Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Surface Machining by a Lathe on Microstructure of Near Surface Layer and Corrosion Behavior of SA182 Grade 304 Stainless Steel in Simulated Primary Water

  • Zhang, Zhiming (Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences) ;
  • Wang, Jianqiu (Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences) ;
  • Han, En-hou (Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences) ;
  • Ke, Wei (Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences)
  • Received : 2018.12.18
  • Accepted : 2019.01.23
  • Published : 2019.02.28
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Abstract

To find proper lathe machining parameters for SA182 Grade 304 stainless steel (SS), six kinds of samples with different machining surface states were prepared using a lathe. Surface morphologies and microstructures of near surface deformed layers on different samples were analysed. Surface morphologies and chemical composition of oxide films formed on different samples in simulated primary water with $100{\mu}g/L\;O_2$ at $310^{\circ}C$ were characterized. Results showed that surface roughness was mainly affected by lathe feed. Surface machining caused grain refinement at the top layer. A severely deformed layer with different thicknesses formed on all samples. In addition to high defect density caused by surface deformation, phase transformation, residual stress, and strain also affected the oxidation behaviour of SA182 Grade 304 SS in the test solution. Machining parameters used for # 4 (feed, 0.15 mm/r; back engagement, 2 mm; cutting speed, 114.86 m/min) and # 6 (feed,0.20 mm/r; back engagement, 1 mm; cutting speed, 73.01 m/min) samples were found to be proper for lathe machining of SA182 Grade 304 SS.

Keywords

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Fig. 1 SEM images showing surface morphologies of SA182 Grade 304 SS samples with different machining surface states by SEM: (a) 1#; (b) 2#; (c) 3#); (d) 4#; (e) 5#); (f) 6#.

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Fig. 2 Surface roughness values of SA182 Grade 304 SS samples with different machining surface states.

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Fig. 3 Grain images of near surface deformed layers of samplers with different surface states: (a) 1#; (b) 2#; (c) 3#); (d) 4#; (e) 5#); (f) 6#.

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Fig. 4 Surface morphologies of oxide films formed on SA182Grade 304 SS samples with different machining surface states after immersion in simulated primary water with 100 μg/L O2 at 310 °C and 11 MPa for 498 h.

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Fig. 5 Chemical composition of oxide films formed on SA182Grade 304 SS samples with different machining surface states by XPS after immersion in simulated primary water with 100 μg/L O2 at 310 °C and 11 MPa for 498 h.

Table 1 Chemical composition of SA182 Grade 304 (wt%)

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Table 2 The specific machining parameters of 6 kinds of samples by lathe

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