材料科学
极限抗拉强度
液氮
复合材料
加工硬化
液氦
变形(气象学)
冶金
沉淀硬化
严重塑性变形
硬化(计算)
降水
粒度
氦
微观结构
物理
原子物理学
量子力学
图层(电子)
气象学
作者
Alica Fedoriková,Patrik Petroušek,Tibor Kvačkaj,Róbert Kočiško,Michal Zemko
出处
期刊:Materials
[MDPI AG]
日期:2023-09-29
卷期号:16 (19): 6473-6473
摘要
The article deals with increasing the mechanical properties of stainless steel 316 Ln-IG, which is intended for work in cryogenic temperatures (liquid nitrogen and liquid helium), such as conductor conduits for the ITER magnet system. The strength and plastic properties were increased by a combination of cold and cryo-rolling and heat treatment. The mechanical properties of rolled material were investigated at 293 K, 77 K, and 4.2 K. The work-hardening rate of the steel increased continuously with a lowering of the temperature. The maximum yield strength and ultimate tensile strength were achieved by the cryo-rolling process with a total thickness deformation of 50%. The material properties tested at ambient temperature were 0.2YS = 1050 MPa, UTS = 1200 MPa, and at 4.2 K, the values were 0.2YS = 1804 MPa and UTS = 2081 MPa. Two types of long-term heat treatment were applied after experimental rolling (823 K and 1093 K for 10 h). The highest precipitation hardening of steel was achieved at a temperature of 823 K after 50% deformation. The resulting grain size decreased from the initial 216 μm (before the rolling process) to 70 μm after ambient rolling and 72 μm after cryo-rolling.
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