Effect of cooling rate on microstructure and crystallographic characters for Fe3O4 seam-free on J82B steel from 650°C
作者机构：State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Jiugang Hongxing Iron & Steel Co.Ltd. State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2023年第33卷第5期
页 面：718-732页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0701[理学-数学]
基 金：the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB0470303) the financial support from the National Natural Science Foundation of China(No. 52072380 and No. 51575505) Jiugang Hongxing Iron&Steel Co.,Ltd.(No. 4500624997)
主 题：High carbon steel wire 3500 gleeble thermal simulator Cooling rate Fe_3O_4 seam layer Matrix microstructure EBSD
摘 要：Surface quality and tensile strength are required for the deep processing yield of high-carbon steel wires,particularly those with a cumulative reduction rate above 60 %. A systematic investigation was conducted to discern the influence mechanism of cooling rate on microstructure and crystallographic characteristics for the matrix from 650°C. The results show that the microstructure of the sample cooled at 1.5°C/s consists of a single pearlite, and the grain orientation is mainly the easy sliding crystal plane {101}. The retained austenite/martensite microstructure appears and grows with the cooling rate increasing to 4.5 and 7.5°C/s. The grain orientation shifts from an easy slip {101} plane orientation to hard slip {001} and {111} plane orientations. The number of high-angle grain boundaries that inhibit crack expansion decreased. In addition, the number of twin boundaries in the austenite/martensite grains increased. An increase in the cooling rate increased the material hardness and decreased the plastic toughness. Therefore, the cooling rate of 1.5°C/s from 650°C might concurrently yield the optimal surface quality and the microstructure of the matrix during steel production.
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