Volume 65 Issue 11
Nov.  2021
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PAN Mengzhong, ZHAO Jin, MA Dengde, ZHANG Yajun, QIU Zhonghong, LIU Hailong, YAN Haitao. Uncertainty Evaluation for Measurements of Detrimental Intermetallic Phase in Duplex Steels[J]. Metrology Science and Technology, 2021, 65(11): 68-71. doi: 10.12338/j.issn.2096-9015.2021.0075
Citation: PAN Mengzhong, ZHAO Jin, MA Dengde, ZHANG Yajun, QIU Zhonghong, LIU Hailong, YAN Haitao. Uncertainty Evaluation for Measurements of Detrimental Intermetallic Phase in Duplex Steels[J]. Metrology Science and Technology, 2021, 65(11): 68-71. doi: 10.12338/j.issn.2096-9015.2021.0075

Uncertainty Evaluation for Measurements of Detrimental Intermetallic Phase in Duplex Steels

doi: 10.12338/j.issn.2096-9015.2021.0075
  • Available Online: 2021-08-18
  • Publish Date: 2021-11-01
  • The influence of detrimental intermetallic phase in duplex steels on their toughness and corrosion resistance can be detected by the ASTM A923-2014 standard ferric chloride corrosion test method, with the value characterized by corrosion rate. This paper analyzes the uncertainties due to the weight, length, width and thickness of the samples before and after the corrosion. The uncertainty components were calculated and then combined to obtain the expanded uncertainty. Taking into account the expanded uncertainty and other factors, the upper limit of the acceptance criteria for the test method was chosen. In order to eliminate the detrimental intermetallic phase and finally improve the product quality, proper heat treatment is needed on the samples exceeding the upper limit. The results showed that the detrimental intermetallic phase of 2205 duplex stainless steel was (3.9±1.4) mg/(dm2·d), with a coverage factor k=2. The upper limit of the acceptance criteria for this test method was chosen to be 8 mg/(dm2·d).
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