The Effect of Co and Mo Content on the Mechanical Properties of Metal Injection Molding High Alloy Ultra High Strength Steel
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摘要: 在工程结构材料领域，超高强度钢（UHSS）因其卓越的力学性能而备受瞩目。本文以传统马氏体时效钢为基础，通过增加Co和Mo元素含量，设计了一种新型超高强度钢粉末成分（Fe-18Co-15Ni-8Mo-3Cr-0.5Cu-0.4Nb-0.4V-0.2Al）。采用水气联合雾化法制备粉末，经混炼、注射成形、脱脂、烧结及热处理等金属注射成形（MIM）工艺，制备出超高强度钢试样。利用多种测试手段对粉末和试样进行表征与测试，结果表明粉末球形度高，烧结试样致密度达98.7%，力学性能优异（屈服强度1824 MPa，抗拉强度2053 MPa，延伸率7.9%）。本研究为MIM制备超高强度钢提供了理论与实验依据，有望推动其在3C产品等领域的应用。Abstract: In the field of engineering structural materials, ultra-high strength steel (UHSS) has attracted significant attention due to its excellent mechanical properties. Based on traditional maraging steel, this paper increases the content of Co and Mo elements in the powder composition design. The alloy composition of the powder is designed as Fe-18Co-15Ni-8Mo-3Cr-0.5Cu-0.4Nb-0.4V-0.2Al. The ultra-high strength steel powder is prepared using a water-gas combined atomization method. After processes such as mixing with a binder, injection molding, debinding, sintering, and heat treatment in the metal injection molding (MIM) process, the ultra-high strength steel specimen is obtained. The powder and specimen are characterized and tested using various testing methods. The results show that the powder exhibits high sphericity, the sintered specimen has a density of 98.7%, and the mechanical properties are excellent (yield strength of 1824 MPa, tensile strength of 2053 MPa, and elongation of 7.9%). This study provides theoretical and experimental foundations for the preparation of ultra-high strength steel by MIM and is expected to promote its application in fields such as 3C products.
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