Non-Isothermal Resistance Heating for Hot-Stamped Parts with Tailored Properties and Tempering Treatment on Directly Hot-Stamped Parts

Non-isothermal resistance heating in the hot stamping of quenchable steel sheets was developed to produce ultra-high strength steel formed parts with tailored properties. The heating temperature of parts is related with width of samples heated by resistance heating. With the same input energy, the strength in the narrow portions is high owing to the high energy density and that in the wide portions is low owing to the low energy density. Hat-shaped products having a tensile strength arrange from 600 MPA to 1800 MPa were formed. The tempering treatment on the directly hot-stamped boron steel resulted in better mechanical properties and higher formability index. The SEM figures indicates that the nano-carbide formation during the tempering treatment were suggested as the evident reasons for the occurrence of the mentioned robust properties. Finally the combination of temperature 250 ℃ and holding time 45 min can achieve the best comprehensive mechanical properties.

Download Full-text

Fabrication and characterization of the Ni–Al energetic structural material with high energy density and mechanical properties

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.154894 ◽

2020 ◽

Vol 832 ◽

pp. 154894

Author(s):

Qiang Zhou ◽

Qiwen Hu ◽

Bi Wang ◽

Bingbing Zhou ◽

Pengwan Chen ◽

...

Keyword(s):

Mechanical Properties ◽

Energy Density ◽

Structural Material ◽

High Energy ◽

High Energy Density ◽

Fabrication And Characterization

Download Full-text

Multilayered Al/Ni energetic structural materials with high energy density and mechanical properties prepared by a facile approach of electrodeposition and hot pressing

Materials Science and Engineering A ◽

10.1016/j.msea.2019.04.068 ◽

2019 ◽

Vol 757 ◽

pp. 23-31 ◽

Cited By ~ 2

Author(s):

Mingzhi Wang ◽

Liangsheng Qiu ◽

Xingjian Zhao ◽

Yuanzhou Li ◽

Tianheng Rao ◽

...

Keyword(s):

Mechanical Properties ◽

Energy Density ◽

Hot Pressing ◽

Structural Materials ◽

High Energy ◽

High Energy Density ◽

Energetic Structural Materials

Download Full-text

Microstructure and mechanical properties of titanium nitride coatings for cemented carbide cutting tools by pulsed high energy density plasma

Chinese Science Bulletin ◽

10.1007/bf03184169 ◽

2003 ◽

Vol 48 (13) ◽

pp. 1316-1320 ◽

Cited By ~ 4

Author(s):

Zhijian Peng ◽

Hezhuo Miao ◽

Longhao Qi ◽

Jianghong Gong ◽

Size Yang ◽

...

Keyword(s):

Mechanical Properties ◽

Energy Density ◽

Titanium Nitride ◽

Cutting Tools ◽

High Energy ◽

Cemented Carbide ◽

High Energy Density ◽

Microstructure And Mechanical Properties ◽

Nitride Coatings ◽

Density Plasma

Download Full-text

Microstructure and mechanical properties of titanium nitride coatings for cemented carbide cutting tools by pulsed high energy density plasma

Chinese Science Bulletin ◽

10.1360/02ww0234 ◽

2003 ◽

Vol 48 (13) ◽

pp. 1316 ◽

Cited By ~ 1

Author(s):

Zhijian PENG

Keyword(s):

Mechanical Properties ◽

Energy Density ◽

Titanium Nitride ◽

Cutting Tools ◽

High Energy ◽

Cemented Carbide ◽

High Energy Density ◽

Microstructure And Mechanical Properties ◽

Nitride Coatings ◽

Density Plasma

Download Full-text

Aramid fibre-based wearable electrochemical capacitors with high energy density and mechanical properties through chemical synergistic combination of multi-coatings

Electrochimica Acta ◽

10.1016/j.electacta.2018.07.155 ◽

2018 ◽

Vol 284 ◽

pp. 149-158 ◽

Cited By ~ 6

Author(s):

Hao Fang ◽

Li Yuan ◽

Guozheng Liang ◽

Aijuan Gu

Keyword(s):

Mechanical Properties ◽

Energy Density ◽

Electrochemical Capacitors ◽

High Energy ◽

Aramid Fibre ◽

High Energy Density ◽

Synergistic Combination

Download Full-text

Effect of Gradient Energy Density on the Microstructure and Mechanical Properties of Ti6Al4V Fabricated by Selective Electron Beam Additive Manufacture

Materials ◽

10.3390/ma13071509 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1509 ◽

Cited By ~ 2

Author(s):

Ta-I Hsu ◽

Yu-Ting Jhong ◽

Meng-Hsiu Tsai

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Electron Beam ◽

Additive Manufacturing ◽

Energy Density ◽

High Energy ◽

High Energy Density ◽

Positive Effects ◽

Microstructure And Mechanical Properties ◽

Gradient Energy

Selective Electron Beam Additive Manufacturing (SEBAM) is a promising powder bed fusion additive manufacturing technique for titanium alloys that select particular area melting in different energy density for producing complexly shaped biomedical devices. For most commercial Ti6Al4V porous medical devices, the gradient energy density is usually applied to manufacture in one component during the SEBAM process which selects different energy density built on particular zones. This paper presents gradient energy density base characterization study on an SEBAM built rectangular specimen with a size of 3 mm × 20 mm × 60 mm. The specimen was divided into three zones were built in gradient energy density from 16 to 26.5 J/mm3. The microstructure and mechanical properties were investigated by means of scanning electron microscopy, X-ray diffraction, transmission electron microscopy and mechanical test. The α′ martensitic and lack of fusion were observed in the low energy density (LED) built zone. However, no α′ phase and no irregular pores were observed both in overlap energy density (OED) and high energy density (HED) built zones located at the middle and bottom of the specimen respectively. This implies the top location and lower energy density have positive effects on the cooling rate but negative effects on densification. The subsequence mechanical properties result also supports this point. Moreover, the intermetallic Ti3Al found in the bottom may be due to the heat transfer from the following melting layer. Furthermore, the microstructure evolution in gradient energy built zones is discussed based on the findings of the microstructure and thermal history correlation analysis.

Download Full-text