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Preparation and Microstructure Evolution of Continuous Unidirectional Solidification Tin Bronze Alloy at Different Continuous Casting Speed

Jihui Luo
Archives of Foundry Engineering | 2020 | vol. 20 | No 2 | 118-122 | DOI: 10.24425/afe.2020.131313
Keywords Continuous unidirectional solidification Tin bronze Microstructure evolution Continuous casting speed
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Abstract

The mold temperature of the downward continuous unidirectional solidification (CUS) cannot be controlled higher than the liquidus of alloys to be cast. Therefore, the continuous casting speed becomes the main parameter for controlling the growth of columnar crystal structure of the alloy. In this paper, the tin bronze alloy was prepared by the downward CUS process. The microstructure evolution of the CUS tin bronze alloy at different continuous casting speeds was analysed. In order to further explain the columnar crystal evolution, a relation between the growth rate of columnar crystal and the continuous casting speed during the CUS process was built. The results show that the CUS tin bronze alloy mainly consists of columnar crystals and equiaxed crystals when the casting speed is low. As the continuous casting speed increases, the equiaxed crystals begin to disappear. The diameter of the columnar crystal increases with the continuous casting speed increasing and the number of columnar crystal decreases. The growth rate of columnar crystal increases with increasing of the continuous casting speed during CUS tin bronze alloy process.

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Authors and Affiliations

Jihui Luo

Effect of Cyclic Heat Treatment on Microstructure Evolution of TA15 Titanium Alloy

Dan-Ya Zhang Zhi-Sheng Nong Tian-Xing Wang
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 869-874 | DOI: 10.24425/amm.2023.145449
Keywords TA15 titanium alloy Cyclic heat treatment Microstructure evolution
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Abstract

To investigate the effect of cyclic heat treatment on the microstructure evolution of titanium alloys, TA15 alloys were subjected to different numbers of heat treatment cycles at various temperatures in the (α + β) two-phase region. The resulting microstructure and hardness of the alloy were characterized by using the metallographic microscopy, scanning electron microscopy, and Vickers hardness testing. The morphology of the initial TA15 alloy was nearly equiaxed structure. The α phase content, thickness of the oxygen-rich α layer, and hardness of the TA15 alloy increased with the number of cycles. The morphology of the TA15 alloy changed into the Widmannstatten structure when the alloy underwent six cycles of heat treatment between 970 and 800°C. The thickness of the oxygen-rich α layer and hardness of the alloy increased with the lower limit temperature of the cyclic heat treatment. Compared with the number of cycles, the lower limit temperature of the cyclic heat treatment was a more significant factor on the microstructure evolution of the TA15 titanium alloy.
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Authors and Affiliations

Dan-Ya Zhang
1
Zhi-Sheng Nong
2
Tian-Xing Wang
2
  1. Shenyang Aerospace University, Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang110136, China
  2. Shenyang Aerospace University, School of Materials Science and Engineering, Shenyang 110136, China

Microstructure Evolution and Wear Resistance of Boron-Bearing High Speed Steel Roll

Cheng Xiaole Hou Jianqiang Fu Hanguang
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 1 | 113-119 | DOI: 10.24425/amm.2022.137479
Keywords Boron-bearing high speed steel rolls Microstructure evolution Modification treatment wear resistance
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Abstract

The microstructure evolution of boron-bearing high speed steel roll materials after casting and tempering was investigated. The results indicate that as-cast boron-bearing high speed steel consists of martensitic matrix, retained austenite and different borocarbides. The as-cast alloy has a hardness above 64 HRC, and the borocarbides distribute along the grain boundaries. After RE-Mg-Ti compound modification treatment, obvious necking and broken network appear in the grain boundaries. The hardness of boron-bearing high speed steel roll materials reduces gradually with the increase of tempering temperature. Under the same conditions, the toughness of the modified roll material is higher than that of the unmodified roll material. Wear tests show that the wear resistance of boron-bearing high-speed steel modified by RE-Mg-Ti compound modification treatment is better.
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Authors and Affiliations

Cheng Xiaole
1
Hou Jianqiang
2
Fu Hanguang
1
  1. School of Mechanical and Electrical Engineering, Xi’an Polytechnic University, Xi’an 710048, Shaanxi province, P. R. China
  2. MCC Jingcheng Engineering Technology Co., Ltd., Beijing 100176, P.R. China

Microstructure Evolution Mechanism of AISI 1045 Steel Under High Speed Deformation

Lingen Luo Jianming Pang Yaoxin Song Shulan Liu Guoliang Yin Hao Peng Chunlei Pu Yinhe Lin Jingwei Li Xuefeng Shi
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 4 | 1525-1531 | DOI: 10.24425/amm.2023.146219
Keywords High speed cutting Continue dynamic recrystallization Microstructure evolution Microstructure AISI 1045 steel
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Abstract

AISI 1045 steel has the characteristics of high strain rate, large strain, and sharp rise in temperature during high-speed deformation process, resulting in a concentrated deformation band and fine structure. In this work, the microstructure of submicron-sized grains in AISI 1045 steel material formed under 10 6 s –1 during a high speed cutting process was examined. To reveal the dynamic evolution mechanism of the AISI 1045 microstructure, the continuous dynamic recrystallization theory was introduced. The results show a high dislocation density which favor the formation of small angle grain boundaries during the high speed cutting process. Kinetics calculations that use continuous dynamic recrystallization mechanisms prove that the recrystallization size is constant when the strain rate ncreases from 10 3 s –1 to 10 6 s –1, and the transition time is reduced from 6×10 –5 s to 4×10 –8 s. The recrystallization grains were gradually formed during the deformation of the material, not generated after the deformation.
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Authors and Affiliations

Lingen Luo
1
Jianming Pang
1
Yaoxin Song
1
Shulan Liu
2
Guoliang Yin
3
Hao Peng
4
Chunlei Pu
5
Yinhe Lin
4
Jingwei Li
6
Xuefeng Shi
7
  1. Resource Application and Alloy Materials Division, China Iron and Steel Research Institute Group, Beijing, 100081, P.R. China
  2. Tangshan Normal University, School of Physical Science and Technology, Tangshan, 063000, P.R. China
  3. Yibin University, Depart ment of Materials and Chemical Engineering, Yibin, 644000, P.R. China
  4. Yangtze Normal University, Institute of Chemical Engineering, Chongqing, 408100, P.R. China
  5. MCC Huatian Engineering & Technology Corporation, Nanjing, 210019, P.R. China
  6. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, P.R. China
  7. North China University of Science and Technology, College of Metallurgy and Energy, Tangshan, 063210, P.R. China

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