EP2480693A1 - Acier inoxydable à variations locales de résistance mécanique - Google Patents
Acier inoxydable à variations locales de résistance mécaniqueInfo
- Publication number
- EP2480693A1 EP2480693A1 EP09740179A EP09740179A EP2480693A1 EP 2480693 A1 EP2480693 A1 EP 2480693A1 EP 09740179 A EP09740179 A EP 09740179A EP 09740179 A EP09740179 A EP 09740179A EP 2480693 A1 EP2480693 A1 EP 2480693A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- mechanical strength
- steel sheet
- martensitic
- local
- 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.)
- Granted
Links
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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
-
- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Definitions
- the present invention relates to the forming of stainless steel sheets and more particularly those having high mechanical strengths.
- Stainless steel sheets are widely used in the automotive, construction and general industrial sectors because of their excellent resistance to corrosion.
- these sheets are generally shaped to be used, for example, in the form of profiles, square tubes, bumper beams, stretchers, door frames. These shaping are most often performed by folding, profiling and stamping.
- the minimum bending radii are generally greater than twice the thickness of the sheet (and up to six times) with at best a bending angle not exceeding 120 °, not allowing the manufacture of tubes with small radii of curvature
- US Pat. No. 5,735,163 thus describes a blank shaping process in which a local portion of the blank is cured before shaping. This hardening is generated by a high density energy supply. The resulting rise in temperature results in the transformation of the local microstructure into martensite or bainite, which locally increases the mechanical strength. In the case of a stamping, the formation of hardened lines parallel to the direction of the deformation makes it possible to avoid the breaking of indefinable shades.
- this process solves only one of the problems mentioned above.
- this process can not be applied to steels having a high mechanical strength, already sufficiently difficult to implement.
- this process assumes the use of steels capable of undergoing a martensitic or bainitic phase transformation during annealing followed by quenching, which in fact limits its use to carbon-manganese steels.
- the present invention aims to facilitate the forming of stainless steel sheets having a high mechanical strength. It has been designed and realized to overcome the defects presented previously and to obtain other advantages.
- the invention firstly relates to a stainless steel sheet containing a minimum of 10.5% by weight of Cr and a maximum of 1.2% by weight of C, the microstructure of which is martensitic or austenitic. martensitic and comprises at least 2% by volume of martensite.
- This sheet is essentially characterized in that it comprises at least one local portion of lower mechanical strength, having a martensite rate at least 10% lower than that of the remainder of said sheet; said local portion being at least partially of a thickness equal to that of said sheet.
- the steel sheet according to the invention can also comprise the following optional characteristics, taken separately or in combination:
- the local portion of lesser mechanical strength has a width between e and 25e on the surface of said sheet.
- the mechanical strength at break of the steel sheet is greater than or equal to 850 MPa outside said local portion.
- the local portion of lower strength has a martensite rate at least two times lower than the rest of the sheet and preferably at least four times lower than the rest of the sheet.
- a second subject of the invention consists of a method of manufacturing a steel sheet according to the invention, essentially comprising the steps according to which:
- Austenitic, martensitic or austeno-martensitic steel sheet is supplied, said steel being a stainless steel containing a minimum of 10.5% by weight of Cr and a maximum of 1.2% by weight of C
- At least one local portion of said sheet is treated so as to obtain a local portion of least mechanical strength, having a martensite at least 10% lower than the remainder of said sheet; said local portion being at least partially of a thickness equal to that of said steel sheet.
- the method according to the invention may also include the following optional feature:
- a third object of the invention consists of a steel part obtainable by deformation of a steel sheet according to the invention or of a sheet obtained by the method according to the invention, said deformation taking place in at least one of said local portions of lower mechanical strength.
- the part according to the invention may also include the following optional features:
- the terms 2H, C700 to C 1300 (so-called hardened state), 1E, 1D, 2B, 2D, 2R, 2E (so-called annealed condition) refer in particular to the standards which define the production ranges and the technical delivery conditions of the products. concerned steels (NF EN 10088-1 and -2 for stainless steels). C1500 will designate a range of manufacture of a 2H hardened nut ensuring a mechanical strength higher than 1500MPa.
- the stainless steel sheets considered by the present invention are characterized by their mechanical strength. This is controlled on the one hand by the addition elements, but also by the heat treatments and the mechanical treatments that the sheet can undergo.
- stainless steel with an austenitic structure is understood to mean a sheet comprising in weight percentage:
- Heat treatment and mechanical treatment allow, in turn, to modify this mechanical strength in a certain proportion.
- the present invention considers in particular two possible variants:
- a homogeneous work hardening (production range 2H: C700 to C1500) on the entire sheet results in a partial transformation of the austenite to martensite and possibly a hardening of the austenite by densification. of the dislocation network.
- This hardening achieves mechanical strengths well above 780 MPa, maximum value achievable on a stainless steel annealed type 1D, 1 E, 2B, 2D, 2E, 2R.
- the steel thus worked is of austeno-martensitic structure that is to say formed at ordinary temperature of a mixture of austenite and martensite, the volume fraction of martensite being at least 2%.
- a localized heat treatment to the zones to be deformed causes a partial reversion of the martensite to austenite and possibly a softening of the austenite by reducing the number of dislocations.
- This heat treatment makes it possible to lower the mechanical resistance of the sheet locally. A portion of lower mechanical strength is thus obtained.
- This mechanical resistance can be lowered up to 500 MPa, the minimum achievable on annealed austenitic stainless steel.
- This heat treatment can be performed without this list being exhaustive, by laser, by induction, by electron beam or by welding with the wheel.
- the thermal cycle includes in particular a temperature rise above the transformation start temperature of martensite to austenite, called reversion temperature of martensite.
- This temperature is a function of the grade of steel considered but within the scope of the invention, and to cover all the austenitic grades, the reversion temperature is higher than 550 ° C.
- the durations of the heat treatment, heating, maintenance and cooling are a function of the grade of the sheet, its thickness and the method used: they must be determined beforehand and must allow a minimum decrease of 10% of the volume fraction of martensite and possibly the dislocation density. This minimal decrease makes it possible to overcome the local variations inherent in the cold-working process. A partial melting of the steel on the surface of the sheet and on a thickness not exceeding 0,5e is admissible.
- the heat treated area is quenched by self-cooling, the heat being transmitted to the surrounding areas. This phenomenon eliminates the control of quenching parameters for obtaining a sheet according to the invention.
- a cold-working is carried out using structured rolling rolls.
- the hardening of stainless steels is usually achieved using smooth rollers.
- these rolls are etched or grooved so that portions of the work-hardened sheet are spared by this work hardening and thus retain their austenitic structure less work hardened.
- This specific hardening is referred to as differential hardening. Portions of lesser mechanical strength are thus obtained.
- the operating conditions are controlled so as to comply with the following conditions:
- the portion of least mechanical strength is at least partially of thickness equal to the thickness e of the sheet
- the portion of least mechanical strength includes the zone that could be deformed during a subsequent shaping step.
- the portion of least mechanical strength is preferably of a width between e and 25 e, This portion may have various shapes, be linear, curvilinear, have a closed contour or may have intersections with other portions of lesser mechanical strength.
- This portion has a lower martensite rate of at least 10% that of the rest of the sheet.
- a stainless steel sheet according to the invention may be shaped according to the usual techniques well known to those skilled in the art, among which may be mentioned as examples folding, profiling, stamping. During this shaping, the portion of lower mechanical strength, which encompasses the deformed zone undergoes hardening. A partial transformation of the austenite into martensite and possibly a hardening of the austenite by densification of the dislocation network make it possible to recover at least partially the initial microstructure of this portion of the sheet.
- a steel piece, shaped at the level of at least one of the lower strength portions of a steel sheet according to the invention is characterized by the presence, in the vicinity of the neutral fiber, of a zone having a martensite rate lower than that of the sheet.
- the detection of this zone can be made by measurement of residual stresses or by measurement of the martensite fraction.
- neutral fiber is meant the set of points which, in case of application of a global deformation, do not undergo local deformation.
- a piece of steel, shaped at the level of at least one of the portions of least mechanical strength of a steel sheet according to the invention, allows:
- the local portions of lesser mechanical strength may not be shaped and serve as preferential zones of deformation during a dynamic stress, typically at deformation rate of between 1 and 1000s "1 as the crash.
- FIGS. 1 to 7 which represent:
- FIG. 1A Example of microstructure of a sheet according to the invention before localized heat treatment. Metallographic section with electrolytic attack.
- FIG. 1C Example of microstructure of a sheet according to the invention after localized heat treatment. Metallographic section with electrolytic attack. - Figure 1 D: Magnification of Figure 1C. Detail of the untreated area.
- FIG. 7A first embodiment of a sheet according to the invention
- the measurement of the martensite ratio is performed by a local measurement of the magnetic induction using a ferritescope. This measurement gives an average percentage by volume of martensite on the thickness of the sheet.
- This indirect measurement assumes the use of a corrective factor depending on the grade of steel considered. In the case of 1.4318 (301 LN) or 1.4310 (301) stainless steel, the corrective factor is 1, 7.
- a direct measurement by sigmametry (saturation magnetic induction) is also possible, although more restrictive to implement. Examples
- a sheet 1 of stainless steel according to the invention is treated locally so as to obtain four linear portions 3 of lesser mechanical strength.
- sheet 1 described above is folded at portions 3 of least mechanical strength so as to obtain profiled steel piece 2.
- a sheet 11 of stainless steel according to the invention is treated locally so as to obtain linear portions 13 of lesser mechanical strength.
- the plate 11 previously described is folded at four portions 13 of lesser mechanical strength so as to obtain the profiled steel piece 12.
- the portions 13 of least mechanical strength that are not shaped have a provision guiding the deformation of the profiled steel piece 12 during a crash-type dynamic stress.
- a sheet 21 of stainless steel according to the invention is treated locally so as to obtain a portion 23 of lesser mechanical strength.
- the sheet 21 previously described is stamped at the portion 23 of least mechanical strength so as to obtain the piece of steel 22.
- a stainless steel sheet 31 according to the invention treated locally so as to obtain portions 33 of lesser mechanical strength is profiled by means of a profiling line 34 so as to obtain a part of profiled steel 32.
- a steel coil 46 is unwound and subjected to local heat treatment by means of a laser 45 so as to obtain a stainless steel plate 41 according to the invention having four linear portions 43 of lesser mechanical resistance.
- a sheet of stainless steel 51 according to the invention undergoes local heat treatment by means of a laser 55 so as to obtain four linear portions 53 of lesser mechanical strength.
- a hardened stainless steel 1.4318 (301 LN) is used such that its mechanical strength Rm (conventional stress maximum tensile strength) of at least 1000 MPa (state C1000 of the manufacturing range 2H according to EN 10088/2).
- Rm conventional stress maximum tensile strength
- the thickness of the sheet is 0.8 mm and the metal contains about 45% by volume of martensite and 55% by volume of austenite.
- a localized heat treatment is carried out using a CO 2 type laser of 4kW.
- the power in this case is 20%
- the displacement of the source is 0.85m / min (1m / min also tested)
- the focal point is located 25mm above the upper surface of the sheet .
- the laser treatment makes it possible to obtain, along the treatment line, an annealed structure in which the percentage of martensite passes to a content of less than 10% and even 1.5% in the center, close to the annealed state of this metal, that is to say before hardening (state 2B).
- the structure of the treated line comprises an austenitic melted zone limited in width L_zf at 2-4 times the thickness of the sheet and depth P_zf less than 50% of the thickness of the sheet as well as a heat affected zone of a width L_zat between 3 and 6 times the thickness of the sheet.
- This area underwent an almost total reversion of martensite.
- the set of two identified areas constitutes the portion of least mechanical strength.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Forging (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200931904T SI2480693T1 (sl) | 2009-09-21 | 2009-09-21 | Nerjavno jeklo z lokalnimi spremembami mehanske odpornosti |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2009/001110 WO2011033180A1 (fr) | 2009-09-21 | 2009-09-21 | Acier inoxydable à variations locales de résistance mécanique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2480693A1 true EP2480693A1 (fr) | 2012-08-01 |
EP2480693B1 EP2480693B1 (fr) | 2018-09-12 |
Family
ID=41263635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09740179.8A Not-in-force EP2480693B1 (fr) | 2009-09-21 | 2009-09-21 | Acier inoxydable à variations locales de résistance mécanique |
Country Status (10)
Country | Link |
---|---|
US (1) | US20120237387A1 (fr) |
EP (1) | EP2480693B1 (fr) |
JP (1) | JP2013505364A (fr) |
KR (1) | KR20120095364A (fr) |
CN (1) | CN102741432B (fr) |
BR (1) | BR112012006324A2 (fr) |
ES (1) | ES2704643T3 (fr) |
MX (1) | MX2012003385A (fr) |
SI (1) | SI2480693T1 (fr) |
WO (1) | WO2011033180A1 (fr) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5152387B2 (ja) * | 2010-10-14 | 2013-02-27 | Jfeスチール株式会社 | 耐熱性と加工性に優れるフェライト系ステンレス鋼 |
CN103459616B (zh) * | 2011-03-30 | 2016-03-16 | 塔塔钢铁荷兰科技有限责任公司 | 热处理带涂层金属条带的方法及热处理的带涂层金属条带 |
MX368291B (es) | 2012-09-06 | 2019-09-26 | Etxetar Sa | Procedimiento y sistema para el endurecimiento por laser de una superficie de una pieza de trabajo. |
CN103658265A (zh) * | 2013-11-28 | 2014-03-26 | 浙江鸿峰铝业有限公司 | 一种带弯曲度背钢板的制造方法 |
EP3145654A4 (fr) * | 2014-05-23 | 2018-01-17 | Adient Luxembourg Holding S.à r.l. | Formage/durcissement au laser en cours de procédé de structures et composants de siège de véhicule |
DE102014226542A1 (de) * | 2014-12-19 | 2016-06-23 | Bayerische Motoren Werke Aktiengesellschaft | Pressgehärtetes Blechbauteil mit wenigstens einer Sollbruchstelle, sowie Bauteilverbund und Kraftfahrzeugkarosserie mit solchem Blechbauteil |
CA2979927C (fr) | 2015-03-17 | 2023-03-28 | Ikergune A.I.E. | Procede et systeme de traitement thermique de toles |
EP3173504A1 (fr) * | 2015-11-09 | 2017-05-31 | Outokumpu Oyj | Procédé de fabrication d'un composant d'acier austenitique et utilisation dudit composant |
JP2017115186A (ja) * | 2015-12-22 | 2017-06-29 | 東來精密金屬股▲ふん▼有限公司 | 高強度ステンレス極細線の製造方法 |
KR101758517B1 (ko) * | 2015-12-23 | 2017-07-14 | 주식회사 포스코 | 강판 열처리 장치 및 방법 |
JP6846273B2 (ja) * | 2017-04-20 | 2021-03-24 | 株式会社アマダ | レーザ加工機、曲げ加工方法、及び打ち抜き加工方法 |
WO2020049344A1 (fr) * | 2018-09-07 | 2020-03-12 | Arcelormittal | Procédé d'amélioration de l'aptitude au formage d'ébauches d'acier |
BR112021010278B8 (pt) * | 2018-12-06 | 2023-11-21 | Aperam | Aço inoxidável, produtos siderúrgicos em aço inoxidável e métodos de fabricação do produto siderúrgico em aço inoxidável |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5811284B2 (ja) * | 1979-04-17 | 1983-03-02 | 安田 克彦 | 深絞り成形方法 |
JPH01259118A (ja) * | 1988-04-07 | 1989-10-16 | Toyota Motor Corp | プレス成形用粗材 |
JPH0472010A (ja) * | 1990-07-09 | 1992-03-06 | Toyota Motor Corp | 高強度プレス成形品 |
EP0585843A3 (en) * | 1992-08-28 | 1996-06-26 | Toyota Motor Co Ltd | High-formability steel plate with a great potential for strength enhancement by high-density energy treatment |
JPH08117879A (ja) * | 1994-08-29 | 1996-05-14 | Toyota Motor Corp | プレス加工方法 |
JP3305952B2 (ja) * | 1996-06-28 | 2002-07-24 | トヨタ自動車株式会社 | センターピラーリーンフォースの高周波焼入れ強化方法 |
JP2000036409A (ja) * | 1998-05-11 | 2000-02-02 | Hitachi Metals Ltd | アクチュエ―タ用複合磁性部材およびアクチュエ―タ用複合磁性部材の強磁性部の製造方法ならびにアクチュエ―タ用複合磁性部材の非磁性部の形成方法 |
MY120831A (en) * | 1998-12-08 | 2005-11-30 | Sumitomo Metal Ind | Martensitic stainless steel products. |
FR2864108B1 (fr) * | 2003-12-22 | 2006-01-27 | Ugine Et Alz France | Tole en acier inoxydable presentant une grande resistance et un bon allongement, et procede de fabrication |
CN100455681C (zh) * | 2004-05-14 | 2009-01-28 | 中国第一汽车集团公司 | 用工件夹持法对薄壁件端面局部进行激光表面硬化处理的方法 |
DE102006059885A1 (de) * | 2006-12-19 | 2008-06-26 | Volkswagen Ag | Bauteil, insbesondere für den Kraftfahrzeugbereich |
FI125650B (fi) * | 2007-01-17 | 2015-12-31 | Outokumpu Oy | Menetelmä valmistaa austeniittinen teräskappale |
JP2010236560A (ja) * | 2009-03-30 | 2010-10-21 | Nisshin Steel Co Ltd | 衝撃吸収特性に優れた構造部材の製造方法 |
-
2009
- 2009-09-21 EP EP09740179.8A patent/EP2480693B1/fr not_active Not-in-force
- 2009-09-21 BR BR112012006324-3A patent/BR112012006324A2/pt not_active Application Discontinuation
- 2009-09-21 SI SI200931904T patent/SI2480693T1/sl unknown
- 2009-09-21 MX MX2012003385A patent/MX2012003385A/es not_active Application Discontinuation
- 2009-09-21 ES ES09740179T patent/ES2704643T3/es active Active
- 2009-09-21 KR KR1020127010105A patent/KR20120095364A/ko not_active Application Discontinuation
- 2009-09-21 CN CN200980162400XA patent/CN102741432B/zh not_active Expired - Fee Related
- 2009-09-21 WO PCT/FR2009/001110 patent/WO2011033180A1/fr active Application Filing
- 2009-09-21 JP JP2012530302A patent/JP2013505364A/ja active Pending
- 2009-09-21 US US13/497,155 patent/US20120237387A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2011033180A1 * |
Also Published As
Publication number | Publication date |
---|---|
SI2480693T1 (sl) | 2019-04-30 |
WO2011033180A1 (fr) | 2011-03-24 |
CN102741432A (zh) | 2012-10-17 |
ES2704643T3 (es) | 2019-03-19 |
JP2013505364A (ja) | 2013-02-14 |
MX2012003385A (es) | 2012-07-25 |
KR20120095364A (ko) | 2012-08-28 |
US20120237387A1 (en) | 2012-09-20 |
EP2480693B1 (fr) | 2018-09-12 |
CN102741432B (zh) | 2013-11-13 |
BR112012006324A2 (pt) | 2020-08-11 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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