Abstract
The mechanical properties and deformation microstructure of cast 304 Cu-containing austenitic stainless steel at 10−3/s strain rate in the range of 700~1200 °C were studied by Gleeble thermal simulator, metallographic microscope and scanning electron microscope. The results showed that the thermoplasticity of 304 Cu-containing austenitic stainless steel was higher than 60% when the temperature was higher than 1000 °C, and the tensile strength as a whole decreased with the increase in temperature. During the tensile process, the morphology and content of ferrite in the test steel were the main factors affecting the high-temperature thermoplastic of the billet. The inclusions near the fracture and the existence of ferrite at the grain boundary greatly affected the formation of microcracks and holes and the fracture.
Highlights
Due to its excellent corrosion resistance and broad-spectrum antibacterial properties, Copper (Cu)-containing austenitic antibacterial stainless steel has been used extensively in many fields, such as kitchen appliances, food processing, medical health, and public facilities [1,2,3]
The crack sensitivity of the billet is directly related to the high-temperature tensile strength and thermoplasticity of the steel [7,8,9,10]
Yang [11] found that the 0Cr18Ni9 antibacterial stainless steel containing 3.71 wt.% Cu obtained good thermoplasticity at 1050~1200 ◦C, and excellent section shrinkage rate, which obviously avoided the generation of cracks in the subsequent single-pass rolling process
Summary
Due to its excellent corrosion resistance and broad-spectrum antibacterial properties, Copper (Cu)-containing austenitic antibacterial stainless steel has been used extensively in many fields, such as kitchen appliances, food processing, medical health, and public facilities [1,2,3]. Cu-rich phase with a low-melting point are formed in Cu-containing austenite antibacterial stainless steel due to the selective enrichment of Cu elements, which is prone to surface cracks during the continuous casting production process [4,5,6]. Yang [11] found that the 0Cr18Ni9 antibacterial stainless steel containing 3.71 wt.% Cu obtained good thermoplasticity at 1050~1200 ◦C, and excellent section shrinkage rate, which obviously avoided the generation of cracks in the subsequent single-pass rolling process. By comparing the stress-strain curve with Figure 3, it can be seen that the variation trend of section shrinkage was consistent with that of elongation, indicating that the high temperature thermoplasticity of steel above 1000 °C was excellent.
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