CN106498131A - A kind of heat treatment method of high intensity ZG40Mn2 material - Google Patents

A kind of heat treatment method of high intensity ZG40Mn2 material Download PDF

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Publication number
CN106498131A
CN106498131A CN201611045022.5A CN201611045022A CN106498131A CN 106498131 A CN106498131 A CN 106498131A CN 201611045022 A CN201611045022 A CN 201611045022A CN 106498131 A CN106498131 A CN 106498131A
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CN
China
Prior art keywords
zg40mn2
materials
high intensity
heat treatment
incubated
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Pending
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CN201611045022.5A
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Chinese (zh)
Inventor
苏黎
徐小静
刘文东
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Zunyi Jinye Machinery Casting Co Ltd
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Zunyi Jinye Machinery Casting Co Ltd
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Priority to CN201611045022.5A priority Critical patent/CN106498131A/en
Publication of CN106498131A publication Critical patent/CN106498131A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn

Abstract

This application discloses a kind of heat treatment method of the high intensity ZG40Mn2 material in Field of Heat-treatment, including following step:Step one:ZG40Mn2 materials is put into and be preheated in shaft furnace 670 ~ 710 DEG C, and be incubated 50 ~ 70min;Step 2:800 ~ 840 DEG C are again heated on the basis of step one, are incubated 70 ~ 90min, are obtained primary ZG40Mn2 materials;Step 3:Subsequently primary ZG40Mn2 materials are put to 7%~9% quenching liquid that oil temperature is 30~70 DEG C and is quenched, obtain intermediate ZG40Mn2 materials;Step 4:Intermediate ZG40Mn2 materials are taken out from quenching liquid, place and cooled down in atmosphere, it is re-fed in bench vehicle type electrical resistance furnace, being heated to 530 ~ 590 DEG C after being cooled to room temperature, being air cooled to room temperature after 110 ~ 130min of insulation carries out high tempering, obtains high intensity ZG40Mn2 material.

Description

A kind of heat treatment method of high intensity ZG40Mn2 material
Technical field
The present invention relates to Field of Heat-treatment, and in particular to a kind of heat treatment method of high intensity ZG40Mn2 material.
Background technology
The special ZG40Mn2 materials of high intensity are mainly used in certain model special type heavy-duty car deflecting roller group parts thereof etc. Aerospace field, its mechanical property is:Tensile strength sigma b >=885MPa, yield strength σ S >=735MPa, under arms during It is often required to bear larger shock loading.Long-time is in this working environment, if only pursue improving intensity and toughness plasticity not Foot, in the case of material yield strength often in loading stress far below steel, because there is brittle fracture in instable growth of crack.
ZG40Mn2 is the one kind in cast steel, and ZG40Mn2 materials belong to high strength steel, and feature is:There is high intensity, and good Quenching degree well, toughness and welding performance, have higher fatigue limit and anti-repeat impact ability after modifier treatment.The material is fitted Intensity and toughness reguirements higher heavy-duty machinery etc. is preferably manufactured.It requires that such material there must be enough toughness plasticities, Guarantee safe and reliable, thus increase heat treatment each parameter request.Due to the particularity of the ZG40Mn2 materials, if warm Degree control is bad so that tissue can change with the drastically change of temperature too fast and so that interior tissue austenite crystal is thick leads Cause hardness height, the poor toughness of workpiece;And the martensitic structure obtained during because quickly cooling down in quenching liquid, and martensite Organize usual fragility larger, for the ZG40Mn2 material sub-eutectoid steel, if hardening heat underheat and failing formed completely difficult to understand Family name's body, causes the hardness deficiency of steel, if heating-up temperature is too high, because of Austenite Grain Growth, the martensitic structure after quenching is also thick Greatly, the fragility that increased steel causes steel part crackle and the tendency of deformation to increase, or even cracking.
Due to knuckle in heavy-duty car deflecting roller group parts, it is coupled the shape and structure of section is complicated and wall unevenness is even etc. Feature, and the type component is for a long time under the operating mode of high-speed overload, high to mechanical property requirements, not only need intensity, hardness high, And good plasticity and toughness is needed, this adds increased the difficulty of casting so that the qualification rate of such foundry goods is low.And due to The particularity of ZG40Mn2 materials, the particularity of its material show that manganese content is 1.6%~1.8%, and manganese content is significantly improved to be quenched Permeability, refines pearlitic structrure, improves hardness and wearability, reduces the plastic brittle transition temperature of steel, inductile not dropping Under the conditions of improve intensity.Again as the quenching degree of the material is good, hardening crack and the change of product is easily caused in heat treatment process Shape.Such foundry goods all after modifier treatment in the state of use, and belong to the quenched manganese steel of middle carbon, the intensity of steel-casting, plasticity Good with all higher machinability of wearability and heat treatment processing properties, the diameter of up to 20~42mm of critical through hardening in oil, but Temper brittleness, and superheated susceptivity is there is, and steel-casting cracking is easily caused in quenching.
Content of the invention
The invention is intended to provide a kind of heat treatment method of high intensity ZG40Mn2 material, with obtain intensity and toughness all compared with Good ZG40Mn2 materials.
A kind of heat treatment method of the high intensity ZG40Mn2 material in this programme, including following step:
Step one:ZG40Mn2 materials is put into and be preheated in shaft furnace 670 ~ 710 DEG C, and be incubated 50 ~ 70min;
Step 2:800 ~ 840 DEG C are again heated on the basis of step one, are incubated 70 ~ 90min, are obtained primary ZG40Mn2 materials Material;
Step 3:Subsequently primary ZG40Mn2 materials are put to 7%~9% quenching liquid that oil temperature is 30~70 DEG C and is quenched, obtain Intermediate ZG40Mn2 materials;
Step 4:Intermediate ZG40Mn2 materials are taken out from quenching liquid, after being cooled to room temperature, bench vehicle type electrical resistance furnace is re-fed into In be heated to 530 ~ 590 DEG C, be air cooled to room temperature and carry out high tempering after 110 ~ 130min of insulation, obtain high intensity ZG40Mn2 material Material.
The beneficial effect of this programme:The invention has the beneficial effects as follows:Added using 670 ~ 710 DEG C of 50 ~ 70min of insulation are preheated to Heat is incubated 70 ~ 90min to 800 ~ 840 DEG C, and after preheating insulation, the process of heating and heat preservation can make ZG40Mn2 materials microstructures again Slowly change and complete austenitizing, and 800 ~ 840 DEG C of critical temperatures for sub-eutectoid steel complete austenitizing, can achieve completely Austenitizing, and the crystal grain of austenite structure will not be made to grow up, the austenite crystal of gained is tiny, quickly cools down in quenching liquid During the martensitic structure that obtained also tiny, so as to improve the intensity and hardness of ZG40Mn2 materials, and can improve The toughness of ZG40Mn2 materials, reduces the tendency of ZG40Mn2 material cracks and deformation.
The selection of another 7%~9% quenching liquid is also one of key, and 7%~9% quenching liquid can make ZG40Mn2 materials ratio in water Rate of cooling low, quench ZG40Mn2 materials crackle, deformation tendency little, prevent steel part ftracture;The present invention selects to be heated to 530 ~ 590 DEG C, the high tempering of room temperature is air cooled to after being incubated 110 ~ 130min so that in the ZG40Mn2 material structures after quenching Cementite is separated out, and the cementite is in acinous, stress concentration is not likely to produce under load effect, so that ZG40Mn2 materials Toughness significantly improve;Therefore the ZG40Mn2 materials through modifier treatment of the present invention can obtain intensity and toughness is all preferably comprehensive Mechanical property.
Further, cooled down using natural wind in the step 4.As ZG40Mn2 material surfaces are stained with quenching Liquid, due to carrying combustion adjuvant oxygen in natural wind, after oxygen and the quenching fluid contacts of high temperature so that quenching liquid burns, Cause the quenching liquid loss of ZG40Mn2 material surfaces adhesion, it is ensured that ZG40Mn2 material surfaces do not have impurities left.
Specific embodiment
Below by specific embodiment, the present invention is further detailed explanation:
Embodiment 1:
A kind of heat treatment method of high intensity ZG40Mn2 material, including following step:
Step one:670 DEG C are preheated in the 75KW shaft furnaces that ZG40Mn2 materials are put into DRZ-100C models, and are incubated 50min;
Step 2:Continue 800 DEG C to be again heated in the 75KW shaft furnaces of DRZ-100C models on the basis of step one, be incubated 70min, obtains primary ZG40Mn2 materials;
Step 3:Subsequently primary ZG40Mn2 materials are put to the quenching liquid of 7% that oil temperature is 30 DEG C and quenched, obtain middle rank ZG40Mn2 materials;
Step 4:Intermediate ZG40Mn2 materials are taken out from quenching liquid, is placed and is cooled down in atmosphere, be cooled to room temperature 530 DEG C are heated in the bench vehicle type electrical resistance furnace for being re-fed into RT3-260-18 models afterwards, be air cooled to room temperature and enter after insulation 110min Row high tempering, obtains high intensity ZG40Mn2 material.
Embodiment 2:
A kind of heat treatment method of high intensity ZG40Mn2 material, including following step:
Step one:690 DEG C are preheated in the 75KW shaft furnaces that ZG40Mn2 materials are put into DRZ-100C models, and are incubated 60min;
Step 2:Continue 820 DEG C to be again heated in the 75KW shaft furnaces of DRZ-100C models on the basis of step one, be incubated 80min, obtains primary ZG40Mn2 materials;
Step 3:Subsequently primary ZG40Mn2 materials are put to the quenching liquid of 8% that oil temperature is 50 DEG C and quenched, obtain middle rank ZG40Mn2 materials;
Step 4:Intermediate ZG40Mn2 materials are taken out from quenching liquid, is placed and is cooled down in atmosphere, be cooled to room temperature 570 DEG C are heated in the bench vehicle type electrical resistance furnace for being re-fed into RT3-260-18 models afterwards, be air cooled to room temperature and enter after insulation 120min Row high tempering, obtains high intensity ZG40Mn2 material.
Embodiment 3:
A kind of heat treatment method of high intensity ZG40Mn2 material, including following step:
Step one:710 DEG C are preheated in the 75KW shaft furnaces that ZG40Mn2 materials are put into DRZ-100C models, and are incubated 70min;
Step 2:Continue 840 DEG C to be again heated in the 75KW shaft furnaces of DRZ-100C models on the basis of step one, be incubated 90min, obtains primary ZG40Mn2 materials;
Step 3:Subsequently primary ZG40Mn2 materials are put to the quenching liquid of 9% that oil temperature is 70 DEG C and quenched, obtain middle rank ZG40Mn2 materials;
Step 4:Intermediate ZG40Mn2 materials are taken out from quenching liquid, is placed and is cooled down in atmosphere, be cooled to room temperature 590 DEG C are heated in the bench vehicle type electrical resistance furnace for being re-fed into RT3-260-18 models afterwards, be air cooled to room temperature and enter after insulation 130min Row high tempering, obtains high intensity ZG40Mn2 material.
After being tested using this programme, after industry standard and traditional handicraft contrast, the related data of table 1 is drawn:
After the data in table 1 are can be seen that using this programme, the various performances of ZG40Mn2 materials are above national standard While, also above the standard of traditional handicraft.
Above-described is only embodiments of the invention, and in scheme, the known general knowledge here such as concrete structure and characteristic is not made Excessive description.It should be pointed out that for a person skilled in the art, on the premise of without departing from present configuration, can be with Some deformations and improvement is made, these should also be considered as protection scope of the present invention, these are implemented all without the impact present invention Effect and practical applicability.This application claims protection domain should be defined by the content of its claim, in description Specific embodiment etc. records the content that can be used for explaining claim.

Claims (2)

1. a kind of heat treatment method of high intensity ZG40Mn2 material, it is characterised in that:Including following step:
Step one:ZG40Mn2 materials is put into and be preheated in shaft furnace 670 ~ 710 DEG C, and be incubated 50 ~ 70min;
Step 2:800 ~ 840 DEG C are again heated on the basis of step one, are incubated 70 ~ 90min, are obtained primary ZG40Mn2 materials Material;
Step 3:Subsequently primary ZG40Mn2 materials are put to 7%~9% quenching liquid that oil temperature is 30~70 DEG C and is quenched, obtain Intermediate ZG40Mn2 materials;
Step 4:Intermediate ZG40Mn2 materials are taken out from quenching liquid, after being cooled to room temperature, bench vehicle type electrical resistance furnace is re-fed into In be heated to 530 ~ 590 DEG C, be air cooled to room temperature and carry out high tempering after 110 ~ 130min of insulation, obtain high intensity ZG40Mn2 material Material.
2. the heat treatment method of high intensity ZG40Mn2 material according to claim 1, it is characterised in that:The step 4 Middle cooled down using natural wind.
CN201611045022.5A 2016-11-24 2016-11-24 A kind of heat treatment method of high intensity ZG40Mn2 material Pending CN106498131A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107052244A (en) * 2017-04-10 2017-08-18 遵义金业机械铸造有限公司 A kind of lost-foam casting method of ZG40Mn2 materials

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141328A (en) * 1982-02-13 1983-08-22 Nisshin Steel Co Ltd Manufacture of high strength high toughness steel
CN1057679A (en) * 1990-06-16 1992-01-08 鞍山钢铁公司 Steel for sucker rod and processing method
CN1072727A (en) * 1991-11-25 1993-06-02 王晶华 The heat treating method of medium carbon manganese steel and low carbon manganese steel finished product
CN105154764A (en) * 2015-09-18 2015-12-16 鞍钢集团矿业公司 Light-weight high manganese steel lining plate for crusher and preparation method of light-weight high manganese steel lining plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141328A (en) * 1982-02-13 1983-08-22 Nisshin Steel Co Ltd Manufacture of high strength high toughness steel
CN1057679A (en) * 1990-06-16 1992-01-08 鞍山钢铁公司 Steel for sucker rod and processing method
CN1072727A (en) * 1991-11-25 1993-06-02 王晶华 The heat treating method of medium carbon manganese steel and low carbon manganese steel finished product
CN105154764A (en) * 2015-09-18 2015-12-16 鞍钢集团矿业公司 Light-weight high manganese steel lining plate for crusher and preparation method of light-weight high manganese steel lining plate

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
吴玉逢等: "ZG40Mn2铸钢的热处理工艺研究", 《热加工工艺》 *
支道光主编: "《实用热处理工艺守则》", 31 May 2013 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107052244A (en) * 2017-04-10 2017-08-18 遵义金业机械铸造有限公司 A kind of lost-foam casting method of ZG40Mn2 materials

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Application publication date: 20170315