CN106555038A - Improve the spheroidizing method of high alloy magnesium iron mechanical performance - Google Patents
Improve the spheroidizing method of high alloy magnesium iron mechanical performance Download PDFInfo
- Publication number
- CN106555038A CN106555038A CN201510646513.4A CN201510646513A CN106555038A CN 106555038 A CN106555038 A CN 106555038A CN 201510646513 A CN201510646513 A CN 201510646513A CN 106555038 A CN106555038 A CN 106555038A
- Authority
- CN
- China
- Prior art keywords
- high alloy
- magnesium iron
- stove
- mechanical performance
- improve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The present invention relates to a kind of nodularization degeneration method for improving high alloy magnesium iron mechanical performance.A kind of containing high alloy ductile iron foundry goods such as SiMoCr, after normative heat treatment such as high-temperature carbonization annealing, after its stretching, elongation percentage is low, poor toughness, and case hardness height has minute crack, poor processability.Jing repetition tests, for the different qualities brought containing high alloy, redeterminate phase transition temperature, have selected one kind after soak, and furnace temperature is heated to 840 DEG C to 800 DEG C, and after continuous quadratic, stove is cooled to 750 DEG C again, air cooling of then coming out of the stove.So after heat treatment, the elongation percentage of high alloy magnesium iron increases by 50% or so, and case hardness reduces HB15 or so, greatly improves processing characteristics.
Description
Technical field
High alloy iron casting carries out the high temperature spheroidizing Technology for Heating Processing of mechanical performance improvement
Background technology
Engine for automobile turbocharger is a kind of device of energy-saving and emission-reduction, but with engine exhaust temperature
The raising of degree, booster turbine material also require that raising heat resistance.Such as Honeywell Inc.
846048-0001 volutes its materials is the magnesium iron containing high SiMoCr, because alloy content it is high, the surface of foundry goods
Hardness is high, and poor toughness, the drop-down elongation after fracture of room temperature are just low.According to the heat recommended in the said firm's standard
Processing method is tested, and foundry goods metallography microscope observation pearlite adds carbide content to be down to by 24%
15.1%, although rate of cooling is slow, but the roughening of eutectoid carbide lamella, the pearlite lamella knot after transformation
Structure is obvious, and also less, pearlite is obvious with the interface of ferrum table body for pearlite change of shape, brilliant
Between alloy carbide still wrapped up in by pearly-lustre body colour, border wedge angle do not occur yet passivation.This material stress is easy
Stress concentration is produced, micro-crack is produced, it is exactly principal mode that fragile material ruptures such as extend go out.Institute
Not up to standard always with the elongation percentage of the mechanical property of materials, case hardness can drop yet, to subsequent mechanical plus
Work brings very big impact.
The content of the invention
The purpose of the present invention is to improve the spheroidizing method of high alloy magnesium iron mechanical performance.For height
SiMoCr magnesium irons, as Mo and Cr are the formation elements of carbide, form intergranular alloy in material
Carbide, lamellar pearlite content are higher, and carbide in the form of sheets, is it requires by annealing process,
Lamellar pearlite nodularization, intergranular carbide angle purification is made to be remarkably improved material toughness.Conventional heat
Treatment temperature and time are to be unable to reach improved purpose, due to the balance of the addition to material of alloying element
State austenitizing temperature and eutectoid temperature have a certain impact, it is necessary to actual transformation temperature is redeterminated to material
Degree, by survey obtain high alloy magnesium iron phase transition temperature in 900 to 730 DEG C of cooling procedure, must
The annealing process for being adapted to high alloy magnesium iron must be redesigned.
The technical scheme is that, original annealing process be 940 ± 5 DEG C insulation 6 hours after again with
Stove is cooled to 750 DEG C, needs 3 hours, then air cooling of coming out of the stove.Through repetition test, select in the cold mistake of stove
Cheng Zhong, is again heated to 840 DEG C when material cools to 800 DEG C with the furnace, so double cold with stove again
To 750 DEG C of air coolings of coming out of the stove.
The remarkable result of the present invention be after insulation by increase heating twice from 800 DEG C to 840 DEG C and
Stove is cold, and carbide is completely converted into a granular pearlite, and pearlite is disappeared with ferrite interface, ferrite
Join together, intergranular carbide surface wedge angle radius of curvature becomes big, and passivation occurs.Its advantage is to be difficult to make
Into stress concentration, be conducive to improving toughness, the hardness that elongation percentage has more than 50% growth, material has HB15
Reduction amplitude, effectively improve processing characteristics.
Description of the drawings
The high SiMoCr magnesium irons spheroidizing curves of Fig. 1.
Specific embodiment
Improve the spheroidizing curve of high alloy magnesium iron mechanical performance.When high-alloy casting is heated in heat treatment
When 940 DEG C are heated in stove, 6 hours are incubated in stove, start furnace cooling, when being cooled to 800 DEG C
When be heated to 840 DEG C, such continuous quadratic, then furnace cooling to 750 DEG C takes out cold in atmosphere
But arrive room temperature.
Claims (1)
1. it is a kind of improve high alloy magnesium iron mechanical performance spheroidizing method, it is characterised in that：
After the insulation 6 hours of 940 DEG C of high temperature, furnace cooling heats up again high alloy iron casting to 800 DEG C
To 840 DEG C, then furnace cooling is to 800 DEG C, then is warmed up to 840 DEG C, then furnace cooling is to 750 DEG C,
Thereafter to come out of the stove room temperature is cooled in air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510646513.4A CN106555038A (en) | 2015-09-28 | 2015-09-28 | Improve the spheroidizing method of high alloy magnesium iron mechanical performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510646513.4A CN106555038A (en) | 2015-09-28 | 2015-09-28 | Improve the spheroidizing method of high alloy magnesium iron mechanical performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106555038A true CN106555038A (en) | 2017-04-05 |
Family
ID=58417916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510646513.4A Pending CN106555038A (en) | 2015-09-28 | 2015-09-28 | Improve the spheroidizing method of high alloy magnesium iron mechanical performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106555038A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157868A (en) * | 2019-06-28 | 2019-08-23 | 含山县兴达球墨铸铁厂 | A kind of heat treatment process of spheroidal graphite cast-iron Piston Casting |
| CN110295273A (en) * | 2018-03-22 | 2019-10-01 | 科华控股股份有限公司 | A kind of annealing process method improving vehicle turbine shell high silicon molybdenum chromium magnesium iron mechanical performance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011256456A (en) * | 2010-06-11 | 2011-12-22 | Sanyo Special Steel Co Ltd | Method for manufacturing steel for cold forging |
| CN102399954A (en) * | 2011-11-28 | 2012-04-04 | 燕山大学 | Variable-temperature treatment fast nodulizing method for high-carbon pearlite steel |
| CN104232859A (en) * | 2014-09-19 | 2014-12-24 | 北京科技大学 | Heat treatment method for GCr15SiMn steel |
| JP2015094005A (en) * | 2013-11-12 | 2015-05-18 | 株式会社神戸製鋼所 | Spheroidizing heat treatment method for alloy steel |
-
2015
- 2015-09-28 CN CN201510646513.4A patent/CN106555038A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011256456A (en) * | 2010-06-11 | 2011-12-22 | Sanyo Special Steel Co Ltd | Method for manufacturing steel for cold forging |
| CN102399954A (en) * | 2011-11-28 | 2012-04-04 | 燕山大学 | Variable-temperature treatment fast nodulizing method for high-carbon pearlite steel |
| JP2015094005A (en) * | 2013-11-12 | 2015-05-18 | 株式会社神戸製鋼所 | Spheroidizing heat treatment method for alloy steel |
| CN104232859A (en) * | 2014-09-19 | 2014-12-24 | 北京科技大学 | Heat treatment method for GCr15SiMn steel |
Non-Patent Citations (2)
| Title |
|---|
| 徐修炎 等: "《钢铁件热加工技术及质量控制》", 31 December 1986 * |
| 王邦杰: "《实用模具材料与热处理速查手册》", 31 January 2014 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295273A (en) * | 2018-03-22 | 2019-10-01 | 科华控股股份有限公司 | A kind of annealing process method improving vehicle turbine shell high silicon molybdenum chromium magnesium iron mechanical performance |
| CN110157868A (en) * | 2019-06-28 | 2019-08-23 | 含山县兴达球墨铸铁厂 | A kind of heat treatment process of spheroidal graphite cast-iron Piston Casting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107937831B (en) | Pressure vessel 12Cr2Mo1V steel alloy and its forging heat treatment process | |
| CN103266212B (en) | Thermal treatment technology for improving low-temperature impact toughness of 25Cr2Ni4MoV steel forging | |
| CN103352170B (en) | Alloy wrought steel and production method thereof and application | |
| CN101476088B (en) | R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof | |
| CN103436803A (en) | Processing method for pump head body of five-cylinder plunger pump | |
| CN107746915B (en) | A kind of brake disc of high-speed train steel | |
| CN103510024A (en) | Alloy cast steel for high speed train brake disc, heat treatment method thereof and high speed train brake disc manufactured by the alloy cast steel | |
| CN102312172A (en) | B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof | |
| CN113862434B (en) | Heat treatment process of 35CrNi3MoVR material for thick-wall ultrahigh-pressure container | |
| CN104907470A (en) | 13Cr9Mo2Co1NiVNbNB steel forged piece manufacturing method | |
| CN106756509B (en) | A kind of high-temperature alloy structural steel and its Technology for Heating Processing | |
| CN102953008A (en) | Alloy forged steel and its heat treatment method and use | |
| CN105296881A (en) | Stainless heat resistant steel for turbine disc of large gas turbine and manufacturing method of forging thereof | |
| CN106967929A (en) | A kind of EMUs brake disc forging mild steel and its heat treatment method | |
| CN103642996A (en) | Manufacturing method and thermal treatment method of alloy steel forge piece | |
| CN107760838B (en) | A kind of brake disc of high-speed train Heat-Treatment of Steel method | |
| CN102527892B (en) | Manufacturing method of martensitic stainless steel forged piece with high electric resistivity and high magnetic conductivity | |
| CN104451086A (en) | Method of manufacturing rotor to be used for steam turbine | |
| CN103572176B (en) | A kind of low-carbon martensitic steels and prepare the method for suspension ring | |
| CN102643975A (en) | Heat treatment method for grain refinement of NiCrMoV steel forging piece | |
| CN106555038A (en) | Improve the spheroidizing method of high alloy magnesium iron mechanical performance | |
| CN104831170A (en) | High pressure boiler 12Cr2Mo seamless steel pipe material and heat treatment method thereof | |
| CN103911493A (en) | Forged NiCrMoV steel piece heat-treatment method and forged piece | |
| CN107794348A (en) | A kind of Technology for Heating Processing of raising Cr12MoV steel combination properties | |
| CN105821184B (en) | A kind of heat treatment method of low chromium nickel heat-resisting steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170405 |