缺口取向和再結晶對一種定向凝固鈷基高溫合金熱疲勞性能的影響
發(fā)布時間:2018-07-13 20:32
【摘要】:在定向凝固鈷基高溫合金中采用V型缺口分別垂直和平行于凝固方向的板狀熱疲勞試樣,并在缺口位置預制再結晶組織,研究了在最高溫度為1000℃,最低溫度為室溫的冷熱循環(huán)下,缺口取向和再結晶對定向凝固鈷基高溫合金熱疲勞性能的影響.結果表明,缺口取向垂直于凝固方向時,基體在應力作用下循環(huán)氧化開裂;缺口平行于凝固方向時,熱疲勞性能下降,裂紋沿枝晶間擴展.再結晶降低定向凝固鈷基高溫合金的熱疲勞性能,再結晶晶界氧化開裂,晶界析出的M23C6型碳化物氧化脫落后形成的孔洞加速了裂紋擴展;連接枝晶間碳化物的再結晶晶界成為缺口平行于凝固方向時熱疲勞裂紋的優(yōu)先擴展通道.
[Abstract]:The plate-like thermal fatigue specimens with V notches perpendicular to the solidification direction and parallel to the solidification direction were used in directionally solidified cobalt-based superalloys. The recrystallization microstructure was prefabricated at the notch position, and the highest temperature was 1000 鈩,
本文編號:2120658
[Abstract]:The plate-like thermal fatigue specimens with V notches perpendicular to the solidification direction and parallel to the solidification direction were used in directionally solidified cobalt-based superalloys. The recrystallization microstructure was prefabricated at the notch position, and the highest temperature was 1000 鈩,
本文編號:2120658
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