EP0610135B1 - Procédé de traitement thermique après le soudage de deux pièces en acier allié de nuances distinctes - Google Patents
Procédé de traitement thermique après le soudage de deux pièces en acier allié de nuances distinctes Download PDFInfo
- Publication number
- EP0610135B1 EP0610135B1 EP94400217A EP94400217A EP0610135B1 EP 0610135 B1 EP0610135 B1 EP 0610135B1 EP 94400217 A EP94400217 A EP 94400217A EP 94400217 A EP94400217 A EP 94400217A EP 0610135 B1 EP0610135 B1 EP 0610135B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- treatment
- heat treatment
- cycle
- steel
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
-
- 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
- C21D2251/00—Treating composite or clad material
Definitions
- the present invention relates to a method of heat treatment after welding of two pieces in alloy steel of different grades.
- This heat treatment generally consists of a simple tempering at a temperature slightly below the first critical temperature of transformation on heating, called AC 1 .
- This temperature depending on the nature of the steel constituting the welded assembly, is between approximately 550 and 750 ° C. It is carefully chosen to be high enough to have the effects of stress relieving and softening, while nevertheless being limited to avoid exceeding this temperature AC 1 at the start of transformation on heating and even reaching the temperature of the metallurgical income previously undergone by the parts to be joined by welding, so as not to affect the properties of the base metal.
- a treatment temperature a temperature intermediate between the optimal temperatures of the two steels which is therefore too high for the one whose optimal treatment temperature is the lowest or well, more often we use the temperature corresponding to that of the two steels whose temperature optimal treatment is the weakest, so in this case, the temperature is too low for the other steel.
- the present invention thus relates to a new heat treatment process after welding of two alloy steel parts of different grades, the first part, called A, having critical transformation temperatures on heating AC 1 A and AC 3 A and a optimal treatment temperature after welding ⁇ A lower than AC 1 A, the second part, called B, having critical transformation temperatures on heating AC 1 B and AC 3 B, respectively lower than AC 1 A and AC 3 A and a temperature optimal treatment after welding ⁇ B less than AC 1 B and ⁇ A , characterized in that a first thermal treatment cycle is carried out at said temperature ⁇ A followed by a second thermal cycle at a temperature ⁇ B ,, the temperature having dropped below 100 ° C between the two cycles.
- said first cycle of the treatment at the temperature ⁇ A exceeds the temperature AC 1 B, the whole of the treatment thus constituting, for the material B, an intercritical treatment.
- FIGS 1 and 2 are representative diagrams of the treatment method according to the invention.
- Figure 3 is a partial schematic view showing for example, two welded portions of a rotor turbomachine, the two welded portions each being in alloy steel of different grades, serving as a concrete example for the description of the process according to the invention.
- FIG. 1 there is seen a diagram of the thermal treatment of the invention according to a particular embodiment (intercritical treatment). This same diagram is shown in Figure 2.
- the heat treatment consists of two cycles: a first cycle at temperature ⁇ A and a second cycle at temperature ⁇ B.
- the temperature ⁇ A lower than AC 1 A, is the optimal treatment temperature after welding for steel A.
- the invention therefore consists in carrying out this double heat treatment at temperatures ⁇ A and ⁇ B after welding two pieces of alloy steel of respective grades A and B, with the temperature falling below 100 ° C. between the two treatments at temperatures ⁇ A and ⁇ B.
- this double cycle at ⁇ A and ⁇ B has the same effect as a simple treatment at temperature ⁇ A corresponding to the optimal temperature of heat treatment after welding for this steel and the second cycle at ⁇ B has no effect.
- a double cycle of this type, for steel B, is a so-called “intercritical” processing which is capable of generating very ductile micrographic structures.
- At least the first thermal cycle at ⁇ A ° C is a local treatment, that is to say only affecting the deposited metal and the base metal immediately adjacent on either side.
- the material B outside of the waiting weld is not affected by the intercritical treatment and retains its initial properties.
- Figure 3 describes an application of the method of the invention to a turbine rotor.
- HP-BP a rotor rotor
- the heat treatment applied is a local treatment affecting only welded joint 1 and weld expectations 2 and 3 which have been delimited in the figure by the two dashed lines 4 and 5.
- Part A HP in its entirety, and the metal deposited 1, will retain their characteristics after this double cycle normal mechanical.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Arc Welding In General (AREA)
Description
- supprimer ou au moins réduire les contraintes internes d'origine thermiques apparues au cours du refroidissement, et de la solidification conséquente du joint soudé,
- adoucir le métal fondu et la zone avoisinante du métal de base également affectée thermiquement, afin d'améliorer la ductilité de ces zones qui est très médiocre à l'état brut de soudage.
C = 0,23
Ni = 0,6
Cr = 1
Mo = 1
V = 0,3
pour cet acier, la température AC1(A) est de 750°C et la température AC3(A) est de 900°C, sa température A optimale de traitement après soudage est de 670°C.
ayant la composition suivante :
C = 0,23
Ni = 3,0
Cr = 1,75
Mo = 0,5
V = 0,1
ses températures
AC1 (B) = 630°C
AC3 (B) = 810°C B = 600°C
Re = 680 MPa
Rm = 800 MPa
Re = 500 MPa Rm = 650 MPa
Re = 500 MPa
Rm = 650 MPa
ce qui est parfaitement admissible, puisque ces caractéristiques sont celles de l'autre attente de soudure 2, côté HP, soumise aux mêmes contraintes en service.
Claims (3)
- Procédé de traitement thermique après le soudage de deux pièces en acier allié de nuances distinctes, la première pièce, appelée A, ayant des températures critiques de transformation au chauffage AC1A et AC3A et une température optimale de traitement de revenu après soudage A inférieure à AC1A, la deuxième pièce, appelée B, ayant des températures critiques de transformation au chauffage AC1B et AC3B, respectivement inférieures à AC1A et AC3A et une température optimale de traitement de revenu après soudage B inférieure à AC1B et à A, caractérisé en ce que l'on fait un premier cycle thermique de traitement à ladite température A suivi d'un second cycle thermique à une température B, la température étant descendue au dessous de 100°C entre les deux cycles.
- Procédé de traitement thermique selon la revendication caractérisé en ce que ledit premier cycle du traitement, à la température A dépasse la température AC1B, l'ensemble du traitement constituant ainsi, pour le matériau B, un traitement intercritique.
- Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que, au moins le premier cycle du traitement n'affecte que le métal d'apport déposé (1) et les parties immédiatement avoisinantes (2, 3) des deux pièces soudées (A, B).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9301305A FR2701272B1 (fr) | 1993-02-05 | 1993-02-05 | Procédé de traitement thermique après le soudage de deux pièces en acier allié de nuances distinctes . |
| FR9301305 | 1993-02-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0610135A1 EP0610135A1 (fr) | 1994-08-10 |
| EP0610135B1 true EP0610135B1 (fr) | 1999-10-20 |
Family
ID=9443785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94400217A Expired - Lifetime EP0610135B1 (fr) | 1993-02-05 | 1994-02-02 | Procédé de traitement thermique après le soudage de deux pièces en acier allié de nuances distinctes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5407497A (fr) |
| EP (1) | EP0610135B1 (fr) |
| DE (1) | DE69421198T2 (fr) |
| FR (1) | FR2701272B1 (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2126453C1 (ru) * | 1998-02-02 | 1999-02-20 | Общество с ограниченной ответственностью Научно-производственное предприятие "Валок-Чугун", Ветер Владимир Владимирович | Способ термической обработки сварных соединений |
| GB2344549A (en) * | 1998-12-02 | 2000-06-14 | Siemens Plc | Welding method for two different types of steel |
| US6499946B1 (en) | 1999-10-21 | 2002-12-31 | Kabushiki Kaisha Toshiba | Steam turbine rotor and manufacturing method thereof |
| WO2004051056A1 (fr) * | 2002-12-05 | 2004-06-17 | Siemens Aktiengesellschaft | Arbre de turbine et realisation d'un arbre de turbine |
| EP1561827A1 (fr) * | 2004-02-06 | 2005-08-10 | Alstom Technology Ltd | Méthode de soudage d'un acier ferritique comprenant, après le soudage, un traitement thermique suivi par un travail à froid de la soudure |
| EP1785585B1 (fr) * | 2005-11-09 | 2009-03-11 | Siemens Aktiengesellschaft | Procédé de fabrication d'un arbre pour une turbine à vapeur |
| DE102010043837A1 (de) * | 2010-11-12 | 2012-05-16 | Hilti Aktiengesellschaft | Schlagwerkskörper, Schlagwerk und Handwerkzeugmaschine mit einem Schlagwerk |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61174335A (ja) * | 1985-01-28 | 1986-08-06 | Nippon Steel Corp | 靭性の優れた掘削用ドリルパイプの製造法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR673222A (fr) * | 1928-04-02 | 1930-01-13 | Thomson Houston Comp Francaise | Perfectionnements apportés au traitement des fontes malléables |
| US2133926A (en) * | 1936-06-13 | 1938-10-18 | Texas Co | Heat treatment of welded joints |
-
1993
- 1993-02-05 FR FR9301305A patent/FR2701272B1/fr not_active Expired - Fee Related
-
1994
- 1994-02-01 US US08/189,741 patent/US5407497A/en not_active Expired - Lifetime
- 1994-02-02 EP EP94400217A patent/EP0610135B1/fr not_active Expired - Lifetime
- 1994-02-02 DE DE69421198T patent/DE69421198T2/de not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61174335A (ja) * | 1985-01-28 | 1986-08-06 | Nippon Steel Corp | 靭性の優れた掘削用ドリルパイプの製造法 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69421198D1 (de) | 1999-11-25 |
| FR2701272B1 (fr) | 1995-03-31 |
| US5407497A (en) | 1995-04-18 |
| EP0610135A1 (fr) | 1994-08-10 |
| DE69421198T2 (de) | 2000-05-25 |
| FR2701272A1 (fr) | 1994-08-12 |
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