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本文从实验和理论方面,研究了液相烧结W—Ni—Cu重合金的大气应力腐蚀,分析了应力腐蚀开裂行为,提出了合金大气应力腐蚀的电化学模型以及应力腐蚀的微观机理。实验表明,合金发生大气应内腐蚀开裂,与合金的材料因素、应力因素和环境因素有关,合金中裂纹尖端的H~+的浓度、Cl~-的浓度、Cu—Ni固溶体中镍、钨的偏析程度以及残留应力的状态等,是影响合金应力腐蚀开裂的重要因素。实验还表明,减少和避免环境因素的影响,细化合金中的钨晶粒度,是提高合金抗应力腐蚀开裂能力的有效途径。
In this paper, the atmospheric stress corrosion of liquid-phase sintered W-Ni-Cu heavy alloy was studied experimentally and theoretically. The stress corrosion cracking behavior was analyzed. The electrochemical model of stress corrosion of alloy was proposed and the microscopic mechanism of stress corrosion was proposed. Experiments show that the atmosphere of the alloy should be internally corrosion cracking, and the alloy material factors, stress factors and environmental factors related to the alloy crack tip H ~ + concentration, Cl ~ - concentration, Cu-Ni solid solution of nickel, tungsten The degree of segregation and the state of residual stress are important factors affecting the stress corrosion cracking of the alloy. Experiments also show that reducing and avoiding the influence of environmental factors and refining the grain size of tungsten alloy is an effective way to improve the ability of the alloy to resist stress corrosion cracking.