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目前作为航空锻件用GC-4材料的冲击韧性α_k值一般在54J/cm~2左右,而合格模锻件要求在59J/cm~2以上。从生产质量统计分析,报废原因约有80％均系α_k值不合格。这不仅制约了工厂的生产,也给航天器材的可靠性带来严重影响。为此,由航空航天部提出并经国家计委批准,将“提高GC-4材料α_k值的研究”列入机电部国防军工配套科研项目,并明确提出了在保证综合性能合格基础上,α_k值目标值为64～69J/cm~2。
At present, the impact toughness (α_k) of GC-4 materials used for aviation forgings is generally about 54J / cm ~ 2, while the requirements for qualified die forging are above 59J / cm ~ 2. From the statistical analysis of production quality, about 80% of the scrapped causes are all unacceptable values of α_k. This not only restricts the production of the factory, but also has a serious impact on the reliability of aerospace equipment. To this end, proposed by the Aerospace Department and approved by the State Planning Commission, “will improve GC-4 material α_k value” included in the Department of Electrical and Mechanical Services Department of Defense supporting scientific research projects, and clearly proposed to ensure comprehensive performance based on the pass, α_k The target value is 64-69 J / cm ~ 2.