孔隙率對多孔隙17-4PH不鏽鋼動態力學性能之影響

The Effect of Porosity on the Dynamic Mechanical Behavior of 17-4PH Stainless Steel

曾有志(Y.C. Tzeng) ； 許家銘(C.M. Hsu) ； 陳順發(S.F. Chen) ； 李輝隆(H.L. Lee) ； 陳幼良(Y.L. Chen)

《鑛冶：中國鑛冶工程學會會刊》 66卷1期 (2022/03) Pp. 70-78

https://doi.org/10.30069/MM.202203_66(1).06

摘要

本研究主要探討30%、40%及50%孔隙率之17-4PH泡沫鋼動態壓縮力學性能之影響。結果顯示，孔徑約為500μm之30%、40%及50%孔隙率之燒結態17-4PH泡沫鋼經人工時效處理後可析出細小的ε-Cu球狀相，進而使動態壓縮降伏強度獲有效提升。另孔隙率越小泡沫鋼能量吸收的能力則越顯著。藉由霍普金森的單波法與三波法分析得知，17-4PH泡沫鋼可有效弱化應力波的透射而達到耗散能量的效果外，泡沫鋼可吸收2200～2800焦耳（J）之子彈衝擊動能，其中以30%孔隙率之17-4PH泡沫鋼具有最佳吸能之效果。

關鍵字

孔隙率 ； 17-4PH不鏽鋼 ； 衝擊試驗 ； 能量耗散

並列摘要

Porous 17-4PH stainless steel with three different porosities, fixed pore size (500 μm), and uniform structure are prepared by pressureless space holder method. The microstructure characteristics and compressive behaviors of the porous 17-4PH specimens are investigated. The results show that the compression yield strength of the sintered porous 17-4PH stainless steel dramatically increases due to the precipitation of ε- Cu spherical phases precipitated after aging treatment. The smaller the porosity, the more significant energy absorption capacity of porous steel. In addition, the impact performance of porous 17-4PH stainless steel has been studied via using a direct impact Hopkinson bar. Testing results reveal that porous 17-4PH stainless steel can effectively weaken the transmission of stress wave and achieve the purpose of dissipating energy.

並列關鍵字

porosity ； 17-4PH stainless steel ； impact test ； energy dissipation

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