Determination of Internal Stresses During Pearlite Transformation of 0.8c–1.5Mn Steel Through 
<i>In-Situ</i> Neutron Diffraction

In this study, in-situ neutron diffraction during pearlite transformation and isothermal holding at 873 K after cooling of a 0.8C–1.5Mn steel specimen from 1323 K were conducted to measure the transformation stresses related to a eutectoid transformation. The stress relaxation behavior in cementite was also monitored to elucidate the relaxation of transformation elastic strains during isothermal annealing after pearlite transformation. By referring to the stress-free lattice parameter of an extracted electrolytic single-phase cementite sample after the long-time isothermal holding at 873 K, the transformation stresses were successfully evaluated. As one of the main findings, the elastic volume strain in cementite was determined to be approximately − 0.362%.

Keywords: Pearlite transformation, Eutectoid steel, Neutron diffraction, Stress relaxation, Elastic volume strain

Suggested Citation: Suggested Citation

Morooka, Satoshi and Nakada, Nobuo and Tsukada, Yuhki and Gong, Wu and Kawasaki, Takuro and Harjo, Stefanus, Determination of Internal Stresses During Pearlite Transformation of 0.8c–1.5Mn Steel Through In-Situ Neutron Diffraction. Available at SSRN: https://ssrn.com/abstract=3708734 or http://dx.doi.org/10.2139/ssrn.3708734