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| Mechanism of Ti Microalloying on Regulating the Second Phase and Strength-toughness in 35MnB Steel |
HUANG Hongxin1,2, LIAO Bing1,2, HAO Luhan2( ), QIN Shuyang2, HU Xiaoqiang1(), ZHENG Leigang1, SHI Weiwei3, CAI Changqing3 |
1.Shenyang National Laboratory for Material Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2.National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
3.Fujian Sansteel Minguang Co. , Ltd. , Sanming 365000, China |
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Cite this article:
HUANG Hongxin, LIAO Bing, HAO Luhan, QIN Shuyang, HU Xiaoqiang, ZHENG Leigang, SHI Weiwei, CAI Changqing. Mechanism of Ti Microalloying on Regulating the Second Phase and Strength-toughness in 35MnB Steel. Chinese Journal of Materials Research, 2026, 40(4): 285-294.
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Abstract 35MnB steel, a low-alloy high-strength steel, is used for making track shoes, yet its properties fail to meet the requirements of new-generation track steels due to detrimental inclusions (BN, MnS, etc.) formed during smelting and solidification processes. To mitigate the detrimental effect of inclusions, herein, the influence of Ti microalloying on the formation and distribution of secondary phase particles and mechanical properties of 35MnB steel was systematically investigated by means of techniques such as XRD, SEM, EBSD, and TEM, as well as Aspex inclusion analysis system and universal testing machine, etc. The results demonstrate that Ti addition effectively optimizes inclusion distribution, remarkably refines grains, and enhances the mechanical properties of the alloy steel. Notably, with the addition of 0.045% (mass fraction) Ti, the Ti-micro-alloyed steel exhibits > 50% improvement in impact toughness compared to that of the Ti-free steel, therewith, an optimal regulation of secondary phase particles may be acquired for simultaneous enhancement in strength-toughness. The strengthening mechanisms may involve Ti reacting with C and N to form secondary phase particles that pin grain boundaries and dislocations, while inhibiting the high-temperature coarsening of austenite grains, thereby refining grains, stabilizing grain boundaries, increasing dislocation density, and ultimately improving the performance of the 35MnB steel.
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Received: 19 May 2025
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| Fund: Science and Technology Service from Chinese Academy of Sciences in Fujian Province(2023T3062) |
Corresponding Authors:
HU Xiaoqiang, Tel: (024)23971127, E-mail: xqhu@imr.ac.cn;
HAO Luhan, Tel: (0335)8387652, E-mail: lhhao@ysu.edu.cn
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