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Effect of Thermomechanical Processin...

Cardoso, Rogerio Antao,

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Effect of Thermomechanical Processing and Heat Treatment on the Microstructure and Mechanical Properties of Ultra-High Strength Steels /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effect of Thermomechanical Processing and Heat Treatment on the Microstructure and Mechanical Properties of Ultra-High Strength Steels // Rogerio Antao Cardoso.
作者:	Cardoso, Rogerio Antao,
面頁冊數:	1 electronic resource (149 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-08, Section: B.
Contained By:	Dissertations Abstracts International86-08B.
標題:	Materials science. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31557452
ISBN:	9798302883858

Effect of Thermomechanical Processing and Heat Treatment on the Microstructure and Mechanical Properties of Ultra-High Strength Steels /
Cardoso, Rogerio Antao,

Effect of Thermomechanical Processing and Heat Treatment on the Microstructure and Mechanical Properties of Ultra-High Strength Steels /Rogerio Antao Cardoso. - 1 electronic resource (149 pages)

Source: Dissertations Abstracts International, Volume: 86-08, Section: B.

A martensite-based and an austenite-based Fe-Mn-Al steels were investigated aiming the pilot-scale production of steels that meet military specifications for Rolled Homogeneous Armor (RHA) and High-hardness Armor (HHA) plates. Each material underwent specific thermomechanical processes and the following hardness, Charpy V-notch (CVN) impact toughness at -40 °C and room-temperature tensile properties were correlated with the resulting microstructures.Specimens of the martensitic steel were austenitized at 1010 °C, quenched and tempered at 150, 175, 200, 225 and 250 °C for times up to four hours. As for the Fe-Mn-Al steel, its hot rolling schedule was design to promote strain accumulation in the as-rolled matrix, which is conducive to the precipitation of NiAl during annealing heat treatments. Specimens of this steel were annealed at 700, 750, 800 and 900 °C for times up to one hour.The results show evidence of tempered martensite embrittlement (TME) in the martensite-based steel, especially when tempered for four hours at the investigated temperature range.Regarding the Fe-Mn-Al steel, electron backscattered analyses (EBSD) revealed strain accumulation in the as-rolled austenitic matrix. Annealing at 750 °C for 30 min. strengthened the steel through intra-granular precipitation of NiAl. It was followed by a drop in the CVN impact toughness. Nevertheless, literature review showed that the investigated material outperformed similar austenite-based Fe-Mn-Al steels strengthened through k-carbide.

English

ISBN: 9798302883858Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

Martensite

Effect of Thermomechanical Processing and Heat Treatment on the Microstructure and Mechanical Properties of Ultra-High Strength Steels /
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520 $a A martensite-based and an austenite-based Fe-Mn-Al steels were investigated aiming the pilot-scale production of steels that meet military specifications for Rolled Homogeneous Armor (RHA) and High-hardness Armor (HHA) plates. Each material underwent specific thermomechanical processes and the following hardness, Charpy V-notch (CVN) impact toughness at -40 °C and room-temperature tensile properties were correlated with the resulting microstructures.Specimens of the martensitic steel were austenitized at 1010 °C, quenched and tempered at 150, 175, 200, 225 and 250 °C for times up to four hours. As for the Fe-Mn-Al steel, its hot rolling schedule was design to promote strain accumulation in the as-rolled matrix, which is conducive to the precipitation of NiAl during annealing heat treatments. Specimens of this steel were annealed at 700, 750, 800 and 900 °C for times up to one hour.The results show evidence of tempered martensite embrittlement (TME) in the martensite-based steel, especially when tempered for four hours at the investigated temperature range.Regarding the Fe-Mn-Al steel, electron backscattered analyses (EBSD) revealed strain accumulation in the as-rolled austenitic matrix. Annealing at 750 °C for 30 min. strengthened the steel through intra-granular precipitation of NiAl. It was followed by a drop in the CVN impact toughness. Nevertheless, literature review showed that the investigated material outperformed similar austenite-based Fe-Mn-Al steels strengthened through k-carbide.
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650 4 $a Physical chemistry. $3 1981412
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653 $a Nial
653 $a Strain accumulation
653 $a Tempered martensite embrittlement
653 $a Tempering
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690 $a 0494
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