CN1004084B

CN1004084B - Cast alloy iron cylinder sleeve with high wear-resisting and good matching properties

Info

Publication number: CN1004084B
Application number: CN86107845.4A
Authority: CN
Inventors: 万长明
Original assignee: No 9 Metallurgy Construction Co Ministry Of Metallurgical Industry
Current assignee: No 9 Metallurgy Construction Co Ministry Of Metallurgical Industry
Priority date: 1986-11-19
Filing date: 1986-11-19
Publication date: 1989-05-03
Also published as: CN86107845A

Abstract

The present invention relates to an alloy cast iron cylinder sleeve with high wear resistance and good matching performance. The cast iron contains the chemical components: 3.1 to 3.8% of carbon, 2.1 to 2.6% of silicon, 0.7 to 1.3% of manganese, 0.02 to 0.08% of boron, 0.15 to 0.50% of phosphorus, less than 0.1% of sulfur, 0.3 to 1.0% of aluminium and balance of ferrum. An engine cylinder sleeve made of the cast iron is in ion heat treatment, a structure with favorable wear resistance and antifriction performance is obtained, and thus, the wear resistance and the matching performance of the product are greatly enhanced.

Description

Wear-resisting, join and pay property good steam jacket cast alloy iron

The present invention relates to a kind of engine jacket, particularly the novel steam jacket cast alloy iron that thermal treatment has the hard phase about ion.

At present, domestic and international normally used engine jacket has following a few class:

The first kind is with nitriding steel, nitrided cast iron or graphitic cast iron, oozes altogether through gas nitriding, ionitriding or ion carbon nitrogen titanium, makes the surface form the higher nitrided case of hardness, reaches wear-resisting effect.But the anti-attrition of this class steam jacket is relatively poor, its wear resistance and join and pay a property and all remain to be improved.

Second class is the cast alloy iron steam jacket that contains the hard phase, and as being skeleton mutually with hard such as phosphide or borides, these hard are comparatively wear-resisting mutually; And matrix is perlite and a little ferrite, and hardness is low, and is more easy to wear.After matrix grinds off a part, i.e. oil lubricate, thereby anti-attrition.But because matrix hardness is low easy to wear, make hard outstanding mutually, experience wear generates hard abrasive particle mutually with fractureing subsequently, has quickened wearing and tearing again.Russian patent SU-692888 discloses a kind of cast iron of similar composition, Chemical Composition is: C3.3～3.80%, Si2.10～2.60%, Mn0.30～0.80%, Cu0.10～0.60%, B0.005～0.08%, Cr0.1～0.50%, Ni0.05～0.50%, P0.05～0.20%, Ti0.001～0.30%, Al0.001～0.1%, all the other are Fe.Evidence, when the content of aluminium less than 0.1% the time, be easy to generate subsurface porosity, boron was less than 0.02% o'clock, hard is mutually less, performance is bad.

Also have the steam jacket of LASER HEAT TREATMENT and crowded carburized silicon grain in addition, its abrasion mechanism is close with hard phase alloy cast iron.

The objective of the invention is to overcome the shortcoming of the said products, obtain a kind of novel wear resistant, join the good engine jacket of paying property.

In order to achieve the above object, the present invention improves on the basis of boron-containing alloy cast iron, increase the content of the element aluminum that is beneficial to nitriding, obtain a kind of cast alloy iron of new Chemical Composition, this cast iron has the hard phase of higher hardness, again with the ion thermal processes act on the castiron cylinder sleeve of above-mentioned composition.Technological process is as follows:

Batching-founding-sand removal-roughing-thermal treatment-precision work-ion thermal treatment-cleaning packing.

The composition contrast of cylinder sleeve composition of the present invention and prior art sees Table 1.

In the cast alloy iron of cylinder sleeve of the present invention, matrix is based on perlite, and ferrite content is less than 10%, and graphite is the middle strip of A type or Type B distribution, and boron-carbide and compound iron phosphide eutectic are even mesh and distribute, and are the hard phase.Because aluminium content improves, promote nitriding, make nitride such as s phase (Fe _2-3N) with γ ' (Fe mutually ₄N) form on every side mutually as supporting at hard.Like this, make abrasion mechanism generation substantial progress because it is different with treatment process and different with the matrix composition to support the hardness of phase, matrix phase hardness (HV200～300) and hard phase hardness (＞HV900) between variation.To compare matrix mutually hard and wear-resisting owing to support, but more lower slightly than hard phase hardness, rub proofness is relatively poor, and is easy to form store oil mechanism.This store oil mechanism is longer than the store oil mechanism retention period of ordinary rigid phase alloy cast iron generation, has protected the hard phase because of the existence of supporting phase, make hard mutually not easy fracture go out abrasive particle, make the wear-resisting mechanism can prolonged preservation.Because the prolonged preservation of anti-attrition mechanism and wear-resisting mechanism, thereby increased substantially the wear resistance of steam jacket and joined paying property.

As an embodiment, adopt the main frequency furnace founding to go out the cast alloy iron of following composition: C3.32%, Si2.80%, Mn1.10%, P0.45%, B0.04%, Al0.50%, S0.028%.Sand removal after rotary casting goes out blank, roughing and thermal treatment again, precision work ionitriding (793～813 ° of K are incubated 10～20 hours), obtaining depth of penetration is 0.13～0.20mm.

Steam jacket of the present invention is compared with the product of other prior aries, its wear resistance and join and pay a property and significantly be better than the latter, and the fast mill of contrast test-results sees Table 2.

The installation test-results proves: the S195 diesel engine of using the boron cast iron cylinder sleeve at the construction field (site), the 1000 hours exhaust casing cover attrition values of working are 0.10mm, the work of this technology cylinder sleeve 3000 hours exhaust casings cover attrition value be 0.03～0.04mm, worked 6000 hours at present also in works better.

Table 1

Composition (%)

Element composition SU692888 of the present invention composition

C 3.1～3.8 3.3～3.8

Si 2.1～2.6 2.1～2.6

Mn 0.7～1.3 0.3～0.8

B 0.02～0.08 0.005～0.08

P 0.15～0.50 0.05～0.20

S ＜0.1

Al 0.3～1.0 0.001～0.1

Cu / 0.10～0.60

Cr / 0.1～0.5

Ni / 0.05～0.50

Ti / 0.001～0.30

Claims

1, a kind of wear-resisting, join and pay property good steam jacket cast alloy iron, it is characterized in that: this cast alloy iron composition is: carbon 3.1～3.8%, silicon 2.1～2.6%, manganese 0.7～1.3%, boron 0.02～0.08%, carbon 0.15～0.50%, sulphur is lower than 0.1%, aluminium 0.3～1.0%, and surplus is an iron.The thermal treatment process of this cast alloy iron steam jacket is ion nitriding thermal treatment, and its processing parameter is: 793～813 ° of K are incubated 10～20 hours.