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7. Effect of Ti Microalloying on the Structure and Properties of High Manganese Steel

Author

Pan Hujiang, Yang Xinming, Li Guangqiang, Yang Zhizheng, Huo Xudong

Subjects
ti micro-alloying； mn18 high mn steel；mechanical property； inclusions； failure of product, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

The effects of Ti microalloying on the microstructure and mechanical property of Mn18 steel were studied， and the reasons for the failure of Mn18 hammer heads were analyzed. The results show that Ti microalloying has the effects of refining grain， increasing impact toughness， elongation， strength and hardness in Mn18 steel. When 0.10% and 0.30% w［Ti］ are added to Mn18 steel， as the Ti content increases， the hardness and strength of high manganese steel increase，and the impact toughness and elongation also show an optimization trend. When it continues to increase Ti to 0. 51%， in addition to the continuous increase of Brinell hardness， the KU2 value and stability， strength stability， the elongation and other indicators all have a downward trend. High manganese steel belongs to high nitrogen austenitic steel， and after adding Ti， a large amount of TiN is rapidly precipitated as a heterogeneous core， playing a series of beneficial roles. If the addition amount is too large， the size of TiN type inclusions is too large and local aggregation occurs， which has a negative impact on the performance stability of Mn18 and is easily prone to fracture and failure of Mn18 steel hammer heads. To ensure its beneficial effect， the content of Ti microalloying used in Mn18 steel should not exceed 0.30%.

Published
2024
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48. Giant Negative Thermal Expansion Induced by the Synergistic Effects of Ferroelectrostriction and Spin-Crossover in PbTiO3-Based Perovskites

Author

Pan, Zhao, Chen, Jun, Yu, Runze, Patra, Lokanath, Ravindran, Ponniah, Sanson, Andrea, Milazzo, Ruggero, Carnera, Alberto, Hu, Lei, Yamamoto, Hajime, Ren, Yang, Huang, Qingzhen, Sakai, Yuki, Nishikubo, Takumi, Ogata, Takahiro, Fan, Xian, Li, Yawei, Li, Guangqiang, Hojo, Hajime, Azuma, Masaki, and Xing, Xianran

Subjects
Condensed Matter - Materials Science
Abstract

The discovery of unusual negative thermal expansion (NTE) provides the opportunity to control the common but much desired property of thermal expansion, which is valuable not only in scientific interests but also in practical applications. However, most of the available NTE materials are limited to a narrow temperature range, and the NTE effect is generally weakened by means of various modifications. Here, we report an enhanced NTE effect that occurs over a wide temperature range (\alpha V = -5.24 * 10-5 {\deg}C^-1, 25-575 {\deg} C), and this NTE effect is accompanied by an abnormal enhanced tetragonality, a large spontaneous polarization, and a G-type antiferromagnetic ordering in the present perovskite-type ferroelectric of (1-x)PbTiO3-xBiCoO3. Specifically, for the composition of 0.5PbTiO3-0.5BiCoO3, an extensive volumetric contraction of ~4.8 % has been observed near the Curie temperature of 700 {\deg}C, which represents the highest level in PbTiO3-based ferroelectrics. According to our experimental and theoretical results, the giant NTE originates from a synergistic effect of the ferroelectrostriction and spin-crossover of cobalt on the crystal lattice. The actual NTE mechanism is contrasted with previous functional NTE materials, in which the NTE is simply coupled with one ordering such as electronic, magnetic, or ferroelectric ordering. The present study sheds light on the understanding of NTE mechanisms and it attests that NTE could be simultaneouslycoupled with different orderings, which will pave a new way toward the design of large NTE materials., Comment: 30 pages

Published
2019
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