K4169高温合金铸件铸造缺陷修复及疲劳性能研究

doi:10.11896/cldb.20090159

材料导报

2021, Vol. 35

Issue (22): 22115-22120 https://doi.org/10.11896/cldb.20090159

金属与金属基复合材料

K4169高温合金铸件铸造缺陷修复及疲劳性能研究

许章华¹, 谢志雄¹, 康茂东², 王俊², 董仕节^1,3, 彭志贤⁴, 刘静⁴

1 湖北工业大学绿色轻工材料湖北省重点实验室,武汉 430070
2 上海交通大学上海市先进高温材料及其精密成形重点实验室,上海 200240
3 武汉轻工大学,武汉 430023
4 武汉科技大学耐火材料与冶金国家重点实验室,武汉 430081

Study of Casting Defect Repair and Fatigue Performance of K4169 Superalloy Casting

XU Zhanghua¹, XIE Zhixiong¹, KANG Maodong², WANG Jun², DONG Shijie^1,3, PENG Zhixian⁴, LIU Jing⁴

1 Hubei Provincial Key Laboratory of Green Light Industrial Materials, Hubei University of Technology, Wuhan 430070, China
2 Shanghai Key Laboratory of Advances High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
3 Wuhan Polytechnic University, Wuhan 430023,China
4 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要采用TIG焊对K4169高温合金薄片中铸造组织缺陷进行修复,并对修复前后的合金薄片进行疲劳性能测试和显微组织分析。结果表明:铸造缺陷对合金薄片疲劳性能的影响很大,含铸造缺陷的合金薄片疲劳寿命不到3万周次,而不含铸造缺陷的合金薄片疲劳寿命达7.1万周次。含铸造缺陷的样品经过TIG焊接修复后,疲劳寿命仍达6~9万周次,接近甚至超过了不含缺陷的试样疲劳寿命,这表明合适的焊接修复方法不会降低高温合金薄片的疲劳性能。铸件焊接修复后疲劳寿命高的原因是,焊缝中析出的较粗大相数量多、分布均匀,且疲劳裂纹扩展过程中产生较多的二次裂纹引发了裂纹偏移和扩展路径增长。

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	刘静

关键词: K4169高温合金焊接修复疲劳寿命二次裂纹

Abstract: TIG welding method was used to repair the defects of the cast structure in the K4169 superalloy plates, and the fatigue performance test and microstructure analysis of the alloy plates before and after repair were performed. The results show that casting defects have a great in-fluence on the fatigue performance of alloy plates. The fatigue life of alloy plate with casting defects is less than 30 000 cycles, while the fatigue life of alloy plate without free casting defects reaches 71 000 cycles. After TIG welding repair of the defective specimens, the fatigue life of the specimen reaches 60 000 to 90 000 cycles, which is close to or even exceeding the fatigue life of the samples without defects. This shows that suitable welding repair method will not reduce the fatigue performance of K4169 superalloy. The reason for the high fatigue life of castings after welding repair is that the number of coarser phases precipitated in the weld is large and evenly distributed, and more secondary cracks are gene-rated during the fatigue crack propagation process, which leads to crack offset and growth path growth.

Key words: K4169 superalloy welding repair fatigue life secondary cracks

出版日期: 2021-11-25 发布日期: 2021-12-13

ZTFLH:

TB31

基金资助: 国家自然科学基金项目(51971142);航空科学基金项目(2018ZE57012)

通讯作者: xzx@hbut.edu.cn

作者简介: 许章华,2018年6月毕业于湖北工业大学,获得工学学士学位。现为湖北工业大学材料与化学工程学院硕士研究生,在谢志雄老师的指导下进行研究。目前的主要研究领域为焊接修复高温合金的疲劳性能、深冷处理对不锈钢焊接接头影响的研究。
谢志雄,工学博士,硕士研究生导师,湖北工业大学材料成型及控制工程系副主任,2012 年6 月于上海交通大学材料加工工程专业获工学博士学位,迄今发表论文20 余篇,其中SCI/EI 收录论文15 余篇,主持和参与湖北省自然科学基金项目、国家自然科学基金项目,获湖北省科技进步奖三等奖和湖北省自然科学三等奖各1 项,主要从事高强高导铜合金的制备、组织、性能和强化机理,产氢铝合金的制备,产氢机理方面,超薄壁钛管、不锈钢管高频焊接研究.

引用本文:

许章华, 谢志雄, 康茂东, 王俊, 董仕节, 彭志贤, 刘静. K4169高温合金铸件铸造缺陷修复及疲劳性能研究[J]. 材料导报, 2021, 35(22): 22115-22120.
XU Zhanghua, XIE Zhixiong, KANG Maodong, WANG Jun, DONG Shijie, PENG Zhixian, LIU Jing. Study of Casting Defect Repair and Fatigue Performance of K4169 Superalloy Casting. Materials Reports, 2021, 35(22): 22115-22120.

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http://www.mater-rep.com/CN/10.11896/cldb.20090159 或 http://www.mater-rep.com/CN/Y2021/V35/I22/22115

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