CN86107204A - The high-frequency isothermic quenching of spheroidal graphite cast iron - Google Patents
The high-frequency isothermic quenching of spheroidal graphite cast iron Download PDFInfo
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- CN86107204A CN86107204A CN 86107204 CN86107204A CN86107204A CN 86107204 A CN86107204 A CN 86107204A CN 86107204 CN86107204 CN 86107204 CN 86107204 A CN86107204 A CN 86107204A CN 86107204 A CN86107204 A CN 86107204A
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- cast iron
- spheroidal graphite
- graphite cast
- ferrite
- bainite
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Abstract
The invention provides a kind of heat treating method and corresponding ductile cast iron material of new spheroidal graphite cast iron.Be characterized in: the method acquisition upper layer with ratio-frequency heating, isothermal quenching is a bainite structure, and rest part is the spheroidal graphite cast iron of ferrite matrix or ferrite-pearlite mixed matrix.Because surface structure is bainite, thus surface toughness than martensite height, the crackle tendency is less.Method is the surface heating, has saved energy consumption, has shortened the production cycle.Because do not harden in inside, easily process the characteristics that noise abatement is good so have heart portion again than common isothermal quenching.Therefore this material is subjected to the workpiece of contact load for surface only, considers all to be suitable for from performance and economic aspect.
Description
The present invention relates to a kind of surface heat treatment process of spheroidal graphite cast iron, particularly pass through after the ratio-frequency heating again in isothermobath the surface heat treatment process of Cooling Quenching rapidly.
The high-frequency quenching of existing spheroidal graphite cast iron mainly is to obtain the surface to be the hardened layer of martensitic stucture, as the patent application J53-106322 of Japanese ャ ソ マ-デ イ-ゼ Le Co., Ltd. proposition.Its technological process is: the spheroidal graphite cast iron of ferrite, pearlite mixed matrix is heated to other part surface about 900 ℃ through high frequency, and chilling is quenched into room temperature then.Obtain martensitic cementation zone, rest part still is ferrite and pearlitic mixed matrix.The surface of part in addition like this has high hardness and wear resistance.And because amount of ferrite is present in other part inside, part inside has very high plasticity and anti-bending strength in addition.
The problem that this method exists is: austenite is in the martensitic transformation process, and martensitic specific volume is bigger than austenite, and is more much bigger than original structure, will cause volumetric expansion significantly, causes the increase of internal stress, and is especially true in the high-carbon regions around the graphite.This not only causes toughness to descend at workpiece surface, and around martensite or the austenite matrix place cause great crackle tendency.
The object of the present invention is to provide a kind of new heat treating method of spheroidal graphite cast iron, with obtain a kind of when having high-ductility high wear-resistant, also have the power consumption low, the ductile cast iron material of price economy.
Method provided by the present invention is: other part of spheroidal graphite cast iron is heated to rapidly more than 900～6000 ℃ through high frequency, zone of heating is realized after the complete austenitizing, immerse 250～400 ℃ salt made from earth containing a comparatively high percentage of sodium chloride medium fast, under this temperature, be incubated 30～60 minutes.Be bainite thereby obtain other part surface, rest part is the material of ferrite or ferrite-pearlite.
The ductile cast iron material that obtains with method provided by the present invention compares with the technology that Japanese J53-106322 patent is provided, and eliminated the tendency that the Malpighian layer that high-frequency quenching obtained easily produces internal stress.Thereby can improve the toughness of cast(ing) surface and the formation of minimizing crackle.This method is compared with common austempering, has lower energy expenditure and less part thermal change type in addition.This is higher for those surface requirements toughness, and the less demanding part in addition of rest part is both economical.On the other hand, the surface high frequency of spheroidal graphite cast iron is quenched than the induction-hardened surface hardness low (from being reduced to about HRC40 more than the HRC50) of steel, thereby processing characteristics is better, and noise abatement is preferably arranged.
As an application example of the present invention, be that ferritic ductile iron gear is heated to 900～920 ℃ with high frequency heating machine rapidly with its upper layer with matrix, in 280 ℃ the isothermal salt made from earth containing a comparatively high percentage of sodium chloride medium quenched rapidly then, kept therein 30～60 minutes.The surface of part will obtain the complete bainite layer of 1～4 mm thick like this, in addition.What close on the bainite layer is the incomplete bainite layer of 3～4 mm thick, and rest part is a ferrite.
Claims (3)
1, a kind of spheroidal graphite cast iron surface heat-treatment process, its spheroidal graphite cast iron part in addition are heated to 900～1000 ℃ rapidly with high frequency.After the invention is characterized in that layer to be heated is realized complete austenitizing, other part put into fast in 250～400 ℃ the isothermal salt bath, under this temperature, be incubated 30～60 minutes.
2, according to claim, described spheroidal graphite cast iron is part in addition, and its surface is a bainite structure, and rest part is the tissue of ferrite matrix or ferrite-pearlite mixed matrix.
3, according to claim 1 and 2 described spheroidal graphite cast iron part in addition, its surface is the bainite layer of 1～4 mm thick, and closing on the bainite layer is the incomplete bainite layer of 3～4 mm thick, and rest part is the mixed structure of ferrite or ferrite-pearlite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107204 CN86107204A (en) | 1986-10-15 | 1986-10-15 | The high-frequency isothermic quenching of spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107204 CN86107204A (en) | 1986-10-15 | 1986-10-15 | The high-frequency isothermic quenching of spheroidal graphite cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86107204A true CN86107204A (en) | 1988-05-04 |
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ID=4803511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86107204 Pending CN86107204A (en) | 1986-10-15 | 1986-10-15 | The high-frequency isothermic quenching of spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86107204A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348740C (en) * | 2004-12-02 | 2007-11-14 | 张志祥 | Nodular cast iron crank shaft waste heat isothermal hardening |
| CN100398672C (en) * | 2002-09-04 | 2008-07-02 | 英特米特公司 | Austempered cast iron article and a method of making the same |
| CN102943154A (en) * | 2012-10-10 | 2013-02-27 | 石家庄理想汽车零部件有限公司 | Processing method of surface hardening cast iron sleeve |
| CN104480283A (en) * | 2014-11-17 | 2015-04-01 | 芜湖金龙模具锻造有限责任公司 | Machine tool spindle heat treatment method |
-
1986
- 1986-10-15 CN CN 86107204 patent/CN86107204A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100398672C (en) * | 2002-09-04 | 2008-07-02 | 英特米特公司 | Austempered cast iron article and a method of making the same |
| CN100348740C (en) * | 2004-12-02 | 2007-11-14 | 张志祥 | Nodular cast iron crank shaft waste heat isothermal hardening |
| CN102943154A (en) * | 2012-10-10 | 2013-02-27 | 石家庄理想汽车零部件有限公司 | Processing method of surface hardening cast iron sleeve |
| CN104480283A (en) * | 2014-11-17 | 2015-04-01 | 芜湖金龙模具锻造有限责任公司 | Machine tool spindle heat treatment method |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |