2024 Powder Metallurgy World Congress & Exhibition

Presentation information

General Sessions (Oral) » T2 Compaction & Sintering

[T2] Compaction & Sintering

Oral

Mon. Oct 14, 2024 3:50 PM - 4:50 PM Room A (3F 301, Conference Center)

Chairpersons: Hironori Suzuki (Kobe Seel, Ltd., Japan), Yukinori Taniguchi (National Institute of Technology, Nara College, Japan)

4:10 PM - 4:30 PM

[14A-T2-07] Various Properties of High-Density Sintered Stainless Steel Obtained by Powder Compacting

*K. Shimauchi1, Y. Mizuta1, T. Tashiro2, S. Egashira2, T. Ishimine2 (1.Sumitomo Electric Sintered Alloy, Ltd., Japan, 2.Sumitomo Electric industries,Ltd., Japan)

Keywords: Stainless Steel, Hight density, Green machining, Small diameter holes.

Stainless steel is used in a wide range of applications due to excellent mechanical properties and corrosion resistance. However, there is a difficulty in forming unmachinable small diameter and deep holes since stainless steel is a difficult-to-cut material. Additionally, the application of sintered stainless steel is limited to items that do not require airtightness due to the presence of pores inside the material. Although a method of increasing the density using liquid phase sintering was considered to reduce internal pores of sintered stainless steel, it significantly affects dimensional accuracy and post-processing after sintering because of the generation of large amount of shrinkage. In order to solve the above issues, we developed a high-density green machining method that combines a technique to increase density during powder compaction and a green machining process. We successfully manufactured a sintered stainless steel material with a density of 95 vol% and no-leakage even under 70Mpa hydrogen.