In:
steel research international, Wiley, Vol. 93, No. 11 ( 2022-11)
Abstract:
Herein, the effect of Mg content on inclusions and microstructure of Ca‐La‐treated steel is investigated. Inclusions mainly consist of oxide cores, La‐containing parts, and sulfides in the final quenched samples. Oxide cores are Ca‐Al‐O in Mg‐free sample, whereas those in Mg‐bearing samples change from Mg‐Ca‐Al‐O and Mg‐Al‐O to MgO with the increasing Mg content. Increasing Mg content from 0 to 0.003%, the number density of inclusions increases while mean size decreases due to the formation of fine Mg‐containing inclusions. When Mg content is 0.0053%, the formation of sulfides (MgS and CaS) with high contact angle promotes the aggregation of inclusions, which results in the decrease of number density of inclusions and the increase of inclusions size. Effective inclusions are predominantly composed of oxide cores and MnS shells. A large amount of acicular ferrite (AF) is obtained in low and medium Mg content samples due to the formation of a mass of effective inclusions. High Mg content leads to the formation of MgS and CaS and suppresses the precipitation of MnS, which decreases the effectiveness of inclusions to induce the formation of AF.
Type of Medium:
Online Resource
ISSN:
1611-3683
,
1869-344X
DOI:
10.1002/srin.202200319
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2148555-0
SSG:
19,1
Permalink
