Effect of Phosphorus on Mechanical Properties and Thermal Stability of Fine-grained GH761 Alloy

Apposite phosphorus content can improve the mechanical properties of the finegrained GH4133 nickel-base superalloy. The grain size of the alloy was refined to ASTM8—10 grade by controlling the thermal processing and the heat treatment. The tensile specimens fail by intergranular fracture even when the phosphorus level is as high as 0.140% (mass fraction). The yield and ultimate strengths of the refined alloy are 200 and 150 MPa higher than that of the alloy with a standard microstructure of ASTM 4—5 grain size, respectively. And the above two strengths of the alloy with 0.140% phosphorus are 100 and 50 MPa higher than those of the alloy with a industrial controlled phosphorus level, say 0.005%. The impact specimens fail by intragranular fracture when the phosphorus level is below 0.023% and the fracture toughness of the alloy is higher than 70 MJ/m~2. Some parts of the fracture surface of the impact specimen with 0.140% phosphorus exhibited intergranular fracture characteristics and the fracture toughness is lowered to about 40 MJ/m~2. Phosphorus extends the rupture life of the GH4133 alloy and its optimum addition is around 0.011%. The interaction between phosphorus atmosphere and dislocations is discussed to understand the effect of phosphorus on different type of mechanical properties.

Effect of Phosphorus on Mechanical Properties of Fine-Grained GH4133 Nickel Base Superalloy

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Effect of Phosphorus on Mechanical Properties of Fine-Grained GH4133 Nickel Base Superalloy