Complexing Agent on the Surface of Magnesium Alloy Plating of Ni-B Alloy

2011 ◽  
Vol 311-313 ◽  
pp. 327-330 ◽  
Author(s):  
Yu Cai ◽  
Zhen Zhen Chang ◽  
Chun Mei Chen ◽  
Yu Ting Bai ◽  
Ya Wei Lin ◽  
...  
Keyword(s):  
High Speed ◽  
Preparation Method ◽  
High Speed Steel ◽  
Alloy Element ◽  
Spray Forming ◽  
Complexing Agent ◽  
Regular Shape ◽  
Carbide Morphology ◽  
Carbide Particles ◽  
Deposition Substrate

CPM9V high speed steel(HSS) ring billet was prepared by spray forming(SF), the yield is 83.5%, porosity is 0.8%, spray forming preparation method and technological parameter were illustrated. The microstructure and carbide morphology on the different position of billet were observed. The results show that carbide particles have small size, regular shape and uniform distribution, alloy element without segregation. There are some pores and defects in the position of ring billet closed to deposition substrate, come from spray forming instability beginning stage.

Study on CPM9V High Speed Steel Ring Prepared by Spray Forming

2011 ◽  
Vol 311-313 ◽  
pp. 624-630
Author(s):  
Yi Xu ◽  
Chang Chun Ge
Keyword(s):  
High Speed ◽  
Technological Parameter ◽  
Preparation Method ◽  
High Speed Steel ◽  
Alloy Element ◽  
Spray Forming ◽  
Regular Shape ◽  
Carbide Morphology ◽  
Carbide Particles ◽  
Deposition Substrate

CPM9V high speed steel(HSS) ring billet was prepared by spray forming(SF), the yield is 83.5%, porosity is 0.8%, spray forming preparation method and technological parameter were illustrated. The microstructure and carbide morphology on the different position of billet were observed. The results show that carbide particles have small size, regular shape and uniform distribution, alloy element without segregation. There are some pores and defects in the position of ring billet closed to deposition substrate, come from spray forming instability beginning stage.

Spray forming high speed steel—properties and processing

2004 ◽  
Vol 383 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Rafael Agnelli Mesquita ◽  
Celso Antonio Barbosa
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Spray Forming ◽  
Steel Properties

Effect of niobium and austenitizing temperature on the microstructures and properties of spray-deposited AISI M3:2 high speed steel

2021 ◽  
Vol 119 (1) ◽  
pp. 102
Author(s):  
Hebin Wang ◽  
Da Hong ◽  
Longgang Hou ◽  
Li Shen ◽  
Ping Ou ◽  
...  
Keyword(s):  
High Temperature ◽  
Grain Boundaries ◽  
High Speed ◽  
High Speed Steel ◽  
High Hardness ◽  
Spray Forming ◽  
Precipitation Strengthening ◽  
Austenitizing Temperature ◽  
The Matrix ◽  
Red Hardness

The microstructure and properties of niobium-containing AISI M3:2 high speed steels (HSSs) fabricated by spray forming and traditional casting have been investigated. The results show that fine and uniformly-distributed grains without macrosegregation appeared in the as-deposited HSSs that differ from those of as-cast HSSs. Nb mostly appears in primary MC carbides, whereas it contributes less to the formation of M6C carbides. The high stabilization of Nb-rich MC carbides can pin the grain boundaries during high-temperature austenitizing process, thus conferring a fine grains and raising the content of dissolved alloying elements. Enhanced precipitation strengthening and fine dispersion of NbC carbides throughout the matrix contribute to the high hardness and red hardness of Nb-containing HSS.

An Overview of the Microstructures Present in High-Speed Steel -Carbides Crystallography

2006 ◽  
Vol 530-531 ◽  
pp. 48-52 ◽  
Author(s):  
M.M. Serna ◽  
Edilson Rosa Barbarosa Jesus ◽  
E. Galego ◽  
Luís Gallego Martinez ◽  
H.P.S. Corrêa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
First Principles ◽  
High Speed ◽  
High Speed Steel ◽  
High Hardness ◽  
Spray Forming ◽  
Steel Matrix ◽  
X Ray Diffraction ◽  
X Ray

The aim of the work was to prepare an overview about the microstructures present in high-speed steel, focused on the crystallography of the carbides. High-speed steels are currently obtained by casting, powder metallurgy and more recently spray forming. High-speed steels have a high hardness resulting from a microstructure, which consists of a steel matrix (martensite and ferrite), in which embedded carbides of different crystal structure, chemical composition, morphology and size, exist. These carbides are commonly named MxC, where M represents one or more metallic atoms. These carbides can be identified by X-ray diffraction considering M as a unique metallic atom. In this work, it is discussed, in basis of the first principles of physics crystallography, the validation of this identification when it is considered that other atoms in the structure are substitutional. Further, it is discussed some requirements for data acquisition that allows the Rietveld refinement to be applied on carbide crystallography and phase amount determination.

Improved the microstructures and properties of M3:2 high-speed steel by spray forming and niobium alloying

2016 ◽  
Vol 117 ◽  
pp. 1-8 ◽  
Author(s):  
L. Lu ◽  
L.G. Hou ◽  
J.X. Zhang ◽  
H.B. Wang ◽  
H. Cui ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Spray Forming

Preparation and Characterization of Spray Formed 2060 High Speed Steel

2016 ◽  
Vol 850 ◽  
pp. 603-609 ◽  
Author(s):  
Xin Lei Ni ◽  
Zhou Li ◽  
Hua Yuan ◽  
Wen Yong Xu ◽  
Guo Qing Zhang
Keyword(s):  
High Speed ◽  
Hot Forging ◽  
High Speed Steel ◽  
Subsequent Development ◽  
Spray Forming ◽  
Peak Hardness ◽  
Forming Process ◽  
Tempering Temperature ◽  
Equiaxed Grains ◽  
Microstructure Refining

Spray forming has attracted considerable attention for the production of high speed steels due to its potential and priority in the microstructure refining and cost saving. In this study, high-quality large billets of 2060 high speed steel were successfully produced by spray forming process using a twin-atomizer facility. As-deposited billet was subsequently processed by hot forging, quenching in oil at 1180 °C and a triple tempering in the temperature range of 500-580 °C. The microstructures and hardness of the deposit and their subsequent development resulting from hot forging and heat treatment were investigated. This paper was designed to provide insight and have a better understanding of such a system for the steel. The results showed that the as-deposited microstructure was composed of the fine equiaxed grains with V-rich MC and W-Mo-rich M2C carbides non-uniformly distributed along the grain boundaries and inside the grains. M2C presented rod-like or unconnected net-shaped morphologies in the as-deposited microstructure. Following hot forging, metastable M2C carbides were completely decomposed into refined MC and M6C nearly spherical carbides uniformly distributed throughout the microstructure. A hardness value of 31HRC was attained for the spray deposited and hot forged samples. With increasing the tempering temperature, hardness was increased firstly and then decreased. Secondary hardening peak appeared at 540 °C for spray formed 2060 steel austenitized at 1180 °C, and the corresponding peak hardness reached 71HRC.

DYNAVAN

Alloy Digest ◽  
1986 ◽  
Vol 35 (4) ◽  
Keyword(s):  
High Speed ◽  
Single Point ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Heat Treating ◽  
Vanadium Carbides ◽  
Blade Cutting ◽  
Machining Operations ◽  
Carbide Particles ◽  
Cobalt Addition

Abstract DYNAVAN is a super high-speed steel containing a high percentage of both carbon and vanadium to produce an abundance of wear-resisting vanadium carbide particles. These vanadium carbides impart increased abrasion-resisting qualities to hardened tools and the cobalt addition improves the hot-hardness characteristics. DYNAVAN is somewhat difficult to work and to grind. As a result, it is used primarily for single-point or inserted-blade cutting tools for those limited machining operations demanding properties superior to the standard high-speed grades. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-456. Producer or source: Latrobe Steel Company.

Performance Assessment of Spray Formed AISI M2 High-Speed Steel Tools

2006 ◽  
Vol 530-531 ◽  
pp. 315-320
Author(s):  
Edilson Rosa Barbarosa Jesus ◽  
E.S. Jesus Filho ◽  
J.L. Rossi
Keyword(s):  
Powder Metallurgy ◽  
Performance Assessment ◽  
Hot Rolling ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
Spray Forming ◽  
Process Conditions ◽  
Machining Performance ◽  
M2 High Speed Steel

Machining tools (interchangeable inserts) were manufactured from spray formed AISI M2 high-speed steel. The spray formed materials were mechanical and microstructural characterised. An assessment of the machining performance of the spray formed high-speed steel was attained. These results were compared to materials obtained by conventional and powder metallurgy techniques. The results showed that under the used process conditions (hot rolling and heat treating), the spray formed material showed a machining behaviour near closed to other materials; and highlight the potential of the spray forming technique for the obtention of materials with adequate properties for machining tools manufacturing.

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