Effects of acicular ferrites on crystallography and incomplete transformation of low-carbon low-alloy steel

被引：2
|
作者：
Wu, Binbin [1 ,2 ,3 ]
Wang, Zhiquan [4 ]
Shang, Chengjia [2 ,5 ]
Yang, Zhigang [3 ]
Zhang, Chi [3 ]
Elhefnawey, Maged [6 ]
Li, Li [1 ]
机构：
[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150000, Peoples R China
[2] Yangjiang Branch, Guangdong Lab Mat Sci & Technol, Yangjiang Adv Alloys Lab, Yangjiang 529500, Peoples R China
[3] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Minist Educ, Beijing 100084, Peoples R China
[4] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China
[5] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[6] Kafrelsheikh Univ, Fac Engn, Dept Mech Engn, Kafrelsheikh 33516, Egypt
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 30卷
关键词：
Low-carbon low-alloy steel; Acicular ferrite; M/A islands; Crystallography; Incomplete transformation; HEAT-AFFECTED ZONE; MARTENSITE-AUSTENITE CONSTITUENT; BAINITE FORMATION KINETICS; IMPACT TOUGHNESS; AUTOCATALYTIC NUCLEATION; PIPELINE STEEL; COOLING RATE; MICROSTRUCTURE; STRENGTH; HAZ;
D O I：
10.1016/j.jmrt.2024.03.194
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, we investigated the effects of acicular ferrite (AF) on the crystallographic and incomplete transformation characteristics of low-carbon low-alloy steel. Intermediate annealing after austenitization induced a transformation yielding AFs, accelerating the isothermal transformation kinetics and regulating the microstructure. This process formed highly dense packet grain boundaries and improved the stability of untransformed austenite. AF formation increased the number of packet interfaces, increasing the crack propagation energy. The reduction and refinement of martensite/austenite (M/A) islands increased the crack nucleation energy. A displacive model was used to fit the transformation kinetics curve, indicating the significant effect of the nucleation rate on the isothermal transformation of the experimental steel at 450, 475, and 500 degrees C. The findings of this study indicate that nucleation regulation can accelerate transformation kinetics to strengthen and toughen bainitic structures.
引用
收藏
页码：1572 / 1581
页数：10
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