Moses A. Olaniran - Melvindale MI Charles A. Stickels - Ann Arbor MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
B23P 1500
US Classification:
2988809
Abstract:
A method of cracking bearing assembles including the steps of (a) forming a ductile metal (steel, aluminum or titanium) connecting rod in one piece (e. g. , by hot forging) having an annular wall defining a crankshaft opening with preformed surface crevices for guiding the initiation of a cracking plane that extends across the crank opening; (b) charging (i. e. , for about 40 seconds) the region of such wall along at least one portion of the cracking plane with hydrogen by means of an electrolytic cell or by means of reacting the metal rod with a strong acid (e. g. , concentrated sulfuric) to cause hydrogen to dissolve in the metal to facilitate hydrogen stress cracking thereat, with or without the imposition of static mechanical tensile loading at such crevices (i. e. , for about 40 seconds) of a magnitude insufficient to cause yielding of the metal; and (c) prolonging, increasing, or imposing the static mechanical loading (i. e. , for another 40 seconds) at the crevices to effect fracture across the entire cracking plane and thereby separate the connecting rod into a cap and body with rough, fractured mating surfaces.
Heat Treatment For Ball Bearing Steel To Improve Resistance To Rolling Contact Fatigue
Charles A. Stickels - Ann Arbor MI Anthony T. Anderson - Romulus MI Adam M. Janotik - Grosse Ile MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
C21D 940
US Classification:
148 124
Abstract:
A method (and resulting product) for preparing bearing components is disclosed. Utilizing a low alloy steel shape containing carbon in the range of 0. 6-1. 5% and containing alloying ingredients in the range of 1-2% selected from the group consisting of Cr, Mn, Ni, Cu and Mo (and preferably the ingredients of SAE 52100 steel), the steel shape is subjected sequentially to a spheroidizing-anneal heat treatment, a rough forming treatment, and a hardening-heat treatment. Immediately prior to the hardening-heat treatment, a fine bainitic or preferably pearlitic microstructure is established having relatively thin carbide films at prior austenite grain boundaries. Austenitizing of said pearlitic or bainitic microstructure is carried out at a temperature in the range of 1625. degree. -1675. degree. F for a period of time preferably between 15 seconds and one-half hour, but operationally for a period of time as short as 5 seconds and as long as 1 hour.
Machinable, Strong, But Crackable Low Ductility Steel Forging
Moses A. Olaniran - Dearborn MI Charles A. Stickels - Ann Arbor MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
C22C 3804
US Classification:
148320
Abstract:
A crackable forging steel with excellent machinability and low ductility consisting of (by weight percent): 0. 6-0. 75 carbon, 0. 25-0. 5 manganese, 0. 04-0. 12 sulfur, and the remainder essentially iron except for up to about 1. 2% residual impurities selected from the group consisting of phosphorous, silicon, nickel, vanadium, copper, chromium, and molybdenum, the manganese/sulfur ratio being greater than 3. 0 and the microstructure of said alloy being substantially 100% pearlite with a grain size grade between 3-8 according to ASTM Specification E112-88. A method of making a connecting rod with such steel comprising: (a) forging a rod of such steel; (b) cooling the forging to ensure essentially a 100% pearlitic microstructure and a grain size of 3-8 ASTM per Specification E112-88; (c) fracturing the rod into cap and body portions; (d) reassembling by use of bolts which have a clearance no greater than 0. 04 inch to guide the fractured surfaces to within 0. 002 inch of their original integration and thereafter, while the cap and body portions are free to laterally adjust, applying a clamping load through the bolts to force the fractured ridges into exact rematch.
Formable, Temperature-Resistant Martensitic Steel Having Enhanced Resistance To Wear
Charles A. Stickels - Ann Arbor MI Claude M. Mack - Ypsilanti MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
E22C 3812
US Classification:
420111
Abstract:
An alloy steel composition is disclosed which has characteristics of (a) enhanced resistance to hardness degradation under high temperatures and/or enhanced resistance to sliding wear and contact fatigue under conditions of poor lubrication, (b) ease of softening for formability and machinability, and (c) ease of heat treating for hardening with austenitizing (or carburizing) at a temperature of 950. degree. -960. degree. C. and tempering at a temperature at or below 600. degree. C. The composition comprises essentially, by weight, carbon--0. 15-0. 30%, Mo--2. 0-3. 5%, V--0-0. 45%, Cr--0-0. 75%, Mn--0. 25-0. 50%, Si--0. 15-0. 35%, and remainder Fe.
Method Of Making High Strength Ferritic Ductile Iron Parts
Bela V. Kovacs - Bloomfield Hills MI Roman M. Nowicki - Bloomfield Hills MI Charles A. Stickels - Ann Arbor MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
C21D 514 C22C 3704 C22C 3710
US Classification:
148 3
Abstract:
A method of strengthening ferritic ductile iron castings while maintaining ductility at a high level is disclosed. An iron alloy melt is cast consisting essentially of by weight 3. 9-6. 0% Si, 3. 0-3. 5% C, 0. 1-0. 3% Mn, 0-0. 35% Mo, at least 1. 25% Ni, no greater than 0. 015% S and 0. 6% P, the remainder Fe, the melt having been subjected to a nodularizing agent to form graphite nodules upon solidification. The cast alloy is heat treated to provide a fully ferritic microstructure with 9-14% by volume graphite, a yield strength of at least 75,000 psi, a tensile strength of at least 95,000 psi, and an elongation of at least 17%.
Coating Method Of Gas Carburizing Highly Alloyed Steels
Charles Arthur Stickels - Ann Arbor MI Claude Melvin Mack - Ypsilanti MI Gary Wayne Hagler - Howell MI Eugene Joseph Cabadas - Fenton MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
C23C 822
US Classification:
148220
Abstract:
A method of applying a surface coating to promote gas carburization of a highly alloyed steel. The method includes the step of coating the highly alloyed steel with a layer of iron or an iron alloy to form a coated steel before carburizing the coated steel in a conventional gas carburizing atmosphere.
Method Of Heat Treating High Carbon Alloy Steel Parts To Develop Surface Compressive Residual Stresses
Charles A. Stickels - Ann Arbor MI Adam M. Janotik - Grosse Ile MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
C21D 148
US Classification:
148 165
Abstract:
A method of developing compressive residual stresses in the surface region of a high carbon steel alloy article is disclosed. The article is made of an alloy having 0. 8-1. 6% C, 0. 2-5% Cr, 0-20% ingredients selected from the group consisting of M. sub. N, V, Mo, W, Si, and the remainder Fe. The article is heated in a carburizing atmosphere at 800. degree. -950. degree. C. for 1-2. 5 hours, and then quenched to cool the central core of the article at a rate sufficiently fast to suppress the formation of non-martensitic austenite decomposition products, thereby establishing a residual compressive stress gradient proceeding from the surface to a depth of 0. 007-0. 03 inches.
Method Of Making Ductile Cast Iron With Improved Strength
Bela V. Kovacs - Bloomfield Hills MI Roman M. Nowicki - Bloomfield Hills MI Charles A. Stickels - Ann Arbor MI
Assignee:
Ford Motor Company - Dearborn MI
International Classification:
C21D 500 C22C 3710
US Classification:
148 3
Abstract:
A method of making ductile cast iron with a matrix of acicular ferrite and bainite is disclosed. A melt by weight of 3. 0-3. 6% carbon, 3. 5-5. 0% silicon, 0. 7-5. 0% nickel, 0-0. 3% Mo, >0. 015% S, >0. 06% P (remainder Fe) is subjected to a nodularizing agent and solidified. The iron is then heat treated by heating to 1575. degree. -1650. degree. F. for 1-3 hours, quenched to 400. degree. -775. degree. F. at a rate of at least 275. degree. F. /min. , held for 0. 5-4 hours, and cooled to room temperature. The resulting ductile iron exhibits a yield strength of at least 80 ksi, a tensile strength of at least 140 ksi, elongation of at least 6%, and a hardness of at least 270 BHN.
1st International Automotive Heat Treating Conference Proceedings: Proceedings of the 1st Interntional Automotive Heat Treating Conference, 13-15 July 1998, Puerto Vallarta, Mexico