首页|Effects of Boron Addition on the Microstructure and Mechanical Properties of γ'-Strengthened Directionally Solidified CoNi-Base Superalloy
Effects of Boron Addition on the Microstructure and Mechanical Properties of γ'-Strengthened Directionally Solidified CoNi-Base Superalloy
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The effects of B addition on microstructure and mechanical properties of a γ'-strengthened CoNi-base superalloy are inves-tigated.The addition of B leads to a substantial increase in the volume fraction of both the eutectic structure and borides.The CoNi-base alloy shows a high solubility limit for the element B.Borides become noticeable in the area surrounding the eutectic structure after the B level exceeds 0.46 at.％ .It is found that the compression property and stress rupture life of the 4W2Ta alloys exhibit an initial rise followed by a subsequent drop as the B content gradually increases from 0.08 to 0.78 at.％ .The 4W2Ta0.46B alloy demonstrates the most excellent high-temperature strength and stress rupture life,revealing that a moderate amount of B in the alloy noticeably enhances its mechanical properties by enhancing the grain boundary cohesion.
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