DD406

HuaNickel DD406 is a second-generation nickel-based single-crystal superalloy developed in China, which has the advantages of high temperature strength, good comprehensive performance, stable structure and good casting process performance. Compared with the second-generation single-crystal superalloys PWA1484, RenéN5 and CMSX-4 used abroad, its Tensile properties, durability, creep performance, oxidation resistance and hot corrosion resistance have reached or even partially exceeded its level, and it has the advantage of low cost because of its low Re content. The alloy has a durable strength of σ¹ ≥100 h, o ≥ 100 h, and is suitable for making high-temperature parts such as turbine working blades working below 1100°C and guide vanes working below 1150°C for gas turbines with complex inner cavities.

DD406  Chemical composition：

Ti Cr Co W Mo AI Nb Ta Re Hf Ti Fe B Zr Mn Si S
Min Bal 3.8 8.5 7 1.5 5.2 0.6 6 1.6 0.05 ≤
Max 4.8 9.5 9 2.5 6.2 1.2 8.5 2.4 0.15 0.1 0.2 0.02 0.1 0.15 0.2 0.001

DD406 Physical properties：

Density 8.78g/cm³
Melting point 1342℃~1399℃
Magnetic properties not

Coefficient of linear expansion

θ/℃ 20～300 20～400 20～500 20～600 20～700
α/(10-6℃-I) 11.92 12.59 12.93 13.15 13.53
θ/℃ 20～800 20～900 20～1000 20～1100 20～1200
α/(10-6℃-I) 14.19 14.39 15.00 15.76 16.75

Resilient performance

θ/℃ 25 650 700 760 850 980 1070 1100
 

E/GPa

 [001] 131.5 107.5 107 105.5 98 80.5 69.5 67.5
[011] 231.5 — 184.5 187.5 137.5 145 130 121
[111] 327 — 212 184.5 205 217.5 189 176.5

DD406 Mechanical properties：

Standard number Variety sampling Long-lasting performance Tensile properties
θ/℃ σ/MPa τ/h θ/℃ σb/MPa σp0.2/MPa δ₅/% ψ/%
 

Q/6S 1678

  

Master alloy

 [001]Monocrystalline test sticksStandard heat treatment 980 250 ≥100 20 ≥880 ≥800 ≥8 ≥12
1070 140 ≥100 760 ≥1000 ≥850 ≥5 ≥6
1100 130 ≥100 980 ≥700 ≥600 ≥18 ≥22

DD406 Alloy properties：

DD406 is a second-generation nickel-based single-crystal superalloy, which has the advantages of high high temperature strength, good comprehensive performance, stable structure and good casting process performance.

DD406 Uses of alloys：

HuaNickel DD406 alloy has been selected for the fabrication of turbine working and guide vanes for a variety of advanced aero engines.

DD406 Process performance：

Parts Heat treatment: The blades with unprocessed surface should be treated with argon protection or vacuum, and then forced cooling by argon blowing, and the cooling rate should be greater than 260°C/min.

Relevant standards：

GB/T  14992 、Q/6S 1678

Detail datasheet