Method for preparing oxide dispersion strengthened alloy by rapid forming

Method for preparing oxide dispersion strengthened alloy by rapid forming

  • CN 103,008,657 A
  • Filed: 01/13/2013
  • Published: 04/03/2013
  • Est. Priority Date: 01/13/2013
  • Status: Active Application
First Claim
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1. a Quick-forming prepares the method for oxide-dispersed alloy, it is characterized in that:

  • Step 1, carry out weighing according to the composition proportion of ODS alloy of design, raw material is parent metal powder, alloying element powder, Y 2O 3Particle, oxide Refining Elements, perhaps raw material is parent metal powder, substrate metal oxide powder, hydrogenation yttrium powder, alloying element powder, oxide Refining Elements;

    The raw material premixed is even, then in high-purity Ar atmosphere by high-energy ball milling with 0.3 ~ 2.5wt.%Y 2O 3Uniform particles is dispersed in the matrix, and ball/material is than being (15 ~

         20)/1, and the rotating speed of ball mill is 380 ~ 500 rev/mins, and Ball-milling Time is 36 ~ 72 hours, and obtaining average grain diameter is the ODS alloy powder of 20 ~ 85 μ

    m;

    Step 2, utilize the three-dimensional entity model of CAD Software for Design part, and adopt slicing treatment software that the cad model of described part is carried out the hierarchy slicing processing, it is dispersed turn to a series of two-dimentional aspects, and the two-dimensional layer surface information is sent in the control system of SLM forming machine;

    The shop powder system of SLM forming machine is at workbench tiling one deck ODS alloy powder, and slice thickness is 0.1 ~ 0.3mm, and the preheat temperature of powder bed is 120 ~ 200 ℃

    ;

    According to slice information, laser beam carries out selective laser melting with the sweep span of the sweep speed of the power of 200 ~ 300W, 0.1 ~ 0.3m/s, 0.10 ~ 0.25mm to the mechanical alloying powder and obtains, thereby obtains the laser fast forming base substrate of complicated shape;

    Step 3, the laser fast forming base substrate is carried out hip treatment, eliminate residual porosity in the laser fast forming base, hip temperature is 900 ~ 1200 ℃

    , and high temperature insostatic pressing (HIP) pressure is 100 ~ 200MPa, temperature retention time is 1 ~ 4 hour, obtains fully dense ODS alloy base substrate;

    Step 4, fully dense ODS alloy base substrate is carried out annealing in process or solid solution+Ageing Treatment, obtain final ODS alloy parts.

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