DE1483204B2 - PROCESS FOR THE PRODUCTION OF SHEETS FROM MAGNESIUM ALLOYS - Google Patents

Description

Alloy constituents in the appropriate proportions or through the use of intermediate alloys containing the alloy constituents Magnesium. The addition of a saline flux "during the alloying process offers protection against oxidation. The molten alloy 'can optionally through Stir in an additional flux to be remunerated. The thus tempered metal is allowed to settle and separates from the flux, e.g. B. by decanting into a suitable mold such. B. in a rectangular shape for a rolled slab. .

For rolling the cast metal, the billet is peeled to remove surface impurities, then ^{heated as often as necessary to 370 to 480 0} C a first time to prevent cold cracks during the passage, ie during hot rolling from the thickness of the billet to about 2.54 mm.

After the tub through the sheet to '370-510 ⁰ C is heated directly by the rollers ao of the rolling mill taken where a decrease · takes place approximately 15 to 50% mittels'.gdschmierter rollers under a roll pressure and a roll speed run so that the metal exits at a temperature of 150 to 315 ° C. The sheet exiting at this temperature is then aged at 150 to 370 ° C. ;

The following examples illustrate the invention.

Examples

Various alloy masses have been made by melting together the required amount of magnesium, calcium and zinc with or without zirconium or manganese. The masses were cleaned with a flux, allowed to settle and then cast into billets. The rolling ingots were peeled, heated to about 400-455 ⁰ C and hot-rolled, the ingot aim thickness of 5 cm to about 2.54 mm to reduce. The following rolling process followed: The sheet was hot-rolled in order to achieve a 40% reduction in thickness in one pass. The metal sheet entered into the rolls of the rolling mill at a temperature of 370 ⁰ C and leaving them at a temperature of 205 ⁰ C. A portion of the thus-rolled sheet was annealed for 1 hour at 15O ⁰ C to the rolled metal into a ^ - hard state (H-26). A part of the rolled metal sheet was tempered at __260 ° C for 1 hour to bring the metal to the semi-hard state (H-24). Samples of the metal in each state were subjected to mechanical tests. The composition, the artificial aging temperature and the results of the mechanical tests are given in Table 1. The mechanical properties are in each case the lower of the properties either in the longitudinal or in the transverse direction.

Tabel

- test Approx composition
Weight percent *) Mn I Zr. Warm
outsourcing % D Mechanically" : Property owner ZG No. 0.06 Zn _ _ ° c 5 SG I Theatrical Version • 2.52 1 0.06 0.20 - - 150 14th 1.68 1.68 2.24 2 0.05 0.20 - - 260 ' 9 1.26 1.19 2.38 3 0.05 0.4 - - 150 17 - 1.47 1.61. 2.17 - 4th 0.06 0.4 ■ - 260 8th 1.05 1.05 '2.45 5 0.06 -0.5 - - 150 18th 1.47 1.61 2.10 6th 0.09 0.5 - - 260 14th .1.05 0.98 2.24 7th 0.16 0.2 - . - 260 5 1.54 1.33 2.73 8th 0.16 0.4 - - 150 11th 2.03. 2.03 2.45 9 0.16 0.4 - 0.10 260 ' 6th 1.61 1.54 2.87 10 0.16 0.4 0.10 150 12th 2.10 2.10 2.52 11th , 0.13 0.4 - ' - 260 4th 1.75 1.68 2.87 12th 0.13 0.6 '-— -' - 150 14th 2.03 2.10 2.59 13th 0.13 0.6. - 0.20 260 5 . 1.61 ; 1.54 -r 3.01 14th 0.13 0.6 ■ - 0.20 150 11th 2.10 2.24 2.66 15th 0.25 0.6 - . -. 260 4th 1.75 1.75. 2.94 16 0.25 0.2 - ■ - 150 14th 2.17 2.24 2.59 17th 0.25 0.2 0.5 . - 260 5 1.68 1.68 2.73: 18th 0.25 0.2 0.5 ■ '-' 150 11th 1.96 2.03 2.45- 19th 0.25 0.2 0.4 260 5 1.61 1.61 2.80 20th 0.25 0.2 -. ■ 0.4 150 9 2.10 2.03 2.52 21 0.25 0.2 - 260 4th 1.75 1.75 2.94 22nd 0.25. 0.35 - - 150 12th 2.03 2.17 2.59 23 0.25 0.35 - 0.7 260 7th / 1.61 1.61, 2.66 24 0.5 0.63 - 260 10 ^/ 1.75 1.89 2.59 25th 0.2 260 1.68 1.68

*) Remainder magnesium,
% D =% elongation at break,
SG = 0.2 threshold in 1000 kp / cm ^2, KF = compressive strength of 1000 kgf / cm ^2, ZG = tensile strength in 1000 kp / cm ^2.

Other parts of the rolled metal sheet manufactured as above were soft annealed at 370 ° C. for 1 hour (condition 0). Another hot-rolled and solution-annealed sheet was increased in thickness in one pass by 20 or ' 40% reduced when it entered the rolling mill at a temperature of 510 ° C and left it at a temperature of 205 ° C. The thus rolled out metal was 1 hour at 26O ⁰ C started (state T8). Samples of the metal in the 0 and Τ-8 states were subjected to mechanical tests including the test for creep resistance of the metal. The compositions, the rolling conditions and the artificial aging temperature and the mechanical properties of the alloy are shown in Table 2. "..,

IO

For comparison purposes, an alloy with calcium and zinc contents within that of the invention was used Range in which, however, the numerical product of the percentage calcium times the order 0.2 reduced percentage zinc was above the numerical value 0.1, produced in a similar way, cast and rolled to bring the metal into one of the conditions ΙΓ-26, H-24, 0 or T-8. That Metal was difficult to roll and showed serious cracking. ■ '■■ - ■

The mechanical properties of the table are the lower of the properties in either the longitudinal or transverse direction. In any case, they were Percentage creep determined in the longitudinal direction of rolling. The values given for SG and KF result as in Table 1.. -

'· - composition
'"Weight percent *) 0.20 Mn . Zr Table 2 % of
Warm Entry
temperature "Warm
expenses mgF " Mechanical properties ^: 13th SG Theatrical Version ■% Kr. test Ca I Zn 0.20 ι rolling '° C 16 0.91 2.03 0.16 •No. ' 0.06 0.40 - - 20th 510 260 14th 0.63 1.89 0.98 26th 0.06 0.40 - - 40 370 370 18th 0.84 2.03 0.55 27 0.05 0.5 - - 20th 510 . 260 15th 0.56 2.59 RA 28 0.05 0.5. - - 40 370 370 9 0.84 2.03 0.64 29 0.06 0.2 - - 20th 510 260 10 0.56 1.89 RA 30th 0.06 0.2 - - 40 370 370 23 1.12 2.24 0.12 31 0.09 0.40 - - 20th 510 260 11th 0.70 2.59 0.02 32 0.09 0.40 - - 40 370 370 20th 1.12 2.10 0.09 33 0.16 0.40 - '- 20th 510 260 12th 0.84 2.03 0.03 34 0.16 0.40 0.5 - 40 370 370 20th 1.26 2.24 0.10 * 35 0.16 0.40 0.5 - 20th 510 260 10 1.19 2.17 0.02 36 0.16 0.40 - 0.15 40 370 370 20th 1.33 2.24 0.10 37 0.16 0.6 .— 0.15 20th 510 260 10 1.19 2.10 0.02 38 0.16. 0.6 - 40 370 370 20th 1.12 -2.03 0.09 39 0.13 0.6 - - 20th 510 260 10 0.70 1.96 0.06 40 0.13. 0.6 - 0.20 40 370 370 20th 1.47 2.55 0.17. 41 0.13 0.2 - 0.20 20th 510 260. 10 1.26 2.34 0.04 42 0.13 0.2 - - 40 370 370 19th 1.26 2.03 .0.19 43 0.25 0.2 - - 20th 510 260 11th 1.12 2.10 0.04 44 0.25 0.2 0.5 - 40 370 370 20th 1.12 1.96 0.15 45 0.25 0.2 0.5 • - 20th '510 260 10 1.12 2.17 0.02 46 0.25 0.2 0.4 40- 370 370 19th 1.47 2.38 0.19 47 0.25 0.35 - 0.4 20th 510 260 10 1.12 2.24, 0.05 48 0.25 0.35 '- 40 370 370 18th 1.12 2.24 0.10 49 0.25 - - 20th 510 260 0.91 2.10 0.03 50 0.25 40 370 370 51

Difficult to roll

composition

*) Remainder magnesium,. ·

RA = runs away under stress,
% Kr. =% Creep in 100 hours below 560 kp / cm ² at 15O ⁰ C.

0.25 0.63 - ' 1 V, 0.25 0.63 • - ■ —r J Sd ■ 0.25 0.63 0.7 20th 0.25 0.63 0.7 40 0.5 0.2 . -. 20th 0.5 0.2 ■ - . 40

510 260 370 370 510 260 370 370

8th 1.54 2.52 18th 1.33 2.24 - 1.26 2.31 18th 1.47 2.17

0.08
0.04
0.13
0.03

Claims (1)

1 2 which in order to achieve a controllably increased Claim · Toughness, hardness and strength an addition of 0.08 '... up to 0.5% calcium is added, are from the German 's patent 387 278 known. Process for the production of sheet metal from 5 The object of the invention was to provide a magnesium alloy consisting of 0.01 to an improved process for the production of sheet metal with 0.8% calcium, 0.05 to 0.95% zinc and from Develop magnesium alloys,
possibly up to 1.5% manganese or up to This task was carried out with a method for 0.8 ° / ₀ Zirconium, with the proviso that the preparation of sheets of magnesium alloy product of the percentage of calcium times io consisting of 0.01 to 0.8% calcium, from 0.05 to 0.95 ° / o the percentage of zinc reduced by 0.2 zinc and _: if necessary up to 1.5% manganese or in the absence of zirconium and the product up to 0.8% zirconium, the remainder magnesium, dissolved, with the percentage of calcium times the order with the proviso that the product of the percentage 0.35 reduced percentage of zinc in the content of calcium times the 0.2 reduced presence of zirconium does not exceed the value 0.1 15 percent of zinc in the absence of zirconium, the remainder being magnesium wherein the overall value of 0.1 and that the product of the percent indicates that the peeled cast content of calcium times the 0.35 reduced ingot at 370 to 48O ⁰ C for a first time hot- percentage of zinc is 0 , 1 rolled in the presence, annealed for 1 hour at 345 to 510 ° C and from Zirconium does not exceed. This process then a second time, namely by 40%, 20 is characterized in that the shackle-Gußwajmgewalzr is, whereupon the. The last rolling ingot at 370 to -480? C_a first hot-rolled, step annealed at a temperature of 150 to 315 ° C for 1 hour at 345 to 510 ° C and then a leaving sheet is tempered for 1 hour at 150 to 370 ° C for a second time, namely by 40% will. whereupon the last rolling stage with a temperature 35 from 150 to 315 ° C leaving sheet 1 hour at 150 to 370 ° C. .; According to the invention it was found that calcium and zinc containing magnesium alloys reliably without Cracking can be rolled out if the 30 zinc content below 1 ° / o ^ue gt and those specified above Relationships between zinc and calcium content The invention relates to a method of manufacturing be kept. The alloys are by adding of sheet metal made of magnesium alloys, consisting of manganese or zirconium. Important from 0.01 to 0.8% calcium, 0.05 to 0.95% zinc and is that the content of zinc and calcium is adjusted optionally up to 1.5% manganese or up to 35 is that the numerical product of the percent-0.8 % Zirconium, with the proviso that the product contains Calcmm and the percentage reduced by 0.2 the percentage of calcium times the 0.2 content of zinc in the absence of zirconium or that decreased percentage of zinc in the absence of numerical product of the percentage of calcium of zirconium and the product of the percentage and the percentage zinc reduced by 0.35 calcium content times the 40 reduced by 0.35 in the presence of zirconium does not reach the value 0.1 Percentage of zinc in the presence of zirconium: ;; exceeds. More preferred is a value between does not exceed 0.1, the remainder being magnesium. 0.05 and 0.07, with the most favorable value at 0.07 It is known that certain magnesium-calcium lies. Zinc alloys have good cold workability *. The addition of manganese or zirconium is used first, e.g. B. by extrusion 45 improves the static strength of the alloy. By hot working to avoid cracking, ^l and ^: addition of zirconium also improves the machinability of desirable mechanical strength properties of the alloy; it has been found to show when processed without cracking. Presence of zirconium, higher zinc contents. These alloys usually contain 1 to 6 percent by weight zinc without impairing the rollability and show a questionable amount of zinc. cracking and hot brittleness if they are directly advantageous in the process according to the invention are hot-rolled from the castings. Alloys with 0.05 to about 0.5% calcium and From Office Patent No. 755,918 to be used for 0.1-0.5% zinc. A "particularly be-inventions and patents in East Berlin are preferred range is 0.15; up to 0.25% calcium magnesium alloys with 0.05 to 2% zirconium 55 and 0.2 to 0.5% zinc. Within The preferable range, for example up to 7% zinc and up to 1.5% composition ranges, generally leads to higher calcium, which is characterized by good ductility, zinc content and greater strength of the alloy The zinc content of all strength properties by limiting the zinc alloy examples is at least 1%. 60 amount. Alloys show very good properties. Alloys containing manganese are expressed with 0.01 to 0.08% Calcmm, 0.1 up to 0.2% zinc and borrowed from the suitable alloy masses - the remainder essentially magnesium,
closed. The alloys traded by the process according to the invention in US Pat. excellent properties. to improve their properties. Magne- Those which can be used for the method according to the invention sium alloys with zinc and possibly manganese, alloys can be melted together