Metal alloys for high impact applications

Patent metadata

Field	Value
Publication number	US-9976204-B2
Application number	US-201514728297-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Feb 1, 2010
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A casting of a white cast iron alloy and a method of producing the casting are disclosed. A white cast alloy is also disclosed. The casting has a solution treated microstructure that comprises a ferrous matrix of retained austenite and chromium carbides dispersed in the matrix, with the carbides comprising 15 to 60% volume fraction of the alloy. The matrix composition comprises: manganese: 8 to 20 wt %; carbon: 0.8 to 1.5 wt %; chromium: 5 to 15 wt %; and iron: balance (including incidental impurities).

First claim

The invention claimed is:

1. A white cast iron alloy comprising the following bulk chemistry:
chromium: 7 to 36 wt %;
carbon: 3 to 8.5 wt %;
manganese: 5 to 18 wt %;
silicon: 0 to 1.5 wt %;
titanium: greater than 5 wt % to 13 wt %; and
balance of iron and incidental impurities.

2. A white cast iron alloy comprising the following bulk chemistry:
chromium: 7 to 36 wt %;
carbon: 3 to 8.5 wt %;
manganese: 5 to 18 wt %;
silicon: 0 to 1.5 wt %;
niobium: greater than 10 wt % to 33 wt %; and
balance of iron and incidental impurities.

3. A white cast iron alloy comprising the following bulk chemistry:
chromium: 7 to 36 wt %;
carbon: 3 to 8.5 wt %;
manganese: 5 to 18 wt %;
silicon: 0 to 1.5 wt %;
niobium and titanium: greater than 10 wt % to 25 wt %; and
balance of iron and incidental impurities.

Assignees

• Weir Minerals Australia Ltd

Inventors

• Dolman Kevin

Classifications

• C22C37/06 Primary

  containing chromium · CPC title

• C22C33/08

  Making cast-iron alloys · CPC title

• C22C37/10

  containing aluminium or silicon · CPC title

• C21D6/002

  containing Cr (C21D6/004 takes precedence) · CPC title

• C21D6/008

  containing Si · CPC title