冷却速率导致的薄壁效应对<strong>K465</strong>合金显微组织和持久性能的影响

冷却速率导致的薄壁效应对K465合金显微组织和持久性能的影响

郭小童, 郑为为, 李龙飞, 冯强

Cooling Rate Driven Thin-Wall Effects on the Microstructures and Stress Rupture Properties of K465 Superalloy

GUO Xiaotong, ZHENG Weiwei, LI Longfei, FENG Qiang

表1 K465合金管材经标准热处理和900~1050 ℃热暴露后枝晶干γ'相的面积分数(A_f)和晶界γ'膜的宽度(W)

Table 1 The area fractions of γ' precipitates (A_f) in the dendrite core regions and the widths of γ' film (W) along the grain boundaries in the K465 alloy tube after the standard heat treatment and after thermal exposure at 900~1050 ℃

Exposure temperature ℃	Exposure time h	A_f %	W μm
As-received	-	63.2±2.2	3.4±0.7
900	300	66.1±1.7	3.9±0.9
	500	66.8±0.6	5.8±0.7
	1000	66.1±1.5	6.2±0.4
1000	300	64.4±1.6	6.4±0.2
	500	63.0±1.8	7.6±1.7
	1000	61.8±2.5	8.6±0.8
1050	300	52.2±1.1	6.9±1.1
	500	48.9±1.9	8.3±0.1
	1000	47.6±1.0	9.0±1.6