Double-metal exhaust gate for diesel engine of diesel locomotive and its manufacture

Abstract

The double-metal exhaust gate for diesel engine of diesel locomotive is manufactured with super Fe-Ni alloy comprising C 0.04-0.15 wt%, Si 0.40-1.20 wt%, Mn 0.50-1.0 wt%, Cr 20.0-24.0, Ni 30.0-40.0 wt%, Ti 2.5-3.0 wt%, Al 0.60-1.20 wt%, Nb 0.40-1.20 wt%, V 0.01-0.20 wt%, W 0.60-0.80 wt%, B 0.01-0.04 wt%, Mg 0.01-0.04 wt%, Ce 0.005-0.08 wt%, Co 0.5-1.0 wt%, Mo 0.15-0.30 wt% and Cu 0.05-0.30 wt% other than Fe. The gate material has good performance and machinability, stable quality and high performance / cost ratio.

Description

technical field [0001] The invention relates to an exhaust valve, in particular to a diesel bimetallic exhaust valve for a diesel locomotive and a manufacturing method thereof. Background technique [0002] The exhaust valve of the diesel locomotive diesel engine valve train is an important moving part of the engine. Its service conditions are harsh and the working environment is harsh. Therefore, the valve is required to have excellent comprehensive performance, not only high temperature strength and thermal stability, but also Excellent resistance to high temperature gas corrosion, oxidation resistance and wear resistance. The comprehensive manifestation of the above performances basically depends on the structure, material properties and manufacturing method of the valve. The performance of the valve directly affects the power performance, service life and reliability of the main engine. The destructive failure of the valve during locomotive operation will lead to engin...

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Problems solved by technology

[0003] 1. The conical surface of the valve disc is strengthened by cladding the high-temperature hard surface wear-resistant alloy (shown in Figure 1), which is not only complicated in process and difficult to manufacture, but also affects the overall structural performance of the valve. A large number of valves are running for 15 Over 10,000 kilometers of overlay welding area cracks and blocks are also one of the main causes of diesel engine valve accidents, which seriously affect the service life of the valve

[0004] 2. The performance of the valve material 4Cr4Ni14W2Mo cannot meet the working requirements of the diesel engine exhaust valve of diesel locomotives, and the service life cannot meet the requirements of the reliability management of the Ministry of Railways' maintenance department for the valve: that is, no maintenance requirements, the valve runs ≥ 300,000 kilometers, and the service life of the valve It is required to reach the target value of 800,000 kilometers ± 100,000 kilometers for locomotive overhaul

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