CN104593705A - ZM61 high strength wrought magnesium alloy heat treatment technology - Google Patents

Abstract

The invention discloses a ZM61 high strength wrought magnesium alloy heat treatment technology. A magnesium alloy with the advantages of low production, easy extrusion molding, strong high temperature creep deformation performance and strong corrosion resistance can be directly cast through the high strength heat treatment technology. The magnesium alloy also has the characteristics of strong damping, shock absorbing and noise reducing ability, superior liquid state formability, and easy recycling, and is especially suitable for automobiles, motorcycles and other vehicles, and the fields of instruments and meters, light industry and the like.

Description

ZM61 high-strength deforming magnesium alloy thermal treatment process

 

Technical field

The invention belongs to casting technology field, be specifically related to a kind of ZM61 high-strength deforming magnesium alloy thermal treatment process.

 

Background technology

Although there is abundant magnesium resource in China, to its research and development and the history widely applied very short, no matter it is all in urgent need to be improved to combine actual research from the exploitation of the novel magnesium alloy trade mark or performance; The high-temperature creep resistance of cast magnesium alloys is poor, is unsuitable for working under the environment more than 120 DEG C for a long time, pure Mg-Zn binary alloy, because its Tc is interval large, easily produce microporosity, and binary alloy corrosion resistance is poor in as cast condition.

 

Summary of the invention

In order to overcome the above-mentioned technical problem that prior art field exists, the object of the invention is to, a kind of ZM61 high-strength deforming magnesium alloy thermal treatment process is provided, can directly Foundry Production extrusion molding with low cost, easy, high temperature creep property and the strong magnesium alloy of corrosion resistance.

ZM61 high-strength deforming magnesium alloy thermal treatment process provided by the invention, comprises the following steps:

(1) utilize vacuum induction melting to prepare and design the alloy cast ingot that ingot casting composition is (Mg-6wt.%Zn-1wt.%), plan furnace charge gross weight 100Kg, calculating gained furnace charge is: magnesium ingot 72.19Kg, Mg-Mn master alloy 23.81kg (manganese content 4.2%), zinc ingot metal 6Kg.After weighing, all raw materials are loaded in the iron crucible of certain size, wait for intensification melting;

(2) close and seal stove and vacuumize, heat up and remain on 700 DEG C, concise 10min, power-off, cooling, let out vacuum, take out crucible with pliers, then put into salt quenching-in water, take out from water, surface sprinkles insulating covering agent, leaves standstill 20min;

(3) semicontinuous blank casting machine is processed into the cylindric bar of Ф 80 × (220 ~ 250) mm, before extruding, alloy ingot casting carries out Homogenization Treatments, and technique is: 330 DEG C × 24h.When homogenizing carries out 21h, mould is put into resistance furnace preheating, after homogenizing terminates, be warming up to preset temp, the ingot casting of homogenizing and mould are continued to be incubated 2h, after homogenizing terminates at such a temperature, bar is come out of the stove immediately and is put into container, be in place by preheated mould simultaneously, start extruding, extrusion bar adopts air cooling;

(4) ingot casting is put into heat treatment furnace to heat-treat, process of thermal treatment parameter is as follows: solid solubility temperature is 400 DEG C ~ 500 DEG C, solid solution soaking time is 1.5h ~ 2h, and the processing parameter of double aging is (90 DEG C ~ 230 DEG C) × (12h ~ 32h), carries out water-cooled afterwards.

 

ZM61 high-strength deforming magnesium alloy thermal treatment process provided by the invention, its beneficial effect is, overcome prior art processing magnesium alloy, production cost is high, not easily extrusion molding, high temperature creep property and the weak shortcoming of corrosion resistance, the technique after optimization is not only produced into cheap, the easy extrusion molding of book, high temperature creep property and corrosion resistance and significantly carries.

 

Embodiment

Below in conjunction with an embodiment, ZM61 high-strength deforming magnesium alloy thermal treatment process provided by the invention is described in detail.

Embodiment

The ZM61 high-strength deforming magnesium alloy thermal treatment process of the present embodiment, comprises the following steps:

(1) utilize vacuum induction melting to prepare and design the alloy cast ingot that ingot casting composition is (Mg-6wt.%Zn-1wt.%), plan furnace charge gross weight 100Kg, calculating gained furnace charge is: magnesium ingot 72.19Kg, Mg-Mn master alloy 23.81kg (manganese content 4.2%), zinc ingot metal 6Kg.After weighing, all raw materials are loaded in the iron crucible of certain size, wait for intensification melting;

(2) close and seal stove and vacuumize, heat up and remain on 700 DEG C, concise 10min, power-off, cooling, let out vacuum, take out crucible with pliers, then put into salt quenching-in water, take out from water, surface sprinkles insulating covering agent, leaves standstill 20min;

(3) semicontinuous blank casting machine is processed into the cylindric bar of Ф 80 × (220 ~ 250) mm, before extruding, alloy ingot casting carries out Homogenization Treatments, and technique is: 330 DEG C × 24h.When homogenizing carries out 21h, mould is put into resistance furnace preheating, after homogenizing terminates, be warming up to preset temp, the ingot casting of homogenizing and mould are continued to be incubated 2h, after homogenizing terminates at such a temperature, bar is come out of the stove immediately and is put into container, be in place by preheated mould simultaneously, start extruding, extrusion bar adopts air cooling;

(4) ingot casting is put into heat treatment furnace to heat-treat, process of thermal treatment parameter is as follows: solid solubility temperature is 420 DEG C, and solid solution soaking time is 2h, and the processing parameter of double aging is 90 DEG C × 12h+180 DEG C × 4h, carries out water-cooled afterwards.

Claims (1)

1. a ZM61 high-strength deforming magnesium alloy thermal treatment process, is characterized in that: said method comprising the steps of:

(1) utilize vacuum induction melting to prepare and design the alloy cast ingot that ingot casting composition is (Mg-6wt.%Zn-1wt.%), plan furnace charge gross weight 100Kg, calculating gained furnace charge is: magnesium ingot 72.19Kg, Mg-Mn master alloy 23.81kg (manganese content 4.2%), zinc ingot metal 6Kg, after weighing, all raw materials are loaded in the iron crucible of certain size, wait for intensification melting;

(2) close and seal stove and vacuumize, heat up and remain on 700 DEG C, concise 10min, power-off, cooling, let out vacuum, take out crucible with pliers, then put into salt quenching-in water, take out from water, surface sprinkles insulating covering agent, leaves standstill 20min;

(3) semicontinuous blank casting machine is processed into the cylindric bar of Ф 80 × (220 ~ 250) mm, before extruding, alloy ingot casting carries out Homogenization Treatments, technique is: 330 DEG C × 24h, when homogenizing carries out 21h, mould is put into resistance furnace preheating, after homogenizing terminates, be warming up to preset temp, the ingot casting of homogenizing and mould are continued to be incubated 2h, after homogenizing terminates at such a temperature, bar is come out of the stove immediately and is put into container, be in place by preheated mould simultaneously, start extruding, extrusion bar adopts air cooling;

(4) ingot casting is put into heat treatment furnace to heat-treat, process of thermal treatment parameter is as follows: solid solubility temperature is 400 DEG C ~ 500 DEG C, solid solution soaking time is 1.5h ~ 2h, and the processing parameter of double aging is (90 DEG C ~ 230 DEG C) × (12h ~ 32h), carries out water-cooled afterwards.