缺口取向和再結(jié)晶對(duì)一種定向凝固鈷基高溫合金熱疲勞性能的影響
發(fā)布時(shí)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(yù)制再結(jié)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(jié)晶對(duì)定向凝固鈷基高溫合金熱疲勞性能的影響.結(jié)果表明,缺口取向垂直于凝固方向時(shí),基體在應(yīng)力作用下循環(huán)氧化開裂;缺口平行于凝固方向時(shí),熱疲勞性能下降,裂紋沿枝晶間擴(kuò)展.再結(jié)晶降低定向凝固鈷基高溫合金的熱疲勞性能,再結(jié)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(kuò)展;連接枝晶間碳化物的再結(jié)晶晶界成為缺口平行于凝固方向時(shí)熱疲勞裂紋的優(yōu)先擴(kuò)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(hào):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(hào):2120658
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