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A kind of multi-element micro-alloyed bainite gray cast iron, cylinder liner and preparation method thereof

A micro-alloying and bainite technology, applied in the direction of cylinder, cylinder head, mechanical equipment, etc., can solve the problems of product failure, drastic change of finished cylinder liner size, strength drop, etc., to prevent transformation, excellent high temperature microstructure and properties, The effect of hindering the growth of grains

Inactive Publication Date: 2016-03-30
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-element micro-alloyed bainite gray cast iron, which solves the problem that the strength of the existing bainite matrix is ​​reduced due to the transformation of the structure at the gas nitriding temperature, and the size of the finished cylinder liner changes drastically, which leads to product failure. question

Method used

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  • A kind of multi-element micro-alloyed bainite gray cast iron, cylinder liner and preparation method thereof
  • A kind of multi-element micro-alloyed bainite gray cast iron, cylinder liner and preparation method thereof
  • A kind of multi-element micro-alloyed bainite gray cast iron, cylinder liner and preparation method thereof

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Experimental program
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Embodiment 1

[0035] The multi-element microalloyed bainitic gray cast iron of this embodiment is composed of the following components in weight percentage: 2.70% carbon, 1.80% silicon, 0.30% manganese, 0.05% phosphorus, 0.05% sulfur, 0.3% copper, and 0.10% molybdenum , boron 0.01%, chromium 0.35%, nitrogen 0.04%, niobium 0.2%, vanadium 0.25%, titanium 0.025%; the balance is Fe.

[0036] The multi-element microalloyed bainite gray cast iron cylinder liner of this embodiment is composed of the following components in weight percentage: carbon 2.70%, silicon 1.80%, manganese 0.30%, phosphorus 0.05%, sulfur 0.05%, copper 0.3%, molybdenum 0.10%, boron 0.01%, chromium 0.35%, nitrogen 0.04%, niobium 0.2%, vanadium 0.25%, titanium 0.025%; the balance is Fe.

[0037] The preparation method of the multi-element micro-alloyed bainite gray cast iron cylinder liner of the present embodiment comprises the following steps:

[0038] 1) Prepare raw materials according to the following components by weight...

Embodiment 2

[0050] The multi-element microalloyed bainitic gray cast iron of this embodiment is composed of the following components in weight percentage: carbon 2.95%, silicon 2.15%, manganese 0.55%, phosphorus 0.05%, sulfur 0.05%, copper 0.5%, molybdenum 0.18% , boron 0.05%, chromium 0.60%, nitrogen 0.10%, niobium 0.4%, vanadium 0.35%, titanium 0.065%; the balance is Fe.

[0051] The multi-element microalloyed bainitic gray cast iron cylinder liner of this embodiment is composed of the following components in weight percentage: carbon 2.95%, silicon 2.15%, manganese 0.55%, phosphorus 0.05%, sulfur 0.05%, copper 0.5%, molybdenum 0.18%, boron 0.05%, chromium 0.60%, nitrogen 0.10%, niobium 0.4%, vanadium 0.35%, titanium 0.065%; the balance is Fe.

[0052] The preparation method of the multi-element micro-alloyed bainite gray cast iron cylinder liner of the present embodiment comprises the following steps:

[0053] 1) Prepare raw materials according to the following components by weight pe...

Embodiment 3

[0064] The multi-element microalloyed bainitic gray cast iron of this embodiment is composed of the following components in weight percentage: 2.8% carbon, 2.0% silicon, 0.4% manganese, 0.05% phosphorus, 0.05% sulfur, 0.4% copper, and 0.14% molybdenum , boron 0.03%, chromium 0.4%, nitrogen 0.07%, niobium 0.3%, vanadium 0.3%, titanium 0.045%; the balance is Fe.

[0065] The multi-element microalloyed bainite gray cast iron cylinder liner of this embodiment is composed of the following components in weight percentage: carbon 2.8%, silicon 2.0%, manganese 0.4%, phosphorus 0.05%, sulfur 0.05%, copper 0.4%, molybdenum 0.14%, boron 0.03%, chromium 0.4%, nitrogen 0.07%, niobium 0.3%, vanadium 0.3%, titanium 0.045%; the balance is Fe.

[0066] The preparation method of the multi-element micro-alloyed bainite gray cast iron cylinder liner of the present embodiment comprises the following steps:

[0067] 1) Prepare raw materials according to the following components by weight percentag...

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Abstract

The invention discloses a multi-component microalloyed bainite gray cast iron, a cylinder liner and a preparation method thereof. The bainite gray cast iron is composed of the following components by weight: 2.70%-2.95% of carbon, 1.80%-2.15% of silicon, 0.30%-0.55% Mn, larger than 0 but smaller than or equal to 0.1% of P, larger than 0 but smaller than or equal to 0.1% of S, 0.3%-0.5% of copper, 0.10%-0.18% of molybdenum, 0.01%-0.05% of boron, 0.35%-0.60% of chromium, 0.04%-0.10% of nitrogen, 0.2%-0.4% of niobium, 0.25%-0.35% of vanadium, 0.065%-0.025% of titanium, and the balance being Fe. The multi-component microalloyed bainite gray cast iron increases high-temperature structure stability of a bainite matrix, guarantees that high-temperature strength of the gray cast iron is at a relatively high level, has excellent high-temperature structure properties and low production cost, and is suitable for manufacturing high-temperature, high-speed and heavy-load engine cylinder liners.

Description

technical field [0001] The invention belongs to the technical field of bainitic gray cast iron, and specifically relates to a multivariate microalloyed bainitic gray cast iron, and also relates to a multivariate microalloyed bainitic gray cast iron cylinder liner and a preparation method thereof. Background technique [0002] As a key component of the engine, the cylinder liner is prone to wear and cavitation in the working environment of high temperature, high pressure, high load and difficult lubrication. Therefore, the cylinder liner is required not only to have high strength and hardness, but also to have good impact toughness and Heat and wear resistance. Gray cast iron is widely used in the production of cylinder liners because of its anti-friction, self-lubrication, easy processing, and low price. Among various cast iron matrix structures, bainite structure prolongs the service life of the cylinder liner with its unique mechanical properties, making bainite cast iron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10B22D1/00B22D13/00B22D27/20F02F1/00
Inventor 熊毅张凌峰刘治军姚怀游龙陈路飞秦小才
Owner HENAN UNIV OF SCI & TECH
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