US1543921A - Metallic alloy - Google Patents

Description

Patented June 30, 1925.

UNITED BERT MACE HUFF, 0F DETROIT, MICHIGAN, ASSIGNOE 0F ONE-THIRD TO IHAROLD A. ARNOLD, 0E DETROIT, MICHIGAN, AND ONE-THIRD T0 MAURICE E. FITZGERALD,

0F PONTIAC, MICHIGAN.

METALLIC ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, Bnn'r MACE HUFF, a citizen of the United States of America, residing atDetroit, in the county of Wayne and State of Michigan, have invented cer tain new and useful Improvements in Metallic Alloys, of which the following is a specification.

The invention relates to metallic alloys and more particularly to a non-ferrous type suitable for the manufacture of cutting tools. The object of the invention is to produce an alloy having great hardness and toughness, one that will not be susceptible to ready oxidation and that may be welded and will have other desirable properties for use as a cutting tool.

The principal ingredients of my new alloy are cobalt, chromium and tungsten and, while these elements have heretofore been used in the manufacture of non-ferrous cutting alloys, I have found that by properly proportioning the percentages of these ele-- ments and adding thereto certain amounts of other elements it is possible to obtain a cutting alloy having qualities superior to any of the commercial alloys of this general nature. Amongst the elements which may be added to cobalt, chromium and tungsten to produce a better alloy are manganese and silicon and these are preferably present to the amount of about one percent each.

As a typical example of my improved alloy the following complete analysis is submitted:'

Per cent.

Cobalt 45. 72

Uh i gage by these percentages except as denoted in T t 12 2 the appended claims Iron 4.14:

C b 2 37 Minimum Maximum I l C halt Perze'nt Per cent moreIIIIIIIIIZIIIIIIIIIIIIIIIIII e197 ggggliiiiii:33333333333333: 3

Calcium 0. 34 g E100 Magnesium 08 M =infiI"""IIIIIIIIIIIIIIIIIIIIIIII 11% 1.23

Phosphorus 0.04 8mm L00 t l 99.45 The carbon in the alloy may be introabove analysis, it is preferableto use rela- Application filed January 28, 1924. Serial N0.G89,M9.

tively pure materials, the chromium and tungsten being ninety-five percent (95%) pure and the cobalt ninety percent (90%) pure. It is also preferable to introduce the manganese and silicon by adding to the above metals the proper proportions of man ganese and silicon, each approximately ninety percent (90%) pure. It is also desirable to introduce a small amount of iron into the mixture, preferably in the form of malleable or Norway iron. The materials are mixed in the desired proportions and melted, preferably in an electric arc furnace under a temperature of approximately 2800 degrees Fahrenheit, and when thoroughly molten the alloy is cast into chills. The resulting product is found to be exceedingly hard, tough, non-magnetic, and weldable, 'and cannot be machined by ordinary methods.

While the above analysis has been given to show a typical alloy embodying my invention, I wish it understood that I do not restrict myself to the exact percentages mentioned therein for it is obvious that some limits of my preferred composition, al-

though I wish it understood that I do not regard myself as being necessarily limited duced combined with the other materials, such, for instance, as the malleable iron and it is sometimes also introduced by absorption from the crucible or the carbon electrodes of the arc furnace.

What I claim as my invention is 1. A metallic alloy containing as the principal ingredient substantial amounts of cobalt, chromium and tungsten totaling not less than 70% together with relatively small amounts of manganese and silicon, the cobalt not exceeding 50%, the chromium not exceeding and the tungsten not exceeding 15%.

2. A metallic alloy containing cobalt from to chromium from 25% to 35%, tungsten from 5% to 15% together with small amounts of manganese and silicon.

3. A metallic alloy containing cobalt from 40% to 50%, chromium from 25% to 35%, tungsten from 5% to 15%, carbon from 1% to 4%, manganese from 1% to 1 and silicon from 1% to 5%.

4. A metallic alloy containing cobalt, approximately forty-six percent (46%), chromium, approximately thirty-one percent (31%), tungsten, approximately thirteen percent (13%), together with small amounts of iron, manganese and silicon.

5. A metallic alloy containing cobalt, approximately forty-six percent (46%), chromium approximately thirty-one percent (31%), tungsten, approximately thirteen percent (13%), together with small amounts of iron, manganese, silicon and carbon.

6; A metallic alloy containing cobalt, approximately forty-six percent (46%), chromium, approximately thirty-one percent (31%), tungsten, approximately thirteen percent (18%), iron, approximately four percent (4%), carbon, approximately two and five-tenths percent (2.5%), manganese, approximately one percent (1%), 52nd )silicon, approximately one percent 7. A metallic alloy consisting of the ingredients in the proportions substantially In testimony whereof I affix my signature.

BERT MACE HUFF.