熱等靜壓對(duì)K4169高溫合金組織與性能的影響Effect of hot isostatic pressing on microstructures and properties of superalloy K4169

對(duì)K4169高溫合金鑄件后處理工藝進(jìn)行研究，通過(guò)拉伸試驗(yàn)、持久和疲勞測(cè)試，并結(jié)合光學(xué)顯微鏡、掃描電鏡和透射電鏡分析，研究熱等靜壓處理對(duì)合金組織和綜合力學(xué)性能的影響規(guī)律。結(jié)果表明：1165 ℃、4 h、140 MPa熱等靜壓處理可有效消除鑄態(tài)組織中的顯微疏松和Laves相；與直接進(jìn)行標(biāo)準(zhǔn)熱處理相比，對(duì)合金進(jìn)行熱等靜壓處理后再進(jìn)行固溶、時(shí)效處理，合金組織中γ″相數(shù)量增加，尺寸和分布更加均勻。由于顯微組織的改善，合金室溫和650 ℃抗拉強(qiáng)度和塑性均明顯提高，650 ℃、620 MPa持久壽命由27 h延長(zhǎng)至93 h，低周疲勞性能顯著改善。

The post-processing technology of superalloy K4169 castings was studied. The effects of hot isostatic pressing (HIP) on the microstructure and mechanical properties were investigated by OM, SEM, TEM, tensile, stress rupture and fatigue tests. The results indicate that the microporosity and Laves phase existing in as-cast structure can be effectively eliminated by HIP at 1165 ℃, 140 MPa for 4 h. After further solution and aging treatment based on as-HIP, γ″ phase increases in the amount and turns uniform in the size and distribution. Therefore, the strength and ductility increase at both room-temperature and 650 ℃, the stress rupture life at 650 ℃ and 620 MPa is enhanced to 93 h from 27 h and low cycle fatigue performance is improved notably.

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