Electric Co | Turbine blading components and process of producing the same |
| AT275283B (en) * | 1967-05-26 | 1969-10-27 | Boehler & Co Ag Geb | Process for the manufacture of turbine blades |
| US3729345A (en) * | 1967-06-11 | 1973-04-24 | Mitsubishi Heavy Ind Ltd | Method for making propellers of high-strength and high-toughness cast steel |
-
0
- BE BE795520D patent/BE795520A/en unknown
-
1972
- 1972-02-18 CH CH237372A patent/CH564147A5/xx not_active IP Right Cessation
- 1972-03-11 DE DE2211830A patent/DE2211830A1/en active Pending
- 1972-12-22 AT AT1098172A patent/AT316963B/en not_active IP Right Cessation
-
1973
- 1973-02-16 NL NL7302234A patent/NL7302234A/xx not_active Application Discontinuation
- 1973-02-16 US US00333156A patent/US3834833A/en not_active Expired - Lifetime
- 1973-02-16 HU HUBO1415A patent/HU165495B/hu unknown
- 1973-02-16 CA CA163,935A patent/CA1009125A/en not_active Expired
- 1973-02-16 SE SE7302242A patent/SE400579B/en unknown
- 1973-02-16 GB GB776073A patent/GB1418136A/en not_active Expired
- 1973-02-16 FR FR7305510A patent/FR2172727A5/fr not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19857653C5 (en) * | 1997-12-15 | 2008-02-21 | Kabushiki Kaisha Toshiba, Kawasaki | Blade of a multi-stage steam turbine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1418136A (en) | 1975-12-17 |
| CA1009125A (en) | 1977-04-26 |
| FR2172727A5 (en) | 1973-09-28 |
| NL7302234A (en) | 1973-08-21 |
| US3834833A (en) | 1974-09-10 |
| CH564147A5 (en) | 1975-07-15 |
| AT316963B (en) | 1974-08-12 |
| AU5228873A (en) | 1974-08-22 |
| HU165495B (en) | 1974-09-28 |
| SE400579B (en) | 1978-04-03 |
| BE795520A (en) | 1973-06-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OD | Request for examination | ||
| OHW | Rejection |