Development of Ultra Fine Grain Steel for Carburizing "ATOM Steel".

Kurebayashi, Yutaka; Nakamura, Sadayuki

doi:10.4262/denkiseiko.65.67

DENKI-SEIKO

1994

DOI: 10.4262/denkiseiko.65.67

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Development of Ultra Fine Grain Steel for Carburizing "ATOM Steel".

Yutaka Kurebayashi¹,

Sadayuki Nakamura²

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Cited by 5 publications

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“…Figure 6 summarises the interrelationship between niobium addition , reduced grain size and resulting fatigue limit. A grain size reduction from 25 um to 15 urncaused by niobium addition of about 0.025% -will result in an increase of fatigue limit of about 75 MPa [22]. Figure 4 [6].…”

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confidence: 99%

Niobium in Engineering Steels for Automotive Applications

Klinkenberg¹,

Trute

Bleck

2006

steel research international

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In the last decade, the European niobium consumption in automotive strip and sheet has more than tripled. The development of high strength and advanced high strength steel grades for strip and plate products focused upon constantly increasing strength levels combined with excellent fatigue properties as well as formability and weldability. Until now, the high potential of microalloyed steel has not been used to the same extent in forgings and springs. This paper reviews automotive components as transmissions, suspensions and springs highlighting new material solutions for special steels having optimized processing and in-use properties. Special consideration is given to the metallurgical background as well as to examples for the processing and application of niobium microalloyed steel in forgings and springs from low carbon and higher carbon containing steels. Niobium metallurgy permits the reduction of carbon to meet more stringent end-user requirements demanding high strength combined with improved toughness, fatigue strength and weldability at a competitive manufacturing cost.

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mentioning

confidence: 99%

Niobium in Engineering Steels for Automotive Applications

Klinkenberg¹,

Trute

Bleck

2006

steel research international

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Effects of Fine Precipitates on Austenite Grain Refinement of Micro-alloyed Steel during Cyclic Heat Treatment

et al. 2019

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Formation of Fine and Coarse Grain Layer by Atmosphere Control in Case Hardening*

Ando

Inoue

2015

HTM Journal of Heat Treatment and Materials

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Grain coarsening can cause decrease of the fatigue strength of carburized steel components. This artefact is considered to derive from a change in crack-initiation behaviour at the surface. However, grain coarsening can increase the hardenability of steel and thereby avoid the addition of alloying elements bringing about such hardenability. Thus, it is expected that steel with a dual-layer structure of a fine grain layer at the surface and a coarse grain layer in the inside achieves good fatigue strength and high hardenability while saving alloy elements. In this study, low pressure carburizing of JIS SCR420-Low N steels were carried out at 1323 K, both with and without the use of NH3 gas as a source of N to precipitate AlN. After carburizing without NH3 gas, only coarse grains were observed from the surface to the inside of the specimens. In contrast, after carburizing with NH3 gas, a dual layer structure with only fine grains at the surface and only coarse grains at the inside was observed. These results show that a dual-layer structure can be successfully obtained through the control of the AlN precipitation behavior by optimizing NH3 gas conditions during low pressure carburizing.

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Development of Ultra Fine Grain Steel for Carburizing "ATOM Steel".

Cited by 5 publications

References 0 publications

Niobium in Engineering Steels for Automotive Applications

Niobium in Engineering Steels for Automotive Applications

Effects of Fine Precipitates on Austenite Grain Refinement of Micro-alloyed Steel during Cyclic Heat Treatment

Formation of Fine and Coarse Grain Layer by Atmosphere Control in Case Hardening*

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