Development of high strength ductile eutectoid steel through cyclic heat treatment involving incomplete austenitization followed by forced air cooling

2016 ◽  
Vol 114 ◽  
pp. 277-288 ◽  
Author(s):  
Alok Mishra ◽  
Atanu Saha ◽  
Joydeep Maity
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Air Cooling ◽  
Eutectoid Steel ◽  
Cyclic Heat Treatment ◽  
Cyclic Heat ◽  
Forced Air

scholarly journals Improvement of toughness and hardness in BR1500HS steel by ultrafine martensite

2020 ◽  
Vol 39 (1) ◽  
pp. 281-290
Author(s):  
Li-Yong Wang ◽  
Le Li
Keyword(s):  
Heat Treatment ◽  
Heating Temperature ◽  
Heat Rate ◽  
High Strength ◽  
Optical Microscope ◽  
Holding Time ◽  
Cyclic Heat Treatment ◽  
Cyclic Heat ◽  
Lath Width ◽  
Thermal Dilation

AbstractTo obtain the ultrafine martensite for BR1500HS ultra-high-strength steel, a new preparation process of cyclic heat treatment (CHT) with descending heat temperature and holding time along with cycle steps was developed. First, a series of thermal dilation tests were conducted with the temperature range of 420–730°C and the heat rate of 5 K/s on a Gleeble-3800 thermomechanical physical simulator. According to the experimental data, the temperature ranges and the optimal holding time to completely austenitize BR1500HS were determined. Then, to confirm the optimal parameters of CHT for BR1500HS, several tests with various temperatures and cycle steps were conducted and analyzed by optical microscope and scanning electron microscope. Subsequently, the CHTs with decreasing heating temperature and holding time were studied due to the increasing internal energy of steel along with the CHT process. The lath width was measured as a criterion to evaluate the refinement degree in this article. After several loops of heat treatment, the lath width is reduced to 0.268 µm. Finally, the hardness evolution of the specimens subjected to CHT in this study was analyzed and compared with the lath width test results, which justified the effectiveness of the new developed process.

Oxidation resistance of TiAl alloy improved by hot-pack rolling and cyclic heat treatment

2021 ◽  
pp. 111196
Author(s):  
Tian Shiwei ◽  
He Anrui ◽  
Liu Jianhua ◽  
Zhang Yefei ◽  
Yang Yonggang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Oxidation Resistance ◽  
Tial Alloy ◽  
Cyclic Heat Treatment ◽  
Pack Rolling ◽  
Cyclic Heat ◽  
Hot Pack

scholarly journals Laser Powder Bed Fusion Processing of Fe-Mn-Al-Ni Shape Memory Alloy—On the Effect of Elevated Platform Temperatures

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 185
Author(s):  
Felix Clemens Ewald ◽  
Florian Brenne ◽  
Tobias Gustmann ◽  
Malte Vollmer ◽  
Philipp Krooß ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Crack Formation ◽  
Microstructural Analysis ◽  
Tensile Load ◽  
Grain Structure ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Cyclic Heat Treatment ◽  
Powder Bed ◽  
Cyclic Heat

In order to overcome constraints related to crack formation during additive processing (laser powder bed fusion, L-BPF) of Fe-Mn-Al-Ni, the potential of high-temperature L-PBF processing was investigated in the present study. The effect of the process parameters on crack formation, grain structure, and phase distribution in the as-built condition, as well as in the course of cyclic heat treatment was examined by microstructural analysis. Optimized processing parameters were applied to fabricate cylindrical samples featuring a crack-free and columnar grained microstructure. In the course of cyclic heat treatment, abnormal grain growth (AGG) sets in, eventually promoting the evolution of a bamboo like microstructure. Testing under tensile load revealed a well-defined stress plateau and reversible strains of up to 4%.

Glass-limited Yb/Er:NaLuF4 nanocrystals: reversible hexagonal-to-cubic phase transition and anti-counterfeiting

2020 ◽  
Vol 8 (45) ◽  
pp. 16151-16159
Author(s):  
Shaoxiong Wang ◽  
Jidong Lin ◽  
Xiaoyan Li ◽  
Jiangkun Chen ◽  
Changbin Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Hexagonal Phase ◽  
Cubic Phase ◽  
Practical Application ◽  
Cyclic Heat Treatment ◽  
Cyclic Heat ◽  
High Level

Yb/Er:NaLuF4@glass with in situ reversible cubic-to-hexagonal phase transition on cyclic heat-treatment shows practical application in high-level anticounterfeiting.

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