CN104278166B - A kind of method for reducing Iron in Al-Si Alloy phase adverse effect - Google Patents

A kind of method for reducing Iron in Al-Si Alloy phase adverse effect Download PDF

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CN104278166B
CN104278166B CN201310359991.8A CN201310359991A CN104278166B CN 104278166 B CN104278166 B CN 104278166B CN 201310359991 A CN201310359991 A CN 201310359991A CN 104278166 B CN104278166 B CN 104278166B
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alloy
iron
aluminium
phase
melt
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CN104278166A (en
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耿浩然
王庆磊
陈国诗
牟振
张硕
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YANTAI LUTONG PRECISION TECHNOLOGY Co.,Ltd.
University of Jinan
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YANTAI LUTONG PRECISION ALUMINIUM CO Ltd
University of Jinan
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Abstract

The present invention relates to class of metal materials and field of metallurgy, and in particular to a kind of melt treating method for reducing Iron in Al-Si Alloy phase adverse effect:870 DEG C ~ 970 DEG C are superheated to by the 67 90% of the transcocrystallized Al-Si alloy gross weight of iron content, it is incubated 10min ~ 30min, the transcocrystallized Al-Si alloy for the remaining iron content for preheating 50 ~ 200 DEG C is added in overheat aluminium alloy, stirring Quench makes melt temperature be down to 710 DEG C ~ 780 DEG C, by refining, it is cast in after standing in casting mold.Described melt treating method can be used for the silicon alloy of aluminium 13 ~ 23% that iron content is less than 4%.After the thermally treated processing of the silicon alloy of aluminium 15% containing 1.5% iron, the size of primary silicon and strip and block iron phase, which has, largely to be reduced, Needle like Iron Phase disappears substantially, and tensile strength rises to 210MPa or so by 180MPa of before processing or so, and elongation rises to 2.5% or so by 1.6% or so.

Description

A kind of method for reducing Iron in Al-Si Alloy phase adverse effect
Technical field
The present invention relates to class of metal materials and field of metallurgy, and in particular to reduces Iron in Al-Si Alloy to one kind and is mutually harmful to shadow Loud method.
Background technology
Iron is inevitable element in cast aluminium alloy gold.Due to most of equipment used in melting and casting process It is irony, therefore iron is easy to be brought into aluminium liquid.Per remelting once, the iron content in alloy can all increase foundry returns Add, by reuse again and again, the iron-holder in aluminium alloy will be gradually increased.This phenomenon is in casting alloy production Seem especially prominent.β-iron phase of crisp and hard acicular morphology can isolate matrix in alloy, produce stress concentration, destroy Metal Substrate The bonding strength of body, so as to substantially reduce the performance of alloy.
Up to the present, in order to reduce or reduce the adverse effect of Fe-riched phase, two class measures have mainly been taken:The first kind is Using machinery, metallurgical and physics method, try to reduce the content of Iron in Al-Si Alloy, fundamentally prevent harmful Fe-riched phase Produce.Including settling methods, centrifugation removal method, electromagnetic separation, filtration method etc..Second class measure is to use other techniques Change the pattern of Iron in Aluminium Alloy phase with other alloying elements are added, by this means, make crisp and hard Needle like Iron Phase point Solution, crush, or form other intermediate compounds, so as to refine iron phase, reach the purpose for the mechanical property for improving alloy.Often Method has:Neutralize element method, improve cooling rate method, melt overheat method, solid-state heat treating process.In actual production, the above is big Part Methods all have certain limitation, rely heavily on other factorses.For a long time, the research emphasis of people is main Concentrate on improves the pattern of Iron in Aluminium Alloy phase by adding alterant element, to eliminate the harm of Fe phases, such as, manganese is added, Strontium, beryllium, cobalt etc..But the addition of alterant element can cause the air-breathing of aluminium alloy and be mingled with, and influence is made on other performances, And the ununified final conclusion of the optimal addn of some elements, and the addition of alterant element can substantially reduce the recovery profit of aluminium alloy With.
The acquisition of cast alloy materials will be undergone by the process of setting of liquid to solid-state, because liquid metal structure has Change and heredity, the pre-crystallized state of alloy have important influence to final solidified structure and mechanical property.Therefore, lead to Configuration state when crossing control alloy melt solidification can effectively improve the solidified structure of alloy.Alloy melt heat treatment refers to According to alloy melt structure variation with temperature relation and its changing rule in cooling procedure, using certain heat effect Melt structure and its change process is set to change, so as to improve the as-cast structure of alloy, structure and the technical process of performance.Close Golden melt heat treatment can not only improve alloy microstructure, improve the performance of alloy, and can also improve the casting of alloy Make the performance such as performance, corrosion-resistant.
The content of the invention
Hydraulic performance decline caused by order to solve above Iron in Al-Si Alloy phase and alum recovery utilize difficult problem, and the present invention provides A kind of size for reducing Iron in Al-Si Alloy phase, returned so as to improve alloy tensile intensity and elongation and be advantageous to aluminium alloy Receive the alloy melt processing method utilized.
The present invention has good intensity, hardness and body from the hypereutectic aluminium-silicon alloys of iron content as parent, the alloy Product stability, and wear-resisting, good corrosion resistance, it is the ideal material for manufacturing engine piston.In cast Al-Si alloy, iron member Plain inevitably to exist, generally, iron is treated in alusil alloy as impurity, and still, ferro element also has it to have The one side of profit.The intermetallic compound of iron content has preferable heat resistance, and hinders crystal boundary migration, changes alloy recrystallization mistake Journey, suppress grain coarsening.Simultaneously tiny (Al, Fe, Si) ternary phase has the wearability as silicon phase, and with than silicon phase Higher heat resistance, this is favourable for the piston piece made of hypereutectic aluminium-silicon alloys.Iron in Al-Si Alloy contains Gauge is usually no more than 0.7% surely.In order to change the adverse effect of iron phase, and make every effort to be converted into beneficial effect, research employs this The method of melt treatment.By researching and analysing the change of iron content hypereutectic aluminium-silicon alloys melt structure, with melt structure state Information is foundation, chooses the technological parameters such as suitable melt overheat temperature, soaking time, melt Quench mode, is closed by controlling The pre-crystallized state of gold, the tissue and performance of iron content transcocrystallized Al-Si alloy can be improved.
The present invention is achieved by the following measures:
The melt treating method of iron phase adverse effect, comprises the following steps in a kind of reduction hypereutectic aluminium-silicon alloys:
(1)The 67-90% of the hypereutectic aluminium-silicon alloys gross weight of iron content is superheated to 870 DEG C ~ 970 DEG C, insulation 10min ~ 30min, obtain overheating aluminium alloy;
(2)The remaining alloy for being preheating to 50 DEG C ~ 200 DEG C is added in overheat aluminium alloy, quick stirring is carried out at Quench Reason, makes temperature quickly be down to 710 DEG C ~ 780 DEG C, by refining, after stewing process 5min ~ 20min in running castings, produces.
The aluminium that the melt treating method of iron phase adverse effect can be used for iron content to be less than 4% in described elimination aluminium-silicon alloys- 13 ~ 23% silicon alloys.
The melt treating method of iron phase adverse effect makes long in hypereutectic aluminium-silicon alloys in described elimination aluminium-silicon alloys The iron phase of needle-like disappears substantially, and the tensile strength of alloy can reach 165 ~ 230MPa, and elongation is 1.0 ~ 2.5%.
The silicon alloy of aluminium -15% containing 1.5% iron is after melt treatment, and the iron phase of long needle-like substantially disappears under optimum condition, Strip and block iron phase size diminishes, and corner angle passivation, is evenly distributed, mechanical property is improved significantly, and alloy tensile intensity is brought up to 210MPa or so, elongation reach 2.5% or so.

Claims (1)

1. a kind of method for reducing iron phase adverse effect in aluminium-silicon alloys, its feature comprise the following steps:
(1) aluminium-silicon alloys of iron content, gross weight 67-90% are superheated to 870 DEG C~970 DEG C, insulation 10min~30min is obtained Overheat aluminium alloy;
(2) the remaining alloy for being preheating to 50 DEG C~200 DEG C is added in overheat aluminium alloy, stirring Quench processing, drops temperature To 710 DEG C~780 DEG C, by refining, casting mold is poured into after stewing process 5min~20min;
The iron content of the aluminium-silicon alloys is not less than 1.5% and less than 4%, and silicone content is 13~23%;
Methods described makes the iron phase of long needle-like in hypereutectic alloy aluminium-silicon alloys disappear substantially, and the tensile strength of alloy can reach 165~230Mpa, elongation are 1.0~2.5%.
CN201310359991.8A 2013-08-19 2013-08-19 A kind of method for reducing Iron in Al-Si Alloy phase adverse effect Active CN104278166B (en)

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CN104894444A (en) * 2015-06-09 2015-09-09 苏州德翔装饰工程有限公司 Aluminum alloy material for decoration and preparation method of aluminum alloy material
CN104988346B (en) * 2015-07-08 2017-03-29 龙口市丛林铝材有限公司 A kind of preparation method of vehicle body of railway vehicle aluminium alloy
CN106011563A (en) * 2016-05-23 2016-10-12 济南大学 Hypo eutectic aluminum-magnesium alloy reinforcing method through melt compounding treatment
CN106319275B (en) * 2016-10-24 2018-03-20 广东省材料与加工研究所 The alterant and Modification Manners of Fe-riched phase in a kind of secondary aluminium
CN108165810B (en) * 2017-12-11 2019-09-27 昆明理工大学 One-step method removes the device and technique of iron and silicon phase in primary aluminum-silicon alloy

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JPS60165332A (en) * 1984-02-09 1985-08-28 Toyota Central Res & Dev Lab Inc Preparation of cast aluminum alloy article
CN1294282C (en) * 2002-01-28 2007-01-10 西北工业大学 Aluminium alloy melt overheat treatment method
CN101637819A (en) * 2009-08-27 2010-02-03 哈尔滨工业大学 Heat-speed treatment low-temperature pouring method for aluminum silicon alloy
CN102796923B (en) * 2012-09-07 2014-11-05 济南大学 Method for compounding hypereutectic aluminium-silicon alloy melt
CN103060629B (en) * 2013-01-31 2015-11-18 西南铝业(集团)有限责任公司 A kind of metamorphism treatment method of silumin

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