Preparation method of molybdenum alloys for isothermal forging die

An isothermal forging and molybdenum alloy technology, which is applied in the field of molybdenum alloy material preparation, can solve the problems of low performance and poor alloy composition uniformity, and achieve the effect of low oxygen content, good performance and uniform chemical composition

Active Publication Date: 2015-04-15
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the conventional preparation method of TZM alloy used as an isothermal forging die is to use titanium hydride and zirconium hydride as additives, prepare according to an appropriate ratio, and then undergo pressing, sintering, corresponding forging processing and heat treatment. The uniformity of the alloy composition is poor , low performance

Method used

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  • Preparation method of molybdenum alloys for isothermal forging die
  • Preparation method of molybdenum alloys for isothermal forging die
  • Preparation method of molybdenum alloys for isothermal forging die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: 5000g of molybdenum powder with a Fischer particle size of 3.5 μm, 35.43 g of titanium carbide powder with a Fischer particle size of 2.0 μm, 6.7 g of zirconium carbide powder with a Fischer particle size of 2.0 μm, and zirconium hydride with a Fischer particle size of 2.0 μm 0.3g of powder and 0.52g of carbon powder of -325 mesh were placed in a three-dimensional mixer and mixed evenly to obtain alloy powder. The mixing time was 8h;

[0031] Step 2, cold isostatic pressing the alloy powder described in step 1 to obtain a compact with a diameter of 50 mm; the pressing pressure is 250 MPa, and the holding time is 4 minutes;

[0032] Step 3. Place the compact described in step 2 in a sintering furnace, first heat the sintering furnace under vacuum conditions, and when the temperature in the furnace rises to 1850°C, keep it warm for 3 hours, and the heating time is 16 hours, and then heat it to the sintering furnace Introduce hydrogen with a flow rate of 60L / h, con...

Embodiment 2

[0040] Step 1: Put 5000g of molybdenum powder with a Fisherman’s particle size of 2.0 μm, 25.83 g of titanium carbide powder with a Fisher’s particle size of 3.0 μm, 6.35 g of zirconium hydride powder with a Fisher’s particle size of 5.0 μm and 1.02 g of -325 mesh carbon powder in the Mix evenly in a three-dimensional mixer to obtain alloy powder, and the mixing time is 24 hours;

[0041]Step 2, cold isostatic pressing the alloy powder described in step 1 to obtain a compact with a diameter of 50mm; the pressing pressure is 200MPa, and the holding time is 8min;

[0042] Step 3. Place the compact described in step 2 in a sintering furnace, first heat the sintering furnace under vacuum conditions, and when the temperature in the furnace rises to 1700°C, keep it warm for 4 hours, and the heating time is 15 hours, and then heat it to the sintering furnace Introduce hydrogen with a flow rate of 70L / h, continue to heat up to 1950°C, heat-preserve and sinter for 6 hours, and heat up ...

Embodiment 3

[0050] Step 1: 5000g of molybdenum powder with a Fischer particle size of 5.0 μm, 33 g of titanium carbide powder with a Fischer particle size of 5.0 μm, 3.5 g of zirconium carbide powder with a Fischer particle size of 5.0 μm, and zirconium hydride powder with a Fischer particle size of 3.0 μm 3.0g and -325 mesh carbon powder 0.52g were placed in a three-dimensional mixer and mixed evenly to obtain alloy powder, and the mixing time was 10h;

[0051] Step 2, cold isostatic pressing the alloy powder described in step 1 to obtain a green compact with a diameter of 50 mm; the pressing pressure is 150 MPa, and the holding time is 10 min;

[0052] Step 3. Place the compact described in step 2 in a sintering furnace, first heat the sintering furnace under vacuum conditions, and when the temperature in the furnace rises to 1500°C, keep it warm for 5 hours, and the heating time is 15 hours, and then heat it to the sintering furnace Introduce hydrogen gas with a flow rate of 80L / h, con...

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Abstract

The invention discloses a preparation method of molybdenum alloys for an isothermal forging die. The method includes the steps that first, molybdenum powder, additive powder, auxiliary additive powder and carbon powder are placed in a blender mixer to be evenly mixed so that alloy powder can be obtained, wherein the additive powder is titanium carbide and / or zirconium carbide; second, the alloy powder is pressed into pressed compact; third, the pressed compact is placed into a sintering furnace to be sintered, and after the pressed compact is cooled along with the furnace, molybdenum alloy blank is obtained; fourth, multi-pass drawing is conducted on the molybdenum alloy blank, and then multi-pass upsetting is carried out on the drawn molybdenum alloy blank; fifth, annealing treatment is conducted on the upset molybdenum alloy blank, and the molybdenum alloys for the isothermal forging die can be obtained after the molybdenum alloy blank is cooled along with the furnace; or the step four is repeated for one to two times for the upset molybdenum alloy blank, then the annealing treatment is conducted, and the molybdenum alloys for the isothermal forging die can be obtained after the molybdenum alloy blank is cooled along with the furnace. By means of the method, the prepared molybdenum alloys are even in structure and good in performance, and the molybdenum alloys are obviously superior to molybdenum alloys of the same kind prepared through an existing conventional method.

Description

technical field [0001] The invention belongs to the technical field of molybdenum alloy material preparation, and in particular relates to a method for preparing molybdenum alloy for isothermal forging dies. Background technique [0002] Isothermal deformation is the main forming process of high-temperature structural material parts, and the key to isothermal forging is the mold material, nickel-based powder superalloy, such as FGH95, FGH96, Rene'95, Rene'88DT, CH-98 and other alloys and more advanced The deformation temperature of intermetallic compounds is above 1050°C, so the research and application of isothermal deformation mold materials used at temperatures above 1050°C is the direction of common concern of relevant professions at home and abroad. [0003] Molybdenum-based alloy has good thermal conductivity, low expansion coefficient and slow softening at high temperature, so the thermal stress is not large during rapid heating and cooling; the small expansion coeffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C27/04C22F1/18
Inventor 付静波杨秦莉庄飞张晓
Owner JINDUICHENG MOLYBDENUM CO LTD
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