Nano-grain evolution in austenitic stainless steel during multi-directional forging
Nano-grain evolution in austenitic stainless steel during multi-directional forging
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DOI：
10.1016/j.msea.2010.10.018
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发表时间：
2011-01-25
期刊：
影响因子：
6.4
通讯作者：
Miura, H.
中科院分区：
文献类型：
--
作者：
Nakao, Y.;Miura, H.
在 77K 和 300 K 的温度下研究了奥氏体不锈钢 (SUS 316) 在多向锻造 (MDF) 过程中的纳米晶粒演变。MDF 过程中的流变应力和室温硬度随着累积应变的增加而显着增加。初始晶粒通过机械孪晶和马氏体转变而细分。由间距为 10-300 nm 的层状结构机械孪晶组成的包的形成增强了晶粒破碎。数据包大小范围为 40 nm 至 100 nm，具体取决于 MDF 温度和累积应变。环境温度下的拉伸测试显示最大屈服强度为 2.1 GPa。虽然保证强度随着累积应变而增加，但断裂时的塑性应变大约为 10%，与累积应变无关，超过 Sigma Delta epsilon = 2.4。 (C) 2010 Elsevier B.V. 保留所有权利。
Nano-grain evolution in an austenitic stainless steel (SUS 316) during multidirectional forging (MDF) was investigated at temperatures of 77K and 300 K. The flow stress during MDF and the room-temperature hardness increased significantly with increasing cumulative strain. The initial grains were subdivided by mechanical twinning and martensitic transformation. The formation of packets, which are composed of lamellar-structured mechanical twins with a spacing of 10-300 nm, enhanced grain fragmentation. The packet size ranged from 40 nm to 100 nm depending on the MDF temperature and the cumulative strain. Tensile tests at ambient temperatures revealed a maximum proof strength of 2.1 GPa. While the proof strength increased with cumulative strain, the plastic strain at fracture was approximately 10% independent of the cumulative strain over Sigma Delta epsilon = 2.4. (C) 2010 Elsevier B.V. All rights reserved.