先进镍基粉末高温合金<strong>FGH4108</strong>在不同应力条件下的蠕变行为

Processing math: 100%

先进镍基粉末高温合金FGH4108在不同应力条件下的蠕变行为

李新宇, 白佳铭, 张浩鹏, 李晓鲲, 贾建, 刘常升, 刘建涛, 张义文

Creep Behavior of Advanced Powder Metallurgy Nickel-Based Superalloys FGH4108 Under Different Stress Conditions

LI Xinyu, BAI Jiaming, ZHANG Haopeng, LI Xiaokun, JIA Jian, LIU Changsheng, LIU Jiantao, ZHANG Yiwen

表2 在700 ℃下粗晶和细晶FGH4108合金的最小蠕变速率和各蠕变阶段的应变和时间

Table 2 Minimum creep rates (

${\dot{ε}}_{m}$

) and strains and time of creep stages of the coarse grain and fine grain samples at 700 ^oC

Sample	Stress MPa	${\dot{ε}}_{m}$ s^-1	First stage				Second stage				Third stage
Sample	Stress MPa	${\dot{ε}}_{m}$ s^-1	ε₁ %	ε₁ / ε %	t₁ h	t₁ / t_r %	ε₂ %	ε₂ / ε %	t₂ h	t₂ / t_r %	ε₃ %	ε₃ / ε %	t₃ h	t₃ / t_r %
Coarse grain	900	1.02 × 10^-7	0.7	29.1	14.2	23.2	1.7	70.8	47.0	76.8	-	-	-	-
	810	2.19 × 10^-8	0.3	12.5	17.0	6.8	2.1	87.5	233.0	93.2	-	-	-	-
	780	8.15 × 10^-9	0.5	10.2	145.5	14.8	0.6	12.2	166.3	16.9	3.8	77.6	670.2	68.2
Fine grain	900	7.77 × 10^-7	1.1	23.4	3.8	27.1	0.7	14.9	2.4	17.1	2.9	61.7	7.8	55.7
	810	9.53 × 10^-8	0.6	6.9	15.6	14.9	0.9	10.3	18.9	18.0	7.2	82.8	70.5	67.1
	780	7.61 × 10^-8	0.4	9.3	11.6	13.4	0.4	9.3	13.7	15.8	3.5	81.4	61.5	70.8