Stress Corrosion Behavior of AISI4340 High Strength Steel in High Temperature Water Containing Oxygen and/or Cl<sup>-</sup>

MA Tao; ZHANG Xiaofei; HUA Xiaochun; ZHAO Li; RAO Sixian

doi:10.11973/jxgccl202102003

Materials and Mechanical Engineering > 2021 > 45(2): 15-19,60. > DOI: 10.11973/jxgccl202102003

MA Tao, ZHANG Xiaofei, HUA Xiaochun, ZHAO Li, RAO Sixian. Stress Corrosion Behavior of AISI4340 High Strength Steel in High Temperature Water Containing Oxygen and/or Cl^-[J]. Materials and Mechanical Engineering, 2021, 45(2): 15-19,60. DOI: 10.11973/jxgccl202102003

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Stress Corrosion Behavior of AISI4340 High Strength Steel in High Temperature Water Containing Oxygen and/or Cl^-

1. School of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, China;
2 Hefei General Machinery Research Institute, Hefei 230031, China

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Received Date: February 11, 2020
Revised Date: October 18, 2020

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Abstract

Slow tensile stress corrosion tests and stress corrosion crack growth tests were used to study the stress corrosion behavior of AISI4340 steel in water at 100 ℃ containing saturated oxygen and/or 0.1 mol·L^-1 Cl^-. The results show that the presence of oxygen or Cl^- in water at 100 ℃ could increase the stress corrosion tendency of AISI4340 steel. The stress corrosion tendency in deoxygenated 100 ℃ water containing Cl^- was not significant, and the slow tensile fracture retained some ductile fracture characteristics; complete brittle fracture of AISI4340 steel occurred in the high temperature water containing saturated oxygen, and the stress corrosion tendency was significant. Oxygen or Cl^- could increase the stress corrosion crack growth rate of AISI4340 steel in water at 100 ℃. There was an interaction between oxygen and Cl^-, so their co-existence significantly increased the stress corrosion tendency and caused rapid crack growth after cracking.
- AISI4340 high strength steel,
- saturated oxygen,
- Cl^-,
- crack growth rate,
- stress corrosion

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Stress Corrosion Behavior of AISI4340 High Strength Steel in High Temperature Water Containing Oxygen and/or Cl-

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Stress Corrosion Behavior of AISI4340 High Strength Steel in High Temperature Water Containing Oxygen and/or Cl^-