Abstract
Sometimes, case-hardening steel is very brittle after quenching, nevertheless its hardness is relatively low. The authors' experiment on the plain C, Cr-Mo and Ni-Cr case-hardening steel indicates that this brittleness is recognized when the steel which contains a mixed structure of ferrite and pearlite is quenched from a little higher temperature than A1 point, even in a rapid heating, and is lowered with increase of the quenching temperature up to A8 point, but a martensitie or sorbitic steel is not brittle after quenching from just above A1 point. From these results and microstructure observation of quenched specimens, it is concluded that this brittleness is caused by partial quenching which changes pearlite portion of the mixed structure into high-carbon martensite; that this high carbon martensite prohibits the deformation of ferrites; and that it is because of no high carbon martensite produced in the martensitic or sorbitic steel by quenching from all temperature ranges that such steel does not exhibit the brittleness.
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