Effect of microstructure refinement on the strength and toughness of low alloy martensitic steel

被引：0

作者：

Wang, Chunfang ^{[1
]}

Wang, Maoqiu ^{[1
]}

Shi, Jie ^{[1
]}

Hui, Weijun ^{[1
]}

Dong, Han ^{[1
]}

机构：

[1] Natl Engn Res Ctr Adv Steel Technol, Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2007年 / 23卷 / 05期

关键词：

martensitic steel; grain refinement; strength; impact toughness; cleavage fracture;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Martensitic microstructure in quenched and tempered 17CrNiMo6 steel with the prior austenite grain size ranging from 6 pm to 199 pm has been characterized by optical metallography (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The yield strength and the toughness of the steel with various prior austenite grain sizes were tested and correlated with microstructure characteristics. Results show that both the prior austenite grain size and the martensitic packet size in the 17CrNiMo6 steel follow a Hall-Petch relation with the yield strength. When the prior austenite grain size was refined from 199 pm to 6 pm, the yield strength increased by 235 MPa, while the Charpy U-notch impact energy at 77 K improved more than 8 times, indicating that microstructure refinement is more effective in improving the resistance to cleavage fracture than in increasing the strength. The fracture surfaces implied that the unit crack path for cleavage fracture is identified as being the packet.

引用

页码：659 / 664

页数：6

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