SEDL / STP / STP857-EB / STP32751S

Fatigue Crack Propagation of 25Mn-5Cr-1Ni Austenitic Steel at Low Temperatures

Yokobori, T
Professor Emeritusprofessorresearch associatelecturersenior researcher, Tohoku UniversityXian Jiaotong UniversityTechnical Research Department at the Yawata Works of Nippon Steel Corp., SendaiXianYawata, Shaanxi

Maekawa, I
Professor Emeritusprofessorresearch associatelecturersenior researcher, Tohoku UniversityXian Jiaotong UniversityTechnical Research Department at the Yawata Works of Nippon Steel Corp., SendaiXianYawata, Shaanxi

Tanabe, Y
Professor Emeritusprofessorresearch associatelecturersenior researcher, Tohoku UniversityXian Jiaotong UniversityTechnical Research Department at the Yawata Works of Nippon Steel Corp., SendaiXianYawata, Shaanxi

Jin, Z
Professor Emeritusprofessorresearch associatelecturersenior researcher, Tohoku UniversityXian Jiaotong UniversityTechnical Research Department at the Yawata Works of Nippon Steel Corp., SendaiXianYawata, Shaanxi

Nishida, S-I
Professor Emeritusprofessorresearch associatelecturersenior researcher, Tohoku UniversityXian Jiaotong UniversityTechnical Research Department at the Yawata Works of Nippon Steel Corp., SendaiXianYawata, Shaanxi

Pages: 19    Published: Jan 1985

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Abstract

A study has been carried out on the fatigue behavior of a newly developed high-manganese steel intended for low-temperature applications in the range from 0 to −174°C. As-rolled and solution-treated high-managanese steel were tested. The fatigue behavior of commercial austenitic steel was also presented for comparison.

The fatigue life of high-manganese steel was found to increase with decreasing temperature from 0 to −174°C. Crack growth rates were expressed in terms of the Paris relation da/dN = C(ΔK)ⁿ, and the power coefficient n was shown to depend on temperature. The temperature dependence of crack growth rate and n, as well as the linear dependence of apparent activation energy of the fatigue crack growth rate on the logarithm of the stress intensity factor range, are explained by the dynamic theory of fatigue crack growth.

Fatigue fracture toughness (Kfc) was found to increase with decreasing temperature. The effect of welding on Kfc is also shown.