US20140271332A1 - Method of Manufacturing Cold-rolled Magnesium Alloy Sheet for Improving Formability and Cold-rolled Magnesium Alloy Sheet Having Improved Formability Manufactured thereby - Google Patents

Method of Manufacturing Cold-rolled Magnesium Alloy Sheet for Improving Formability and Cold-rolled Magnesium Alloy Sheet Having Improved Formability Manufactured thereby Download PDF

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Publication number
US20140271332A1
US20140271332A1 US14/189,549 US201414189549A US2014271332A1 US 20140271332 A1 US20140271332 A1 US 20140271332A1 US 201414189549 A US201414189549 A US 201414189549A US 2014271332 A1 US2014271332 A1 US 2014271332A1
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Prior art keywords
magnesium alloy
sheet
cold
rolled
alloy sheet
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US14/189,549
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English (en)
Inventor
Se-jong Kim
Young-Seon Lee
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Korea Institute of Machinery and Materials KIMM
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Korea Institute of Machinery and Materials KIMM
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Assigned to KOREA INSTITUTE OF MACHINARY AND MATERIALS reassignment KOREA INSTITUTE OF MACHINARY AND MATERIALS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, SE-JONG, LEE, YOUNG-SEON
Publication of US20140271332A1 publication Critical patent/US20140271332A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/04—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B21B2001/383—Cladded or coated products

Definitions

  • the present invention relates generally to a method of manufacturing a cold-rolled magnesium alloy sheet for improving formability and a cold-rolled magnesium alloy sheet having improved formability manufactured thereby, and more particularly, to a method of manufacturing a cold-rolled magnesium alloy sheet using a composite sheet including a restrainer functioning to suppress transverse plastic deformation of a magnesium alloy sheet so as to improve formability and a cold-rolled magnesium alloy sheet having improved formability manufactured thereby.
  • a variety of sheet-working processes such as a press working are being used for the production of sheets in industrial fields such as automobiles and aircrafts.
  • a sheet workpiece partially or completely undergoes a complicated deformation such as stretching, bending, flanging, deep drawing or combinations thereof.
  • formability which indicates a degree to which a sheet can be plastically deformed without fracture, is critical above all physical properties.
  • the magnesium alloy does not have a sufficient number of slip systems but has a limited number of active slip systems because it has a hexagonal close packing crystal structure.
  • the slip system in the basal texture which is formed in the magnesium alloy by hot-rolling or extrusion, has a Schmid factor close to zero for a deformation along a c-axis, formability at an ambient temperature is deteriorated which inhibits its extensive applications.
  • an object of the present invention is to provide a method of manufacturing a cold-rolled magnesium alloy sheet for improving formability and a cold-rolled magnesium alloy sheet having improved formability manufactured thereby.
  • the present invention provides a method of manufacturing a cold-rolled magnesium alloy sheet for improving formability, comprising: (a) preparing a composite sheet which is composed of a main sheet made of magnesium alloy and a restrainer made of steel and functioning to suppress transverse plastic deformation (plastic deformation in a transverse direction) of the main sheet during a rolling process, (b) performing a cold-rolling of the composite sheet, and (c) separating the cold-rolled magnesium alloy sheet from the cold-rolled composite sheet obtained from (b).
  • the present invention provides a cold-rolled magnesium alloy sheet having improved formability manufactured by the method.
  • FIG. 1 is a schematic view illustrating an embodiment of a composite sheet used in a method of manufacturing a cold-rolled magnesium alloy sheet for improving formability, according to the present invention
  • FIGS. 2A to 2C are optical photomicrographs which show microscopic textures at a center point, a 1 ⁇ 4 point and an edge point positioned in a transverse direction (TD) across an end face of the specimen prepared in an example, in which the end face is perpendicular to the rolling direction (RD);
  • FIGS. 3A and 3B are an inverse pole figure (IPF) map in a normal direction and a (0001) pole figure which are taken at an edge area of an end face of the specimen prepared in the example using an electron back scatter diffraction (EBSD), in which the end face is perpendicular to the rolling direction (RD);
  • EBSD electron back scatter diffraction
  • FIG. 4 is a graph showing tension test results of magnesium alloy specimens prepared in an example according to the present invention and in a comparative example.
  • FIG. 5 is a graph showing a limit dome height (LDH) results of the magnesium alloy specimens prepared in the example according to the present invention and in the comparative example.
  • LDH limit dome height
  • a method of manufacturing a cold rolled magnesium alloy sheet for improving formability comprises (a) preparing a composite sheet which is composed of a main sheet made of magnesium alloy and a restrainer made of steel and functioning to suppress transverse plastic deformation (plastic deformation in a transverse direction) of the main sheet during a rolling process, (b) performing a cold-rolling of the composite sheet, and (c) separating the cold-rolled magnesium alloy sheet from the cold-rolled composite sheet obtained from the operation (b).
  • Operation (a) of a method according to the present invention is performed in order to produce a composite sheet which is composed of a main sheet made of magnesium alloy and a restrainer made of steel and functioning to suppress transverse plastic deformation (deformation in a transverse direction) of the main sheet during a rolling process.
  • the composite sheet is defined as sheet-shaped product composed of different kinds of materials, that is, magnesium and steel, in which the different materials are separately prepared and then coupled to each other thus providing the sheet-shaped product.
  • the magnesium sheet which is the target to be formed through a cold-rolling process, is coupled to a restrainer that functions to suppress plastic deformation in a transverse direction (MD) perpendicular to a rolling direction (RD) during cold-rolling process, with the result that the magnesium sheet is contained in the composite sheet according to the present invention.
  • MD transverse direction
  • RD rolling direction
  • the restrainer may have any appropriate shape without any limitation as long as it can apply a compressive stress which is capable of suppressing plastic deformation in a transverse direction of the magnesium sheet during a rolling process.
  • operation (a) may be fulfilled in such a way that a restrainer 3 having a groove is prepared by processing a hot-rolled sheet, a main sheet 2 is prepared by processing a hot-rolled magnesium alloy sheet to have dimensions corresponding to the shape of the groove, and the magnesium sheet 2 is disposed in the groove of the restrainer 3 .
  • the main sheet 2 may be temporarily bonded to the restrainer 3 such that the final composite sheet can be effectively produced in a cold-rolling operation to be described later.
  • the classes of magnesium alloy constituting the main sheet and steel constituting the restrainer are not limited to any specific class as long as they can be rolled at a desired rolling reduction and stiffness of the steel is higher that of the magnesium alloy.
  • stiffness of the steel constituting the restrainer is higher than that of the magnesium alloy constituting the main sheet, the restrainer will apply a compressive stress against expansion of the magnesium sheet in a transverse direction during a subsequent rolling operation of the composite sheet, and thus rolling properties of the composite sheet can be effectively improved when the cold-rolling operation is performed in operation (b) to be fully described later.
  • Operation (b) of the method according to the present invention which is intended to cold-roll the composite sheet which is prepared in operation (a), may be fulfilled using a well-known rolling machine and a well-known rolling technology.
  • the composite sheet which has been prepared in a manner described in detail above, is cold-rolled. Thanks to this operation (b), edge cracks do not occur even in the magnesium alloy sheet which must be conventionally hot-rolled at a sufficiently high temperature of higher than 230° C. in order to avoid occurrence of cracks, and a sheet, which has an intact and fine texture even when being cold-rolled at a low temperature of lower than 100° C., but higher than ambient temperature, can be produced.
  • the restrainer which is composed of steel, applies a compressive stress to the magnesium alloy sheet in a transverse direction (TD) during a cold-rolling process to thus inhibit occurrence of edge cracks and cause tensile twinning, with the result that a ductility of the sheet can be significantly improved and thus a high-quality sheet can be produced even through a cold-rolling process.
  • TD transverse direction
  • magnesium alloy which is inevitably subjected to a hot-rolling process because it has a low ductility and thus a low workability at an ambient temperature, can also be manufactured into a high-quality sheet. Therefore, it is possible to prevent the shortening of service life of a roll caused by the heating of working material and rolling rolls, and it is possible to reduce production costs owing to energy saving and thus to manufacture an economical and high-quality sheet.
  • Operation (c) of the method according to the present invention which is intended to separate the cold-rolled magnesium alloy sheet from the composite sheet obtained in operation (b), may employ any solution as long as it can separate the cold-rolled magnesium alloy sheet from the restrainer.
  • the cold-rolled magnesium alloy sheet manufactured by the method according to the present invention has an ambient temperature formability which is remarkably improved compared to the magnesium alloy sheet which is not subjected to the cold-rolling process, it is expected that it gives advantages in economic efficiency and simplifies processing in various industrial fields such as automobiles and aircrafts and thus the application field of the magnesium alloy sheet is enormously broadened.
  • the cold-rolled magnesium alloy sheet having an improved formability is characterized in that it has a limit dome height (LDH) at an ambient temperature which is increased by 20% or more, compared to the magnesium alloy sheet which is not subjected to the cold-rolling process.
  • LDH limit dome height
  • LDH which refers to an index which is extensively used to evaluate a press-formability among formability by various processes, is defined in such a way that a disc-shaped specimen having a predetermined dimension is held at a circumference thereof by a certain force, the specimen is deformed by a spherical punch which has a predetermined diameter and moves a predetermined speed, a deformed height of the specimen is taken as the LDH when the specimen is broken.
  • a commercial hot-rolled AZ31 (Al: 3 weight %, Zn: 1 weight %, Mn: 0.3 weight % and Mg: balance) sheet having a thickness of 1.2 mm was processed to prepare a specimen having a dimension of 90 mm ⁇ 12 mm ⁇ 1.2 mm, and a groove was formed between the opposite ends on a side of a hot-rolled steel sheet (C: 0.12 weight %, Si: 0.20 weight %, Mn: 0.87 weight % and Fe: balance).
  • the specimen was fitted in the groove of the steel sheet to prepare a composite sheet having a shape and a structure as shown in FIG. 1 .
  • the composite sheet was homogenized at a low temperature of 100° C. for 20 minutes, and was then cold-rolled at a rolling reduction of 3% using a rolling machine equipped with rolls having a diameter of 250 mm under the conditions of a rolling temperature of 100° C. equal to the homogenization temperature and a rolling speed of 2 rpm. Subsequently, the magnesium alloy specimen was separated from the cold-rolled composite sheet.
  • FIGS. 2A to 2C are optical photomicrographs which show microscopic textures at three points (a center point, a 1 ⁇ 4 point and an edge point) positioned in a transverse direction (TD) across an end face of the specimen prepared in the example, in which the end face is perpendicular to the rolling direction (RD). From the optical photomicrographs, it is ascertained that densities of twinning are similar to each other regardless of measurement location.
  • FIGS. 3A and 3B are an inverse pole figure (IPF) map in a normal direction and a (0001) pole figure which are taken at an edge area of an end face of the specimen prepared in the example using an electron back scatter diffraction (EBSD), in which the end face is perpendicular to the rolling direction (RD). From the figures, it is found that most of twinnings are of ⁇ 10-12 ⁇ tensile twinning. Furthermore, it is also ascertained that a compressive stress was applied to the magnesium alloy sheet in a transverse direction (TD) during the rolling process due to the steel sheet which has a strength higher than the magnesium alloy sheet in a transverse direction (TD), from the fact that face ⁇ 0001 ⁇ was turned in a transverse direction (TD).
  • TD transverse direction
  • a commercial hot-rolled AZ31 (Al: 3 weight %, Zn: 1 weight %, Mn: 0.3 weight % and Mg: balance) sheet having a thickness of 1.2 mm was processed to prepare a specimen having a dimension of 90 mm ⁇ 12 mm ⁇ 1.2 mm.
  • Measurement of tensile strength and formability are measured for the magnesium alloy sheet specimen prepared in the example and the comparative example is executed as follows.
  • a tension test specimen which has a gauge length of 25 mm, a gauge width of 6 mm and a thickness of 1.16 mm was prepared to be configured to be extended in a rolling direction.
  • the tension test was executed at a strain rate of 0.001 s ⁇ 1 and a temperature of 100° C., and then the measurement results were represented in FIG. 4 .
  • a disc-shaped specimen which has a diameter of 50 mm and a thickness 1.16 mm was prepared.
  • the specimen was interposed between upper and lower dies of an LDH test equipment, and was then held by a force of 15 kN. Subsequently, the specimen was deformed by a spherical punch having a diameter of 25 mm which moves toward the specimen at a speed of 0.02 mm/sec. When the specimen was broken, a deformed height of the specimen was measured, and the measurement results were represented in FIG. 5 .
  • the magnesium alloy specimen prepared in the example and the magnesium alloy specimen prepared in the comparative example have tension strengths of 275 MPa and 272 MPa, respectively, which are almost same as each other, whereas yield strengths of both the specimens were 187 MPa and 144 MPa in which the yield strength of the specimen prepared in the example was increased compared to that of the specimen prepared in the comparative example.
  • the cold-rolled magnesium alloy specimen prepared in the example exhibits a remarkable formability which is improved by 23% compared to the magnesium alloy specimen prepared in the comparative example.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US14/189,549 2013-03-13 2014-02-25 Method of Manufacturing Cold-rolled Magnesium Alloy Sheet for Improving Formability and Cold-rolled Magnesium Alloy Sheet Having Improved Formability Manufactured thereby Abandoned US20140271332A1 (en)

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KR10-2013-0026578 2013-03-13
KR1020130026578A KR101502751B1 (ko) 2013-03-13 2013-03-13 향상된 성형성, 항복강도 및 인장강도를 가지는 마그네슘 합금 냉간압연판재의 제조방법 및 이에 의해 제조된 향상된 성형성, 항복강도 및 인장강도를 가지는 마그네슘 합금 냉간압연판재

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3561096A4 (en) * 2016-12-23 2019-10-30 Posco MAGNESIUM ALLOY PLATE AND METHOD FOR MANUFACTURING THE SAME
CN111421013A (zh) * 2020-04-10 2020-07-17 江苏鼎胜新能源材料股份有限公司 一种高频焊接用钎焊扁管复合铝带及其制造方法
CN111678931A (zh) * 2020-06-05 2020-09-18 长沙学院 基于ebsd技术的镁合金拉伸孪晶体积分数的计算方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117066752B (zh) * 2023-10-18 2023-12-19 广州汉源微电子封装材料有限公司 一种高平稳性高可靠性的限高型预成形焊片及其制备方法

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US3122423A (en) * 1960-04-04 1964-02-25 Beryllium Corp Method and apparatus for hot rolling high quality metal sheet
US3827264A (en) * 1966-07-20 1974-08-06 Arco Nuclear Co Method of producing sheets and article to practice such method
US4616393A (en) * 1985-02-01 1986-10-14 The Babcock & Wilcox Company Apparatus and method for rolling a metal matrix composite plate or sheet
US20060231173A1 (en) * 2003-02-28 2006-10-19 Liang Daniel D Magnesium alloy sheet and its production
US20080075624A1 (en) * 2005-05-30 2008-03-27 Osaka University Magnesium alloy sheet processing method and magnesium alloy sheet

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JPH0929462A (ja) * 1995-05-15 1997-02-04 Kobe Steel Ltd 圧延クラッド金属板の製造方法
JP2010064132A (ja) * 2008-09-12 2010-03-25 Toyota Industries Corp 制振材およびその製造方法

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US3122423A (en) * 1960-04-04 1964-02-25 Beryllium Corp Method and apparatus for hot rolling high quality metal sheet
US3827264A (en) * 1966-07-20 1974-08-06 Arco Nuclear Co Method of producing sheets and article to practice such method
US4616393A (en) * 1985-02-01 1986-10-14 The Babcock & Wilcox Company Apparatus and method for rolling a metal matrix composite plate or sheet
US20060231173A1 (en) * 2003-02-28 2006-10-19 Liang Daniel D Magnesium alloy sheet and its production
US20080075624A1 (en) * 2005-05-30 2008-03-27 Osaka University Magnesium alloy sheet processing method and magnesium alloy sheet

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3561096A4 (en) * 2016-12-23 2019-10-30 Posco MAGNESIUM ALLOY PLATE AND METHOD FOR MANUFACTURING THE SAME
JP2020503453A (ja) * 2016-12-23 2020-01-30 ポスコＰｏｓｃｏ マグネシウム合金板、およびその製造方法
US11149330B2 (en) 2016-12-23 2021-10-19 Posco Magnesium alloy plate and method for manufacturing same
CN111421013A (zh) * 2020-04-10 2020-07-17 江苏鼎胜新能源材料股份有限公司 一种高频焊接用钎焊扁管复合铝带及其制造方法
CN111678931A (zh) * 2020-06-05 2020-09-18 长沙学院 基于ebsd技术的镁合金拉伸孪晶体积分数的计算方法

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Effective date: 20140220

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION