10.38: Effects of heat-treatment methods on mechanical performance of high-tensile strength steel subject to elevated temperatures

Recent investigations revealed major fluctuations in the material properties of selective laser melted AlSi10Mg, which corresponded with the varying precipitation-hardening state of the microstructure, caused by the differing dwell times at elevated temperatures. It was indicated that a subsequent heat treatment balances the age-hardening and results in a homogenized material strength. In order to further investigate this statement selective laser melted AlSi10Mg samples were subject to multiple post-heat-treatments. Subsequently, the surface hardness and tensile strength was determined and compared with the as-built results. The post-heat-treatment led to an arbitrary occurrence of rupture, indicating a successful homogenization, coupled with a remarkable improvement in ductility, but to the costs of a lowered tensile strength, which was highly dependent on the chosen heat-treatment procedure.

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Impact of Molybdenum on Heat-Treatment and Microstructure of ADI

Materials Science Forum ◽

10.4028/www.scientific.net/msf.925.188 ◽

2018 ◽

Vol 925 ◽

pp. 188-195 ◽

Cited By ~ 1

Author(s):

Julius Alexander Gogolin ◽

Babette Tonn

Keyword(s):

Heat Treatment ◽

Tensile Strength ◽

Transition Point ◽

Outer Part ◽

Isothermal Transformation ◽

Mechanical Tests ◽

High Tensile Strength ◽

Manufacturing Costs ◽

Nickel Copper ◽

Quenching Process

Austempered Ductile Iron (ADI) is characterized by high tensile strength with acceptable ductility. Steel, as a large competitor to ADI, also meets the tensile and yield strength. Nevertheless, the main advantages of ADI compared to steel are the lower density (7.2 g/cm3 to 7.85 7.87 g/cm3) for weight reduction and lower manufacturing costs because of less energy consumption during the production. One of the main problems of producing ADI is the quenching process during heat treatment of thick-walled castings. The inner part of a massive casting – in contrast to the outer part – cools down more slowly, resulting in a heterogeneous microstructure with parts of pearlite and ferrite embedded in austenite before reaching the isothermal transformation temperature. Molybdenum is, besides nickel, copper and manganese, one of the possible alloying elements that postpone the transition point of ferrite and/or pearlite. To investigate the influence of molybdenum in thick-walled castings experiments with different molybdenum contents were performed. In dependence on the molybdenum content, different austenisation and ausferritisation temperatures and times are examined in order to investigate the transformation points, fraction and morphology of different phases. The mechanism of molybdenum in ADI has been investigated by means of dilatometer tests, microstructure analysis and mechanical tests.

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High Tensile Strength of Drawn Gold

Materials Science Forum ◽

10.4028/www.scientific.net/msf.495-497.907 ◽

2005 ◽

Vol 495-497 ◽

pp. 907-912 ◽

Cited By ~ 4

Author(s):

Suk Hoon Kang ◽

Hee Suk Jung ◽

Woong Ho Bang ◽

Jae Hyung Cho ◽

Kyu Hwan Oh ◽

...

Keyword(s):

Heat Treatment ◽

Grain Size ◽

Tensile Strength ◽

Treatment Process ◽

Gold Wire ◽

Equivalent Strain ◽

Heat Treatment Process ◽

High Tensile Strength ◽

Heat Treated ◽

Gold Wires

This paper studies the microstructure of drawn gold wires to equivalent strain of 10 and to equivalent strain of 8.5 then heat-treated. The texture of gold wire drawn to strain of 10 is mainly composed of <100> and <111> fibers. Tensile strength of the gold wire increases with <111> fiber fraction, while the grain size does not appear to affect the tensile property. With an exception at heat treatment at 600oC, the texture of gold wire drawn the strain of 8.5 is replaced with <100> fiber component by heat treatment process at 400~700oC. Heat treatment at 600oC produces <110> fiber or <112> fiber, depending upon annealing time.

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Improvement in Punching Properties of High Tensile Strength Steel Sheet by Heat-Treatments for Reduction of Center Segregation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.622-623.1075 ◽

2014 ◽

Vol 622-623 ◽

pp. 1075-1080 ◽

Cited By ~ 3

Author(s):

Kota Sakumoto ◽

Kazuhiko Yamazaki ◽

Takashi Kobayashi ◽

Shinsuke Suzuki

Keyword(s):

Heat Treatment ◽

Tensile Strength ◽

Crack Formation ◽

Expansion Ratio ◽

High Tensile Strength ◽

Burr Height ◽

Hole Expansion ◽

Steel Sheets ◽

Heat Treated ◽

Hole Expansion Ratio

We investigated punching properties (crack in punched surface and hole expansion ratio) of high tensile strength steel sheets with and without center segregation. High strength steel sheets were heat-treated to reduce center segregation. Tensile strength, shear surface ratio, depth of rollover and burr height were measured on heat-treated steel sheets to confirm the effect of heat-treatment on strength. The EPMA analysis showed that the center segregation of Mn was reduced by the diffusion during heat-treatment. Crack-formation frequency and hole expansion ratio were also measured. As a result, the center segregation of Mn in high tensile strength steel sheets decreased by the heat-treatment (600 oC for 100 h) with maintaining the tensile strength, the depth of rollover and the burr height. The crack-formation frequency of the steel sheets decreased through heat-treatments.

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J & L TYPE 301

Alloy Digest ◽

10.31399/asm.ad.ss0775 ◽

2000 ◽

Vol 49 (2) ◽

Keyword(s):

Heat Treatment ◽

Tensile Strength ◽

Cold Working ◽

Cold Deformation ◽

Heat Treating ◽

High Tensile Strength ◽

Annealed Condition ◽

Treatment Type ◽

Specialty Steel ◽

Strength And Ductility

Abstract Type 301 (UNS S30100) is an austenitic chromium-nickel stainless steel capable of attaining high tensile strength and ductility by cold working. It is not hardenable by heat treatment. Type 301 is essentially nonmagnetic in the annealed condition and becomes magnetic with cold deformation. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-775. Producer or source: J & L Specialty Steel Inc.

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Mechanical Properties of a β Containing Ti-Al-Cr-Alloy at Ambient and Elevated Temperatures

MRS Proceedings ◽

10.1557/proc-364-1017 ◽

1994 ◽

Vol 364 ◽

Author(s):

W. R. Chen ◽

J. Wang ◽

B. Zhang ◽

X. Wan ◽

W. J. Chen

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Ambient Temperature ◽

Strain Rate ◽

Temperature Dependence ◽

Elevated Temperatures ◽

High Tensile Strength ◽

Tial Alloys ◽

Β Phase ◽

Very High

AbstractThe mechanical properties of a β-containing Ti-Al-Cr alloy were investigated at ambient and elevated temperatures. The results show that the Ti-Al-Cr alloy containing the β phase has a very high tensile strength but a poor ductility at ambient temperature, and that higher ductility is obtained at high temperatures. The temperature dependence of mechanical properties is found to be sensitive to the strain rate during the test. Fractography shows that the fracture mode changes from fully brittle to ductile-brittle mixture with the increased temperature. All the results suggest that the triple-phased TiAl alloys (α2+β+γ) may have the combined mechanical properties of the dual-phased T13Al ((α2+β) and dual-phased TiAl (α2+γ) alloys.

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S.A.P.-865

Alloy Digest ◽

10.31399/asm.ad.al0146 ◽

1965 ◽

Vol 14 (8) ◽

Keyword(s):

Tensile Strength ◽

Corrosion Resistance ◽

High Temperature ◽

Room Temperature ◽

Elevated Temperatures ◽

Engineering Properties ◽

Powder Metal ◽

High Tensile Strength ◽

Temperature Performance ◽

Sintered Aluminum

Abstract SAP is a special Sintered Aluminum Powder characterized by high tensile strength at room temperature and at elevated temperatures. It features a range of useful engineering properties. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, machining, joining, and powder metal forms. Filing Code: Al-146. Producer or source: Aluminium Industrie Atkiengesellschaft.

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Effect of Heat Treatment on Tensile Strength of Direct Recycled Aluminium Alloy (AA6061)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.961.80 ◽

2019 ◽

Vol 961 ◽

pp. 80-87

Author(s):

Mohammad Hussein Rady ◽

Ahmed Sahib Mahdi ◽

Mohammad Sukri Mustapa ◽

Shazarel Shamsudin ◽

Mohd Amri Lajis ◽

...

Keyword(s):

Heat Treatment ◽

Tensile Strength ◽

Solid State ◽

Aging Process ◽

Hot Extrusion ◽

Extrusion Process ◽

High Tensile Strength ◽

Quenching Temperature ◽

Preheating Temperature ◽

Aluminum Chips

Products by solid-state recycling of aluminum chips in hot extrusion process were controlled by temperature related parameters using preheating temperature 450 °C, 500 °C, and 550 °C for 1 hr, 2 hr, and 3 hr preheating time. By using Design of Experiments (DOE), the results found that the preheating temperature is more important to be controlled rather than the preheating time and increasing of temperature led to the high tensile strength. The profile extruded at 550 °C with 3 hr duration had gained the optimum case to get the maximum tensile strength. For the optimum case, heat treatment was carried out using quenching temperature at 530 oC for 2 h and aging process at 175 oC for 4 h. The tensile strength of extrudes specimen was improved significantly compared to those of non-treated specimen.

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