粉末高溫合金FGH96原始顆粒邊界及高溫原位高周疲勞研究

粉末高溫合金FGH96原始顆粒邊界及高溫原位高周疲勞研究Prior Particle Boundary of PM FGH96 Superalloy and Its In-situ High-cycle Fatigue at Elevated Temperature

利用掃描電鏡原位觀察的方法研究了粉末高溫合金FGH96中不同級(jí)別的原始顆粒邊界（PPB）在550℃下對(duì)合金高周疲勞力學(xué)行為的影響。結(jié)果表明：采用等離子旋轉(zhuǎn)電極（PREP）制粉+熱等靜壓（HIP）工藝制備的FGH96合金中PPB主要由大尺寸γ'相和碳化物組成；不同級(jí)別的PPB對(duì)高周疲勞裂紋萌生和擴(kuò)展均無(wú)顯著影響，裂紋萌生于晶粒內(nèi)部，裂紋擴(kuò)展受晶界與應(yīng)力軸角度影響，穿晶或沿晶擴(kuò)展；在裂紋快速擴(kuò)展區(qū)和瞬斷區(qū)，PPB級(jí)別嚴(yán)重的FGH96合金斷口呈現(xiàn)穿晶和沿PPB斷裂的形貌。

The influence of different grades of prior particle boundary (PPB) in PM FGH96 superalloy during high-cycle fatigue test at 550 ℃ was investigated by the in-situ fatigue test in SEM. The results show that the PPB in P/M FGH96 superalloys by plasma rotating electrode process (PREP) + hot isostatic press (HIP) is constituted of large size γ' and carbide. There are no significant effect on the initiation and propagation of high cycle fatigue crack in different grades of PPB. Crack initiation is initiated in the grain interior, and the propagation is transgranular or intergranular, which is influenced by the angle between the grain boundary and the stress axis. In the fast crack growth zone and the transient zone, the fracture characteristics of serious grade PPB FGH96 superalloy are transgranular and along PPB globular surfaces.

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