23Co14Ni12Cr3MoE超高强度钢中痕量元素P分析方法

 随飞机性能的不断提高，对制造关键承力件所用的高强度钢提出了更高的要求，向着超高强、高韧性和耐蚀的方向发展，相继蕴育而生了Co-Ni超高强度钢Hy-180、AF1410和AerMet100。AerMet100（23Co14Ni12Cr3MoE）具有优良的综合性能，使用强度达到1965MPa，断裂韧性不低于110MPa·m1/2。同时还具有良好的抗疲劳、抗应力腐蚀性能。为保证合金的综合性能，对合金中的杂质元素的含量要求严格，特别是痕量元素P要求达到双零级（P≤0.001%）。本文通过对目前国内外对合金中痕量元素P分析的主要分析标准比较，结合23Co14Ni12Cr3MoE超高强度钢不含W、Nb、Ta、V、Ti、Zr、As等干扰元素的特点，制定了以乙酸丁酯萃取磷钼蓝光度法进行分析，不经沉淀分离，一步萃取的简便测试方法，测定痕量元素P下限为0.001%，相对标准偏差RSD小于30%。

Determination of Trace Element Phosphorus in 23C014Ni12Cr3MoE Ultrahigh Strength Steel

To improve the performance of military aircraft, special steels are required in the critical components, with ultrahigh strength, high toughness and improved resistance to stress-corrosion cracking. The past several decades saw an extensive interest in the structure and mechanical properties of cobalt-nickel secondary hardening ultrahigh strength steels, which led to the successful development of Hy180, AF1410, AerMet100. AerMet100(23Co14Ni12Cr3MoE) is a super strength steel with high contents of cobalt and nickel with a typical ultimate tensile strength (UTS) of 1965MPa. The contents of impurity elements in this alloy are less than a tenth percent. In this article, a method for the determination of trace amounts of phosphorus (P) is described. The trace P is determinated by "butyl acetate extraction spectrometric method", which is a method without separation, of one step extraction, with good accuracy and precision, and with detection limit of 0.001%, RSD<30%. The method has been applied to the determination of P in 23Co14Ni12Cr3MoE steel with satisfactory results.