Extending the boundaries of mechanical properties of Ti-Nb low-carbon steel via combination of ultrafast cooling and deformation during austenite-to-ferrite transformation
Extending the boundaries of mechanical properties of Ti-Nb low-carbon steel via combination of ultrafast cooling and deformation during austenite-to-ferrite transformation
复制标题
通过奥氏体向铁素体转变过程中超快冷却和变形的结合，扩展 Ti-Nb 低碳钢的机械性能范围
DOI：
10.1007/s12540-017-6241-8
复制
发表时间：
2017-01
影响因子：
3.5
通讯作者：
Misra R. D. K.
中科院分区：
文献类型：
--
作者：
Deng Xiangtao;Fu Tianliang;Wang Zhaodong;Liu Guohuai;Wang Guodong;Misra R. D. K.
我们在这里强调一种新方法，通过奥氏体到铁素体转变过程中超快冷却和变形的结合来扩展 Ti-Nb 低碳钢的机械性能界限。所提出的方法产生了精细的微观结构和高密度纳米尺寸的沉淀物，从而提高了强度。钢在奥氏体向铁素体转变过程中进行超快冷却导致屈服强度增加145 MPa，而超快冷却过程后的小变形导致强度增加275 MPa。超快冷细化了铁素体和珠光体成分并使其均匀弥散，而超快冷后的变形则促进析出，将片状珠光体破碎为球状渗碳体和长薄条状的FexC。对于超快冷却和变形加超快冷却过程，纳米级析出物对屈服强度的贡献估计约为 247.9 MPa 和 358.3 MPa。纳米析出碳化物被鉴定为(Ti,Nb)C，具有NaCl型晶体结构，与铁素体基体遵循Baker-Nutting取向关系。
We underscore here a novel approach to extend the boundaries of mechanical properties of Ti-Nb low-carbon steel via combination of ultrafast cooling and deformation during austenite-to-ferrite transformation. The proposed approach yields a refined microstructure and high density nano-sized precipitates, with consequent increase in strength. Steels subjected to ultra-fast cooling during austenite-to-ferrite transformation led to 145 MPa increase in yield strength, while the small deformation after ultra-fast cooling process led to increase in strength of 275 MPa. The ultra-fast cooling refined the ferrite and pearlite constituents and enabled uniform dispersion, while the deformation after ultra-fast cooling promoted precipitation and broke the lamellar pearlite to spherical cementite and long thin strips of FexC. The contribution of nano-sized precipitates to yield strength was estimated to be ~247.9 MPa and ~358.3 MPa for ultrafast cooling and deformation plus ultrafast cooling processes. The nano precipitates carbides were identified to be (Ti, Nb)C and had a NaCl-type crystal structure, and obeyed the Baker-Nutting orientation relationship with the ferrite matrix.
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影响因子：
8.6
作者：
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通讯作者：
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影响因子：
1.8
作者：
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影响因子：
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DOI：
10.1016/j.msea.2007.11.110
发表时间：
2009-01-15
影响因子：
6.4
作者：
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通讯作者：
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DOI：
10.1016/j.msea.2005.01.049
发表时间：
2005-06-15
影响因子：
6.4
作者：
Prasad, SN;Sarma, DS
通讯作者：
Sarma, DS