丁智张军王常帅苏海军刘林傅恒志
金属学报
doi:10.3724/SP.J.1037.2010.00544
研究了熔体超温处理工艺对DZ125镍基高温合金铸态及热处理态高温持久试样位错组态的影响. 结果表明: 铸态试样的高温持久寿命随熔体超温处理温度的升高而增加. 热处理态试样的高温持久寿命随超温处理温度的升高表现为先增加后减少, 当超温处理温度为 1650℃时, 持久寿命达到最大值. 随熔体超温处理温度的升高, 铸态试样位错密度增大且位错多呈波浪形和不规则网络状分布, 热处理态试样中出现规则的多边形位错网, 有利于持久性能的提高. 位错网中位错的Burgers矢量为a/2<110>和 a<100>. 高温持久变形机制为位错的切割或攀移. 随超温处理温度的升高, 切入γ'相的位错数量减少, 并且有位错列和位错对列攀移通过γ'相.
关键词:
熔体超温处理
,
high temperature stress rupture life
,
dislocation configuration
,
Ni-based superalloy
XIAO Lin
,
GU Haicheng
,
KUANG Zhenbang(Xi'an Jiaotong University
,
China)Manuscript received 22 February 1995
金属学报(英文版)
Fatigue lifetime curves of Zircaloy-4 at different temperatures were measured, and the fatigued dislocation configurations were investigated using transmission electron microscopy. Ii was found that prismatic slip is the primary deformation mode. for Zircaloy-4fatigued at RT prismatic plus Pyramidal slip at 400℃,and prismatic plus (0001) basic slip at 600℃. The corresponding dislocation configurations are parallel dislocation lines al RT, elongated cells at 400℃ and two sets of mutually Perpendicular dislocation bands at 600℃.respectively. The relationship among. fatigue deformation mode, dislocation configuration and lifetime is discussed.
关键词:
: Zircaloy-4
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