The Development of a High Speed Steel Based Sintered Material for High Performance Exhaust Valve Seat Inserts

1998 ◽  
Author(s):  
Hideaki Kawata ◽  
Koichiro Hayashi ◽  
Kei Ishii ◽  
Kunio Maki ◽  
Atsushi Ehira ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
Sintered Material ◽  
High Speed Steel ◽  
Exhaust Valve ◽  
Valve Seat ◽  
Valve Seat Inserts

Sintered Valve Seat Inserts – Microstructural Characterisation

2006 ◽  
Vol 530-531 ◽  
pp. 65-70 ◽  
Author(s):  
E.S. Jesus Filho ◽  
Edilson Rosa Barbarosa Jesus ◽  
Lucio Salgado ◽  
S.L. Jesus ◽  
Marco Antonio Colosio ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
Diffusion Mechanism ◽  
High Speed Steel ◽  
Heat Treatment Condition ◽  
Commercial Application ◽  
Valve Seat ◽  
Before And After ◽  
The Matrix ◽  
Valve Seat Inserts

This work presents aspects related to new sintered materials for valve seat inserts application. Two types of materials were evaluated. The materials were made using powder metallurgy technique from a basic mixture of high-speed steel (AISI M3/2), iron and carbide powders. The microstructures of these materials before and after heat treatment are presented. Under the heat treatment condition, the activation of the diffusion mechanism among phases was promoted and a better distribution of the Cu phases along the matrix was achieved. The results indicate that the materials under development have a potential for commercial application as valve seat inserts.

Machining and Mechanical Characterisation of PM Materials for Valve Seat Inserts

2005 ◽  
Vol 498-499 ◽  
pp. 79-85 ◽  
Author(s):  
E.S. Jesus Filho ◽  
Lucio Salgado ◽  
S.L. de Jesus ◽  
J.L. Rossi ◽  
Marco Antonio Colosio ◽  
...  
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
High Speed Steel ◽  
Hard Metal ◽  
Commercial Application ◽  
Valve Seat ◽  
Mechanical Characterisation ◽  
New Development ◽  
Valve Seat Inserts ◽  
Seat Insert

This article shows some fabrication aspects related to the obtention of sintered valve seat insert. This insert was made of a mixture of high-speed steel powders and iron powders plus NbC. This is a new development aiming the substitution of Co alloys currently used for valve seat inserts. The physical properties, mechanical properties and machining behaviour are discussed. The machining characteristics in terms of tool wear, cutting forces and chips morphology of the insert was compared to available commercial insert. The machining results indicate that the material under development has potential for commercial application and shows good machining evidences, in terms of equivalent cutting forces for ceramic tool. In addition, the machining using hard metal tool was susceptible to hardness variation observed for the material under development. Therefore, the machining tests point out the necessity for a microstructure homogenisation of the obtained material.

scholarly journals High Performance Valve Seat Materials for CNG Powered Combustion Engines

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4860
Author(s):  
Andrzej Romański ◽  
Elżbieta Cygan-Bączek
Keyword(s):  
High Speed ◽  
High Performance ◽  
Base Material ◽  
High Speed Steel ◽  
Wear Test ◽  
Gas Temperature ◽  
Valve Seat ◽  
Test Procedures ◽  
Gasoline Engines ◽  
Engine Valves

The conventional copper infiltrated high speed steel (HSS) valve seats used in gasoline engines are not suitable for CNG combustion because the exhaust gas temperature is at least 80 °C higher, which drastically shortens the service life of the engine valves. Therefore, a proprietary high-alloy HSS-base material was designed to combat hot corrosion and mechanical wear of valve seat faces in CNG fuelled engines. A batch of −100 mesh water atomized HSS powder was commissioned. The powder was vacuum annealed in order to reduce oxygen content and increase its compressibility. To improve the final part machinability, 1.2% MnS was admixed to the HSS powder prior to compaction. The green compacts were sintered at 1135 °C in nitrogen to around 83% TD and subsequently infiltrated with a copper alloy. After installing the valve seat components on a cylinder head, the engine was tested for 100 h according to the automotive industry valve seat wear test procedures. Both the periodic 8-h checks as well as the final examination of the valve seats showed very slow wear, indicating their suitability for CNG powered engines.

scholarly journals Influence of air quenching on apparent hardness of valve seat inserts obtained with AISI M2 high-speed steel powder

2017 ◽  
Author(s):  
M. P. Gomes ◽  
I. P. Santos ◽  
L. A. M. Reis ◽  
F. C. Cione ◽  
M. A Colosio ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Steel Powder ◽  
Valve Seat ◽  
M2 High Speed Steel ◽  
Valve Seat Inserts

Mechanical and Microstructural Characterisation of P/M High-Speed Steel Valve Seat Inserts

2003 ◽  
Vol 416-418 ◽  
pp. 312-316 ◽  
Author(s):  
Lucio Salgado ◽  
E.S. Jesus Filho ◽  
Edilson Rosa Barbarosa Jesus ◽  
Francisco Ambrozio Filho ◽  
J.L. Rossi ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Valve Seat ◽  
Microstructural Characterisation ◽  
Valve Seat Inserts

scholarly journals Direct fabrication of high-performance high speed steel products enhanced by LaB 6

2016 ◽  
Vol 112 ◽  
pp. 469-478 ◽  
Author(s):  
Zhang Qiankun ◽  
Jiang Yao ◽  
Shen Weijun ◽  
Zhang Huibin ◽  
He Yuehui ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Speed Steel ◽  
Direct Fabrication

Sintering M3/2 High Speed Steel Powder by DMLS Process

2006 ◽  
Vol 514-516 ◽  
pp. 1506-1510
Author(s):  
Isabel M. Martins ◽  
Luis Esperto ◽  
Mário J.G. Santos
Keyword(s):  
High Speed ◽  
Sintered Material ◽  
High Speed Steel ◽  
Steel Powder ◽  
Layer Growth ◽  
Layer By Layer ◽  
Metal Powders ◽  
Consolidation Process ◽  
Small Areas ◽  
Scan Speed

The Direct Metal Laser Sintering (DMLS) technology uses a mixture of metal powders with different melting points to build objects layer by layer, directly from the geometric digitalised information. This process allows the manufacturing of prototype and production tools. In this study, the M3/2 high speed steel powder blended with 20 wt.% Cu3P and 0.25 wt.% graphite was laser-sintered, using two scan speeds (100 and 200 mm/s), keeping constant both hatching (0.30mm between two consecutive lines) and laser power (180W). The powder was spread in uniform layers of about 20m over a steel plate (100x60x6mm). The laser beam scanned small areas (12x15mm) in a single direction (OX). The surface morphology of the laser-sintered material shows that all material melted, but for 200mm/s scan speed, strings are well defined. This is probably due to a lower level of energy supplied to the material. The microstructure of the sintered material was studied in the longitudinal and transverse sections, to evaluate the consolidation process and layer growth. The material showed porosity and cracks formed during the process.

scholarly journals High Performance Gear Hobbing with powder-metallurgical High-Speed-Steel

Procedia CIRP ◽  
2012 ◽  
Vol 1 ◽  
pp. 196-201 ◽  
Author(s):  
Bernhard Karpuschewski ◽  
Hans-Joachim Knoche ◽  
Martin Hipke ◽  
Martin Beutner
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Speed Steel ◽  
Gear Hobbing
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