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US 2011/0212340 A1Published application
Reduced ferrite steel liner
AssigneeCaterpillar Inc.
InventorMatthew T. Kiser
Life of this patent
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Abstract
A steel liner with a case comprising at least 95% martensite, such as substantially 100% martensite, and a core comprising pearlite and discrete ferrite grains decorating former austenite grain boundaries. The ferrite in the liner's core has an average size of less than about 25 nm.
Claims19
A steel piston liner, comprising:
- a cylindrical, hollow steel body including a case that is at least 95% martensite and a core that includes pearlite with discrete ferrite grains decorating former austenite boundaries, wherein the ferrite in the core has an average grain size of less than about 25 μm.
Dependencies are inferred from the claim text.