US3732128A - Heat treatments of die castings under pressure - Google Patents

Heat treatments of die castings under pressure Download PDF

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Publication number
US3732128A
US3732128A US00163480A US3732128DA US3732128A US 3732128 A US3732128 A US 3732128A US 00163480 A US00163480 A US 00163480A US 3732128D A US3732128D A US 3732128DA US 3732128 A US3732128 A US 3732128A
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die casting
pressure
die
heat treatment
alloy
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US00163480A
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C Statham
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Farley Inc
NL Industries Inc
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NL Industries Inc
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Assigned to NATWEST USA CREDIT CORP. reassignment NATWEST USA CREDIT CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FARLEY METALS, INC.,
Assigned to FARLEY, INC. reassignment FARLEY, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 28, 1987 Assignors: FARLEY METALS, INC.
Assigned to BANK OF NEW YORK, THE reassignment BANK OF NEW YORK, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FARLEY INC.
Assigned to FARLEY, INC. reassignment FARLEY, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). RECORDED AT REEL 4739, FRAME 0041 Assignors: NATWEST USA CREDIT CORP.
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Assigned to FARLEY INC. reassignment FARLEY INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). RELEASE OF SECURED PARTY OF INTEREST RECORDED AT REE 5221 FRAME 038-043 ON JUNE 21, 1989 Assignors: BANK OF NEW YORK, THE
Assigned to FARLEY INC. reassignment FARLEY INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 12/28/1987 Assignors: FARLEY METALS, INC., A CORP. OF DE
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    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49972—Method of mechanical manufacture with separating, localizing, or eliminating of as-cast defects from a metal casting [e.g., anti-pipe]

Definitions

  • High temperature heat treatments are usually not employed with dies castings. Temperature treatments of 300 to 500 C. are sometimes used with sand and permanent mold castings or on wrought products. In these treatments, however, only atmospheric pressure is used. The treated metal or alloy is then usually subjected to a low temperature heat treatment of 100 C. to 250 C. to improve the properties of the metal or alloy.
  • Magnesium and aluminum metal and alloy die castings normally cannot be treated at temperatures of 300 C. to 500 C. without forming blisters on the surface of the metal or alloy.
  • a method for improving the mechanical properties of a metallic die casting selected from the group consisting of magnesium and aluminum and alloys thereof which comprises placing the die casting in a closed container, heating the die casting up to 300 C. to 600 C. under a pressure of from 100-10,000 p.s.i. for 1-72 hours and rapidly cooling said die casting while still maintaining the applied pressure.
  • This heat treated die casting is then subjected to a low temperature aging treatment of from 100 C. to 250 C. for 1-72 hours at atmospheric pressure.
  • porous die casting may be heated at 300 C. to 600 C. without forming blisters if pressure of 100-10,000 p.s.i. is employed during heat treatment.
  • Example I In this example an aluminum alloy die casting weighing 200 grns. was placed in an autoclave. The die casting used was A.S.T.M.-SC84A. The die casting was heated to 480 C. at 2000 p.s.i. pressure for four hours.
  • the die casting was cooled rapidly and the pressure was released. This die casting was then subjected to low temperature heat treatment of 175 C. for eight hours at atmospheric pressure.
  • Example II In this run the procedure of Example I was repeated except that the aluminum alloy die casting used was A.S.T.M.-SN122A.
  • the treated die casing was substantially free from blisters.
  • the yield strength of the treated die casting was 60 k.s.i. compared with only 35 k.s.i. for the untreated die casting.
  • Example III In this run a magnesium alloy die casting was used in place of an aluminum alloy.
  • the magnesium alloy die casting was identified as A.'S.T.M.-AZ91B. This particular die casting was pressure heat treated at 400 C. for 20 hours and rapidly cooled followed by the low temperature heat treatment at 175 C. for 24 hours at atmospheric pressure.
  • the final die casting had a greater yield strength than the untreated die casting.
  • a method for treating a metallic die casting selected from the group consisting of a casting of aluminum, magnesium and an alloy thereof, to improve the mechanical properties of said die casting which comprises placing said diecasting in a closed chamber, heating said casting at a temperature from 300 C. to 600 C. under a pressure of from to 10,000 p.s.i. for a period from 1 to 72 hours and after said treatment, rapidly cooling said casting while still under pressure, and then heating said casting of a temperature of from 100 C. to 250 C. for 1 to 72 1,891,234 12/1932 Langenberg 148-131 X hours at atmospheric pressure and subsequently cooling 3,156,974 11/1964 Bobrowsky 1484 X said casting to room temperature. 3,157,540 11/1964 Bobrowsky 148-431 2.

Abstract

METALLIC DIE CASTINGS OF MAGNESIUM, ALUMINUM AND ALLOYS THEREOF ARE SUBJECTED TO A HEAT TREATMENT OF FROM 300* TO 600*C. UNDER A PRESSURE OF FROM 100 TO 10,000 P.S.I. FOLLOWED BY A LOW TEMPERATURE AGING TREATMENT TO IMPROVE THE PROPERTIES OF THE METALS WITHOUT FORMING BLISTERS ON THE DIE CAST PRODUCT.

Description

United States Patent 3,732,128 HEAT TREATMENTS F DIE CASTINGS UNDER PRESSURE Charles D. Statham, Trenton, NJ., assignor to N L Industries, Inc., New York, N .Y. No Drawing. Filed July 16, 1971, Ser. No. 163,480 Int. Cl. C22f 1/04, 1/06 US. Cl. 148159 3 Claims ABSTRACT OF THE DISCLOSURE Metallic die castings of magnesium, aluminum and alloys thereof are subjected to a heat treatment of from 300 to 600 C. under a pressure of from 100 to 10,000 p.s.i. followed by a low temperature aging treatment to improve the properties of the metals without forming blisters on the die cast product.
BACKGROUND OF THE INVENTION High temperature heat treatments are usually not employed with dies castings. Temperature treatments of 300 to 500 C. are sometimes used with sand and permanent mold castings or on wrought products. In these treatments, however, only atmospheric pressure is used. The treated metal or alloy is then usually subjected to a low temperature heat treatment of 100 C. to 250 C. to improve the properties of the metal or alloy.
Magnesium and aluminum metal and alloy die castings normally cannot be treated at temperatures of 300 C. to 500 C. without forming blisters on the surface of the metal or alloy.
SUMMARY OF THE INVENTION A method for improving the mechanical properties of a metallic die casting selected from the group consisting of magnesium and aluminum and alloys thereof which comprises placing the die casting in a closed container, heating the die casting up to 300 C. to 600 C. under a pressure of from 100-10,000 p.s.i. for 1-72 hours and rapidly cooling said die casting while still maintaining the applied pressure. This heat treated die casting is then subjected to a low temperature aging treatment of from 100 C. to 250 C. for 1-72 hours at atmospheric pressure. These two heat treatments in combination improve the mechanical strength of die casting.
DESCRIPTION OF PREFERRED EMBODIMENTS Both magnesium and aluminum metal and alloys thereof when subjected to a die casting operation form a die casting which is porous. This porous metal or alloy normally cannot be heated to a temperature of 300 C. to 600 C. because blisters form on the metallic surface. Blisters begin to form at about 300 C. for magnesium and about 350 C. for aluminum.
It has now been discovered that the porous die casting may be heated at 300 C. to 600 C. without forming blisters if pressure of 100-10,000 p.s.i. is employed during heat treatment.
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This high temperature treatment followed by the low temperature heat treatment produces a die casting with increased mechanical strength properties which heretofore have not been obtained.
In order to describe the instant invention in more detail the following examples are presented:
Example I In this example an aluminum alloy die casting weighing 200 grns. was placed in an autoclave. The die casting used was A.S.T.M.-SC84A. The die casting was heated to 480 C. at 2000 p.s.i. pressure for four hours.
After the heat treatment, the die casting was cooled rapidly and the pressure was released. This die casting was then subjected to low temperature heat treatment of 175 C. for eight hours at atmospheric pressure.
The final die casting after high temperature heat treatment under pressure followed by the low temperature heat treatment was examined for its mechanical strength properties.
It was found that its yield strength was 50 k.s.i. compared to 25 k.s.i. for the untreated alloy die casting. This pressure treated die casting was substantially free from blisters due to the use of the pressure heat treatment.
Example II In this run the procedure of Example I was repeated except that the aluminum alloy die casting used was A.S.T.M.-SN122A.
After the die casting was subjected to the pressure heat treatment followed by the low temperature treatment, the treated die casing was substantially free from blisters. The yield strength of the treated die casting was 60 k.s.i. compared with only 35 k.s.i. for the untreated die casting.
Example III In this run a magnesium alloy die casting was used in place of an aluminum alloy. The magnesium alloy die casting was identified as A.'S.T.M.-AZ91B. This particular die casting was pressure heat treated at 400 C. for 20 hours and rapidly cooled followed by the low temperature heat treatment at 175 C. for 24 hours at atmospheric pressure.
Again after subjecting the die casting to the high temperature and pressure heat treatment followed by the low temperature heat treatment, the final die casting had a greater yield strength than the untreated die casting.
While this invention has been described and illustrated by the examples shown, it is not intended to be strictly limited thereto, and other variations and modifications may be employed within the scope of the following claims:
What is claimed is:
1. A method for treating a metallic die casting selected from the group consisting of a casting of aluminum, magnesium and an alloy thereof, to improve the mechanical properties of said die casting which comprises placing said diecasting in a closed chamber, heating said casting at a temperature from 300 C. to 600 C. under a pressure of from to 10,000 p.s.i. for a period from 1 to 72 hours and after said treatment, rapidly cooling said casting while still under pressure, and then heating said casting of a temperature of from 100 C. to 250 C. for 1 to 72 1,891,234 12/1932 Langenberg 148-131 X hours at atmospheric pressure and subsequently cooling 3,156,974 11/1964 Bobrowsky 1484 X said casting to room temperature. 3,157,540 11/1964 Bobrowsky 148-431 2. Method according to claim 1 in Which said die cast- 3,329,535 7/1967 Langer et a1. 1484 ing is an alloy of aluminum. 5
3. Method according to claim 1 in which said die cast- OTHER REFERENCES ing is an alloy of magnesium. Alloy Digest, Filing Code Mg-36, Engr. Digest Inc.,
New Jersey, January 1958. References Cited UNITED STATES PATENTS 10 CHARLES N. LOVELL, Primary Examiner 3,496,624 2/1970 Kerr 1484 X US. Cl. X.R. 1,946,545 2/1934 Pcssel 148131 148131, 161
US00163480A 1971-07-16 1971-07-16 Heat treatments of die castings under pressure Expired - Lifetime US3732128A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866301A (en) * 1973-06-28 1975-02-18 Allegheny Ludlum Ind Inc Process for forming sheet material with excellent surface characteristics
US4021910A (en) * 1974-07-03 1977-05-10 Howmet Turbine Components Corporation Method for treating superalloy castings
US4302256A (en) * 1979-11-16 1981-11-24 Chromalloy American Corporation Method of improving mechanical properties of alloy parts
US20040103964A1 (en) * 2002-09-09 2004-06-03 Takeyoshi Nakamura Process for thermally treating light alloy casting
US20180080108A1 (en) * 2013-03-05 2018-03-22 Brunswick Corporation Method for solution heat treating with pressure
CN108239731A (en) * 2016-12-23 2018-07-03 布伦斯威克公司 The method that solution heat treatment is carried out using pressure
US11214857B2 (en) * 2018-03-15 2022-01-04 Toyota Jidosha Kabushiki Kaisha Method for manufacturing aluminum alloy member

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866301A (en) * 1973-06-28 1975-02-18 Allegheny Ludlum Ind Inc Process for forming sheet material with excellent surface characteristics
US4021910A (en) * 1974-07-03 1977-05-10 Howmet Turbine Components Corporation Method for treating superalloy castings
US4302256A (en) * 1979-11-16 1981-11-24 Chromalloy American Corporation Method of improving mechanical properties of alloy parts
US20040103964A1 (en) * 2002-09-09 2004-06-03 Takeyoshi Nakamura Process for thermally treating light alloy casting
US20180080108A1 (en) * 2013-03-05 2018-03-22 Brunswick Corporation Method for solution heat treating with pressure
US11047032B2 (en) 2013-03-05 2021-06-29 Brunswick Corporation Method for solution heat treating with pressure
CN108239731A (en) * 2016-12-23 2018-07-03 布伦斯威克公司 The method that solution heat treatment is carried out using pressure
JP2018103264A (en) * 2016-12-23 2018-07-05 ブルンスビック コーポレーションＢｒｕｎｓｗｉｃｋ Ｃｏｒｐｏｒａｔｉｏｎ Method for solution heat treating with pressure
US11214857B2 (en) * 2018-03-15 2022-01-04 Toyota Jidosha Kabushiki Kaisha Method for manufacturing aluminum alloy member
US11761070B2 (en) 2018-03-15 2023-09-19 Toyota Jidosha Kabushiki Kaisha Method for manufacturing aluminum alloy member

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