Investigation of Solidification of High Strength Steel.
Interim rept. 1 Jan-31 Dec 70,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE
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The effects of high temperature homogenization on sulfide inclusions were studied in unidirectionally solidified low alloy steel ingots containing Type II, Type III, and a mixed Type II-III sulfide inclusions. Specimens were taken at various distances from the chill and were heat-treated at 1315C 2400F in vacuum and homogenized for various times between 20 and 100 hrs. Type II and mixed Type II-III sulfide inclusions coalesced to compact polyhedral shapes during homogenization. These more compact shpaes should be much less deleterious to mechanical properties than the original Type II and II-III inclusions. Microporosity was studied in unidrectionally solidified low alloy steel using X-ray microradiography and optical metallography. Author
- Metallurgy and Metallography