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US 9,850,846 B1Granted
Cylinder liner and method of forming the same
AssigneeZynp International Corp.
InventorXiaocai Qin
Life of this patent
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Abstract
A high strength cast iron material for application in heavy duty diesel engines with Pa peak cylinder pressure greater than 240 bar is disclosed, the material a ductile material austempered to get a ausferrite matrix structure with higher mechanical properties than conventional cast iron materials available by using a designed low cost alloying cast material with heat treatment. Furthermore, the cylinder liner may be formed using novel heat treatment and/or fine honing processes to improve the properties thereof.
Claims14
A cylinder liner comprising:
- an inner sidewall formed from a microstructure comprising ausferrite, nodular graphite, between about 3.55 wt % and about 3.65 wt % C, and between about 0.005% and about 0.06% Mg, wherein the microstructure includes graphite-nodular (form I) >80%, nodule size class 6-7 (20-30 μm), and matrix-acicular ausferrite.
A cylinder liner comprising:
- a sidewall formed from a microstructure comprising ausferrite and nodular graphite, wherein the microstructure includes graphite-nodular (form I) >80%, nodule size class 6-7 (20-30 μm), and matrix-acicular ausferrite, the sidewall consisting essentially of:
- between about 3.55 wt % and about 3.65 wt % C,
- between about 2.30 wt % and about 2.40 wt % Si,
- between about 0.45 wt % and about 0.50 wt % Mn,
- between about 0.020 wt % and about 0.030 wt % P,
- between about 0.15 wt % and about 0.25 wt % S,
- between about 0.80 wt % and about 0.90 wt % Cu,
- between about 0.30 wt % and about 0.40 wt % Ni,
- between about 0.10 wt % and about 0.20 wt % Mo, and
- between about 0.005% and about 0.06% Mg.
7 more elements
Dependencies are inferred from the claim text.