K 4169合金铸件的常温疲劳断裂行为

上海交通大学学报（自然版） ›› 2012, Vol. 46 ›› Issue (09): 1461-1465.

K 4169合金铸件的常温疲劳断裂行为

康茂东, 高海燕, 王俊, 凌李石保, 孙宝德

(上海交通大学金属基复合材料国家重点试验室，上海 200240)

收稿日期:2011-12-22 出版日期:2012-09-28 发布日期:2012-09-28

Fatigue Fracture Behavior of K4169 Alloy Casting at Room Temperature

KANG Mao-Dong, GAO Hai-Yan, WANG Jun, LING Li-Shi-Bao, SUN Bao-De

(State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China)

Received:2011-12-22 Online:2012-09-28 Published:2012-09-28

摘要/Abstract

摘要： 摘要：
通过在某K4169合金精密大型熔模铸件本体典型承力结构处取样而进行常温疲劳试验，并结合疲劳断口的分析与凝固过程的温度场模拟，对其疲劳断裂机制进行探讨.结果表明，不同结构试样的疲劳寿命差异显著，其疲劳失效与微观疏松缺陷及其分布有关.早期的疲劳失效试样中存在大量的疏松缺陷，而疲劳性能较好的试样的疏松缺陷很少.当疏松缺陷较少时，疲劳裂纹主要沿晶间Laves相和碳化物扩展；当疏松缺陷较多时，裂纹主要经疏松缺陷而加速扩展并导致试样的早期失效.
关键词：
K4169合金；疲劳断裂；疏松缺陷；模拟
中图分类号： TG 111.8
文献标志码： A

Abstract: The fatigue properties of the specimens cutting from the characteristic structure of the K4169 heavy investment casting were tested at room temperature. The mechanism of fatigue fracture was studied by combinational fracture analysis and temperature field simulation of solidification process. The results reveal that the structure of the casting has significant influence on the fatigue life. The fatigue failure of specimens is related to the content and distribution of the microporosity. A less microporosity leads to a well fatigue performance, and vice versa. The fatigue crack propagates along the interdentric Laves phase and carbide with low content of microporosity. However, the crack mainly accelerates through microporosity capturing with high content of microporosity, which leads to earlier failure of the specimen.

Key words: K4169 alloy, fatigue fracture, microporosity defect, simulation

康茂东, 高海燕, 王俊, 凌李石保, 孙宝德. K 4169合金铸件的常温疲劳断裂行为 [J]. 上海交通大学学报（自然版）, 2012, 46(09): 1461-1465.

KANG Mao-Dong, GAO Hai-Yan, WANG Jun, LING Li-Shi-Bao, SUN Bao-De. Fatigue Fracture Behavior of K4169 Alloy Casting at Room Temperature[J]. Journal of Shanghai Jiaotong University, 2012, 46(09): 1461-1465.

参考文献

［1］Prakash Leo D G, Walsh M J, Maclachlan D, et al.

Crack growth micromechanisms in the IN718 alloy

under the combined influence of fatigue, creep and oxidation ［J］. International Journal of Fatigue, 2009, 31 (1112):19661977.
［2］Kawagoishi N, Chen Q, Yan N, et al. Fracture mechanism in fatigue of Nickelbased superalloy inconel 718 at elevated temperatures ［J］. Journal of Solid Mechanics and Materials Engineering, 2007, 1 (6):734743.
［3］侯善芹，许金泉. 基于疲劳特征长度概念的一种新疲劳理论［J］. 上海交通大学学报, 2010, 44 (10):14441449.
HOU Shanqin, XU Jinquan. A new fatigue theory based on fatigue characteristic length［J］. Journal of Shanghai Jiaotong University, 2010, 44 (10): 14441449.
［4］Li P, Lee P D, Maijer D M, et al. Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy ［J］. Acta Materialia, 2009, 57 (12): 35393548.
［5］Ferrié E, Buffière J Y, Ludwig W, et al. Fatigue crack propagation: In situ visualization using Xray microtomography and 3D simulation using the extended finite element method ［J］. Acta Materialia, 2006, 54 (4): 11111122.
［6］肖骥，PESSARD E，王敏，等. 7475铝合金板材的各向异性疲劳性能［J］. 上海交通大学学报，2011, 45 (11)：16781683.
XIAO Ji, PESSARD E, WANG Min, et al. The research of anisotropic fatigue behavior of 7475 aluminum alloy plate ［J］. Journal of Shanghai Jiaotong University, 2011, 45 (11): 16781683.
［7］汤鑫，曹腊梅，盖其东，等. K4169合金整体导向环精铸技术及热处理工艺研究［J］. 宇航材料工艺, 2007 (6): 8286.
TANG Xin, CAO Lamei, GAI Qidong, et al. Investment casting technology and heat treatment process of K4169 superalloy integral nozzle ring ［J］. Aerospace Materials and Technology, 2007 (6)：8286.
［8］刘孝敏. 工程材料的微细观结构和力学性能［M］. 合肥：中国科学技术大学出版社，2003：161167.
［9］姚俊，郭建亭，袁超，等. 铸造镍基高温合金K52的低周疲劳行为［J］. 金属学报, 2005，41(4)：357362.
YAO Jun, GUO Jianting, YUAN Chao, et al. Low cycle fatigue behavior of cast nickel base superalloy K52［J］. Acta Metallurgica Sinica, 2005, 41 (4): 357362.