# US 9,752,205 B2 · High-carbon iron-based amorphous alloy using molten pig iron and method of manufacturing the same

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- Number: US 9,752,205 B2
- Document ID: US9752205B2
- Status: Granted
- Kind: B2
- Application number: 14/943,110
- Filed: 2015-11-17
- Published: 2016-03-10
- Granted: 2017-09-05
- Earliest claimed: 2010-08-20
- Assignees: Posco; Research Institute of Industrial Science & Technology
- Applicants: Research Institute of Industrial Science & Technology; Posco
- Inventors: Sang-Won Kim; Sang-Hoon Yoon; Seong Hoon Yi; Young-Geun Son; Eon-Byeong Park; Oh Joon Kwon; Sang-Wook Ha; Seung-Dueg Choi; Gab-Sik Byun
- Web page: https://patentgrep.com/patent/US9752205B2

## CPC

- C21D 6/00: Heat treatment of ferrous alloys
- C21D 1/00: General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D 5/00: Heat treatments of cast-iron
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 1/11: Making amorphous alloys
- C22C 33/003: {making amorphous alloys}
- C22C 45/02: with iron as the major constituent
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

Provided is an iron-based amorphous alloy and a method of manufacturing the same. More particularly, provided is an high carbon iron-based amorphous alloy expressed by a general formula FeαCβSiγBxPyCrz, wherein α, β, γ, x, y and z are atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P), and chrome (Cr) respectively, wherein α is expressed by α=100−(β+γ+x+y+z) atomic %, β is expressed by 13.5 atomic %≦β≦17.8 atomic %, γ is expressed by 0.30 atomic %≦γ≦1.50 atomic %, x is expressed by 0.1 atomic %≦x≦4.0 atomic %, y is expressed by 0.8 atomic %≦y≦7.7 atomic %, and z is expressed by 0.1 atomic %≦z≦3.0 atomic %.

## Claims

### Claim 1

A method of manufacturing a high carbon iron-based amorphous alloy comprising:
preparing molten pig iron containing carbon (C) of at least 13.5 atomic %;
adding at least one of Fe—Si alloy, Fe—B alloy, Fe—P alloy and Fe—Cr alloy into the molten pig iron and melting the alloy into the molten pig iron to prepare a molten composition expressed by the following general formula: FeαCβSiγBxPyCrz, where α, β, γ, x, y and z are respective atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P) and chromium (Cr), wherein a is expressed by α=100−(β+γ+x+y+z) atomic %, β is expressed by 13.5 atomic %≦β≦17.8 atomic %, γ is expressed by 0.30 atomic %≦γ≦1.50 atomic %, x is expressed by 0.1 atomic %≦x≦4.0 atomic %, y is expressed by 0.8 atomic %≦y≦7.7 atomic % and z is expressed by 0.1 atomic %≦z≦3.0 atomic %; and
rapidly quenching the molten composition to form the iron-based amorphous alloy.

### Claim 2 (depends on 1)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 1, wherein:
the molten pig iron contains iron (Fe) of 80.4 atomic %≦Fe≦85.1 atomic %, carbon (C) of 13.5 atomic %≦C≦17.8 atomic %, silicon (Si) of 0.3 atomic %≦Si≦1.5 atomic %, phosphorus (P) of 0.2 atomic %≦P≦0.3 atomic %.

### Claim 3 (depends on 1)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 1
further comprising melting the alloy after quenching and again rapidly quenching into an amorphous alloy.

### Claim 4 (depends on 2)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 2, wherein:
the rapidly quenching is carried out by one of rapidly quenching a mold directly, a melt spinning, and an atomizing method.

### Claim 5 (depends on 1)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 1, wherein:
the high carbon iron-based amorphous alloy is any one of a ribbon shape, bulk, and powder.

### Claim 6 (depends on 2)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 2, wherein:
the high carbon iron-based amorphous alloy is any one of a ribbon shape, bulk, and powder.

### Claim 7 (depends on 3)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 3, wherein:
the high carbon iron-based amorphous alloy is any one of a ribbon shape, bulk, and powder.

### Claim 8 (depends on 4)

The method of manufacturing a high carbon iron-based amorphous alloy of claim 4, wherein:
the high carbon iron-based amorphous alloy is any one of a ribbon shape, bulk, and powder.