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Corrosion and wear resistant alloy

An alloy and iron-based alloy technology, applied in the field of high-temperature corrosion-resistant and wear-resistant iron-based alloys, can solve the problems of reduced matrix strength and hardness, accelerated wear deformation, and high price of cobalt-based alloys

Active Publication Date: 2008-04-16
L E JONES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a major disadvantage of cobalt-based alloys is the relatively high price
On the other hand, iron-based VSI materials typically lose matrix strength and hardness with increasing temperature, which can lead to accelerated wear and / or deformation

Method used

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Embodiment

[0050] Alloys having the compositions shown in Table I were cast according to standard casting techniques. The alloy was cast into 50 lbs. per batch (heat). Experimental Heat A was cast at 2882°F. In the hardened and tempered condition, the microstructure of Heat A included martensite and pearlite. Heat A was cast at 1600 Hardened for about 3 hours at °F, quenched in flowing air and tempered for about 3.5 hours at 1200°F. To improve the oxidation resistance of Heat A, a pilot heat was prepared with lower C and Mo content B (cast at 2850°F). Heat B also contained B and Nb to increase hardness after hardening and tempering. To obtain an alloy with better toughness than Heat B, a third alloy was prepared, the present Inventive Heat C (cast at 2850°F). Heat C exhibits improved hardness and improved toughness. Heat C is characterized as a low B, high Cr, high Mo Fe-based alloy. Heat C has excellent castability and can be heat treated at temperatures up to 1850°F in an oxygen-cont...

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Abstract

An iron-based corrosion resistant and wear resistant alloy. The alloy can comprise (in weight percent) 0.005-0.5% boron, 1.2-1.8% carbon, 0.7-1.5% vanadium, 7-11% chromium, 1-3.5% niobium, 6-11% molybdenum, and the balance including iron and incidental impurities. Alternatively, the Nb content can be replaced or combined with Ti, Zr, Hf and / or Ta such that 1%<(Ti+Zr+Nb+Hf+Ta)<=3.5. The alloy has improved hot hardness and high temperature compressive strength and is suitable for use in elevated temperature applications such as in diesel valve seat inserts.

Description

field of invention [0001] The invention relates to a high-temperature corrosion-resistant and wear-resistant iron-based alloy; in particular, it relates to an alloy used as a valve seat insert. Background of the invention [0002] Tighter diesel engine exhaust emissions laws have led to changes in engine design, including the need for high-voltage electronic fuel injection systems. Engines built to the new design use higher combustion pressures, higher operating temperatures, and less lubrication than previous designs. The newly designed components include the valve seat insert (VSI), which has a fairly high wear rate. Exhaust valve seat inserts and valves, for example, must be able to withstand multiple valve impact events and combustion events with minimal wear, such as frictional, adhesive, and corrosive wear. This has driven material selection towards more wear resistant materials compared to seat insert materials typically used in the diesel engine industry. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C22C38/22C22C38/24C22C38/26C23C
CPCC22C38/54C21D1/18B22F2998/00F01L2101/00F01L2103/00C22C38/04C22C33/0278C22C38/44C21D2211/003C21D9/40C22C38/46C21D2211/008C22C38/48C21D6/002C22C38/02C21D9/0068F01L3/04F01L3/02F01L2820/01F01L2301/00F01L2303/00B22F3/10
Inventor 乔从跃T·特鲁迪奥
Owner L E JONES CO
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