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粉末高温合金中夹杂物的变形特征及对 探伤信号的影响
Deformation Characteristics of Inclusions in Powder Metallurgy Superalloy and Effects on Flaw Detection Signals
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- DOI:
- 作者:
- 周晓明，王志彪，王超渊，权 鹏，曾维虎，冯业飞
ZHOU Xiaoming, WANG Zhibiao, WANG Chaoyuan, QUAN Peng, ZENG Weihu, FENG Yefei
- 作者单位:
- 中国航发北京航空材料研究院 先进高温结构材料重点实验室，北京 100095
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
- 关键词:
- 粉末高温合金；非金属陶瓷夹杂物；变形特征；探伤信号
powder metallurgy superalloy; non-metallic inclusions; deformation characteristics; ultrasonic signals
- 摘要:
- 通过人工植入 Al2O3 颗粒的方法，研究了粉末高温合金中化学性质稳定型陶瓷夹杂物随样品制备工艺过程
其形状和尺寸的遗传特征，及对探伤信号识别的影响规律。 结果表明，Al2O3 颗粒经热等静压致密化后，其形状和尺寸未
发生变化，与基体之间为机械结合，无反应过渡区；经热挤压变形后，Al2O3 颗粒被破碎，并沿挤压变形方向呈“链状”分
布，“链状”夹杂物的长度扩大至原始尺寸的约 2～5 倍；经等温锻造后，“链状”夹杂物内细颗粒的二次破碎效果不显著，
随基体合金流动而发生倾转并被分散。 上述夹杂物的变形特征表明，在某一中等变形量范围内的夹杂物颗粒更易被探
伤信号识别，实际锻件探伤信号的分布特征证实了本试验结果的合理性。
The genetic characteristics of the shape and size of chemically stable ceramic inclusions in powdered superalloy were studied by artificial implantation of Al2O3 particles during sample preparation process, and the influence of ceramic inclusions on the identification of flaw detection signals was studied. The results show that the shape and size of Al2O3 particles do not change after hot isostatic pressing densification, and there is no reaction transition zone between Al2O3 particles and matrix. After hot extrusion deformation, Al2O3 particles are broken and distributed in a ‘chain-like’ distribution along the extrusion deformation direction, and the length of the ‘chain-like’ inclusions increases to about 2 to 5 times of the original size. After isothermal forging, the secondary crushing effect of the fine particles in the ‘chain’ inclusions is not significant, and they are inclined and dispersed with the flow of the matrix alloy. The deformation characteristics of the inclusion above indicate that the inclusion particles within a moderate deformation range are easier to be recognized by the flaw detection signal. The distribution characteristics of the flaw detection signal of the actual forging confirm the rationality of the test results.