Program to Develop High Strength Aluminum Powder Metallurgy Products. Phase 1. Process Optimization

AbstractBy the control of composition, clustered atomic configuration and stability of the supercooled liquid in the rapid solidification and powder metallurgy processes, high-strength Al-based bulk alloys containing nanoscale nonperiodic phases were produced in AI-Ln-LTM, AI-ETM-LTM and Al-(V, Cr, Mn)-LTM (Ln=lanthanide metal, LTM=VII and VIII group metals, ETM=IV to VI group metals) alloys containing high Al contents of 92 to 95 at%. The nonperiodic phases are composed of amorphous or icosahedral (I) phase. In particular, the Al-based bulk alloys consisting of nanoscale I particles surrounded by Al phase exhibit much better mechanical properties as compared with commercial Al base alloys. The success of producing the Al-based alloys with good engineering properties by use of I phase is important for future development of I-based alloys as practical materials.

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Binder jetting additive manufacturing of 316L stainless-steel green parts with high strength and low binder content: Binder preparation and process optimization

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2020.117020 ◽

2021 ◽

Vol 291 ◽

pp. 117020

Author(s):

Yiwei Mao ◽

Jingwen Li ◽

Wei Li ◽

Daosheng Cai ◽

Qingsong Wei

Keyword(s):

Stainless Steel ◽

Additive Manufacturing ◽

Process Optimization ◽

316L Stainless Steel ◽

High Strength ◽

Binder Content ◽

Binder Jetting

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Microstructure Evolution and Deformation Mechanisms of Harmonic Structure Designed Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.879.145 ◽

2016 ◽

Vol 879 ◽

pp. 145-150

Author(s):

Kei Ameyama ◽

Sanjay Kumar Vajpai ◽

Mie Ota

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Powder Metallurgy ◽

Early Stage ◽

High Strength ◽

Plastic Instability ◽

Structure Design ◽

Harmonic Structure ◽

Homogeneous Microstructure ◽

Macro Scale

This paper presents the novel microstructure design, called Harmonic Structure, which gives structural metallic materials outstanding mechanical properties through an innovative powder metallurgy process. Homogeneous and ultra-fine grain (UFG) structure enables the materials high strength. However, such a “Homo-“ and “UFG” microstructure does not, usually, satisfy the need to be both strong and ductile, due to the plastic instability in the early stage of the deformation. As opposed to such a “Homo-and UFG“ microstructure, “Harmonic Structure” has a heterogeneous microstructure consisting of bimodal grain size together with a controlled and specific topological distribution of fine and coarse grains. In other words, the harmonic structure is heterogeneous on micro-but homogeneous on macro-scales. In the present work, the harmonic structure design has been applied to pure metals and alloys via a powder metallurgy route consisting of controlled severe plastic deformation of the corresponding powders by mechanical milling or high pressure gas milling, and subsequent consolidation by SPS. At a macro-scale, the harmonic structure materials exhibited superior combination of strength and ductility as compared to their homogeneous microstructure counterparts. This behavior was essentially related to the ability of the harmonic structure to promote the uniform distribution of strain during plastic deformation, leading to improved mechanical properties by avoiding or delaying localized plastic instability.

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Welding Process Optimization of WELDOX960 High Strength Steel

MATEC Web of Conferences ◽

10.1051/matecconf/201820704005 ◽

2018 ◽

Vol 207 ◽

pp. 04005

Author(s):

Min Hu

Keyword(s):

Penetration Depth ◽

Process Optimization ◽

Process Parameters ◽

Welding Speed ◽

High Strength Steel ◽

Welding Process ◽

Welding Current ◽

High Strength ◽

Influence Of Process Parameters ◽

Steel Analysis

This paper studies WELDOX960 high strength steel, analysis of the welding ability of WELDOX960 high strength steel. Analyze the weld ability of WELDOX960 high-strength steel materials, and study the influence of process parameters such as welding current, welding voltage, and welding speed on penetration depth and weld width in the automated welding process. Through this test, the welding process is optimized to ensure the weld quality. The results show that WELDOX960 high-strength steel adopts multi-layer and multi-pass welding to form better welds.

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