Effect of Rolling in the Recrystallization Temperature Region Associated with a Post-Heat Treatment on the Microstructure, Crystal Orientation, and Mechanical Properties of API 5L X70 Pipeline Steel

The effect of volume fraction of ferrite on the mechanical properties including strength, plasticity and wok hardening was systematically investigated in X80 pipeline steel in order to improve the plasticity. The microstructures with different volume fraction of ferrite and bainite were obtained by heat-treatment processing and the mechanical properties were tested. The work hardening behavior was analyzed by C-J method. The results show that the small amount of ferrite could effectively improve the plasticity. The work hardening ability and the ratio of yield/tensile strength with two phases of ferrite/bainite would be obviously better than that with single phase of bainite. The improvement of plasticity could be attributed to the ferrite in which more plastic deformation was afforded.

Download Full-text

Effect of heat treatment on mechanical properties of 3D printed polylactic acid parts

Materials Testing ◽

10.1515/mt-2020-0010 ◽

2021 ◽

Vol 63 (1) ◽

pp. 73-78

Author(s):

Pulkin Gupta ◽

Sudha Kumari ◽

Abhishek Gupta ◽

Ankit Kumar Sinha ◽

Prashant Jindal

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Polylactic Acid ◽

Recrystallization Temperature ◽

Fused Deposition Modelling ◽

Fused Deposition ◽

Dog Bone ◽

Heat Treated ◽

Maximum Decrease ◽

3D Printed

Abstract Fused deposition modelling (FDM) is a layer-by-layer manufacturing process type of 3D-printing (3DP). Significant variation in the mechanical properties of 3D printed specimens is observed because of varied process parameters and interfacial bonding between consecutive layers. This study investigates the influence of heat treatment on the mechanical strength of FDM 3D printed Polylactic acid (PLA) parts with constant 3DP parameters and ambient conditions. To meet the objectives, 7 sets, each containing 5 dog-bone shaped samples, were fabricated from commercially available PLA filament. Each set was subjected to heat treatment at a particular temperature for 1 h and cooled in the furnace itself, while one set was left un-treated. The temperature for heat treatment (Th) varied from 30 °C to 130 °C with increments of 10 °C. The heat-treated samples were characterized under tensile loading of 400 N and mechanical properties like Young’s modulus (E), Strain % ( ε ) and Stiffness (k) were evaluated. On comparing the mechanical properties of heat-treated samples to un-treated samples, significant improvements were observed. Heat treatment also altered the geometries of the samples. Mechanical properties improved by 4.88 % to 10.26 % with the maximum being at Th of 110 °C and below recrystallization temperature (Tr) of 65 °C. Deformations also decreased significantly at higher temperatures above 100 °C, by a maximum of 36.06 %. The dimensions of samples showed a maximum decrease of 1.08 % in Tr range and a maximum decrease of 0.31 % in weight at the same temperature. This study aims to benefit the society by establishing suitable Th to recover the lost strength in PLA based FDM 3D printed parts.

Download Full-text

Effect of Annealing Process on the Mechanical Properties of X70 Pipeline Steel

MATEC Web of Conferences ◽

10.1051/matecconf/201818602001 ◽

2018 ◽

Vol 186 ◽

pp. 02001

Author(s):

Teng-wei Zhu ◽

Cheng-liang Miao ◽

Zheng Cheng ◽

Zhipeng Wang ◽

Yang Cui ◽

...

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

Tensile Strength ◽

Annealing Temperature ◽

Pipeline Steel ◽

Annealing Process ◽

X70 Pipeline Steel ◽

Grain Sizes ◽

Scanning Electron

The influence of the mechanical properties of X70 pipeline steel under different annealing temperature was studied. The corresponding microstructure was investigated by the Field Emission Scanning Electron Microscopy. The results showed that the yield strength and the tensile strength both experienced from rise to decline with the increase of annealing temperature. The grain sizes were coarse and a large amount of cementite precipitated due to preserving temperature above 550 °, which induced matrix fragmentation and deteriorate the -10 ° DWTT Toughness. There were little changes on the microstructure and mechanical properties when the annealing temperature was under 500 °.

Download Full-text

Additive Manufacturing: A Review of the Influence of Building Orientation and Post Heat Treatment on the Mechanical Properties of Aluminium Alloys

Advanced Structured Materials - State of the Art and Future Trends in Material Modeling ◽

10.1007/978-3-030-30355-6_14 ◽

2019 ◽

pp. 349-366

Author(s):

Enes Sert ◽

Andreas Öchsner ◽

Leonhard Hitzler ◽

Ewald Werner ◽

Markus Merkel

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Additive Manufacturing ◽

Aluminium Alloys ◽

Post Heat Treatment ◽

Building Orientation

Download Full-text

Heat Treatment Effect on Mechanical Properties of 3D Printed Polymers

MATEC Web of Conferences ◽

10.1051/matecconf/201926402001 ◽

2019 ◽

Vol 264 ◽

pp. 02001 ◽

Cited By ~ 1

Author(s):

Eduardo de Avila ◽

Jaeseok Eo ◽

Jihye Kim ◽

Namsoo P. Kim

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Treatment Effect ◽

Biomedical Applications ◽

Treatment Process ◽

Heat Treatment Process ◽

Post Heat Treatment ◽

Intraocular Surgery ◽

Osteoinductive Potential ◽

3D Printed

PMMA, PC, and PEEK are thermoplastic polymers that possess favorable properties for biomedical applications. These polymers have been used in fields of maxillo-facial, orthopedic, intraocular surgery, and bio-implant, due to their excellent mechanical properties, osteoinductive potential, and antimicrobial capabilities. In this study, the effect of heat treatment on the mechanical properties of 3D printed polymers was characterized. By modifying printing temperature and post heat treatment process, the mechanical properties were specifically tailored for different applications, correlating with the properties of the implants that are commonly made using molding processes.

Download Full-text

Effect of low partial hydrogen in a mixture with methane on the mechanical properties of X70 pipeline steel

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.11.013 ◽

2020 ◽

Vol 45 (3) ◽

pp. 2368-2381 ◽

Cited By ~ 7

Author(s):

Thanh Tuan Nguyen ◽

Jaeyeong Park ◽

Woo Sik Kim ◽

Seung Hoon Nahm ◽

Un Bong Beak

Keyword(s):

Mechanical Properties ◽

Pipeline Steel ◽

X70 Pipeline Steel

Download Full-text

Effects of Post Heat Treatment on the Mechanical Properties of Cold-Rolled Ti/Cu Clad Sheet

Metals ◽

10.3390/met10121672 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1672

Author(s):

Chang-Suk Youn ◽

Dong-Geun Lee

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Rolling Process ◽

Post Treatment ◽

Post Heat Treatment ◽

Clad Sheet ◽

Heat Treated ◽

Bonding Properties ◽

High Elongation ◽

Cold Rolled

Titanium and titanium alloys have excellent corrosion and heat resistance, but weak electric and thermal conductivity. The weak conductivity of titanium can be overcome by cladding with copper, which has high conductivity. Although titanium is expensive, it is selected as a material suitable for applications requiring corrosion resistance such as in heat exchangers. This study was to investigate the effect of post heat treatment on the mechanical properties of the Ti/Cu cold-rolled clad plate by using the interfacial diffusion bonding. A titanium clad by cold rolling should be heat-treated after the rolling process to improve the bonding properties through the diffusion of metals and removal of residual stress due to work hardening, despite the easy formation of intermetallic compounds of Ti and Cu. As a result post-treatment, the elongation was improved by more than two times from 21% to max. 53% by the Ti-Cu interface diffusion phenomenon and the average tensile strength of the 450 °C heat-treated specimens was 353 MPa. By securing high elongation while maintaining excellent tensile and yield strength through post-treatment, the formability of Ti-Cu clad plate can be greatly improved.

Download Full-text