Effect of Rare Earth Element Ce on Nanoscale (Ti, Nb) C Precipitates and Mechanical Properties of High-Strength Low-Alloy Weathering Steel
Yunlong Wang, Rui Zhu, Hairui Ma, Guohua Ding, Limeng Liang, Weiwei Sun, Yongxia Wang
TL;DR
Adding cerium to weathering steel changes nanoscale precipitates and mechanical properties, affecting strength and deformation behavior.
Contribution
The study reveals how Ce modifies nanoscale precipitates and inclusion behavior in weathering steel, impacting mechanical performance.
Findings
Ce addition promotes coarsening of nanoscale precipitates, reducing their strengthening effect.
Ce refines inclusion size and modifies inclusion types, aiding steel purification.
A high-strength weathering steel with 635 MPa yield strength was fabricated using Ce-modified precipitates.
Abstract
This study investigates the influence of rare earth element Ce addition on the nanoscale precipitation, microstructure, and mechanical properties of Ti-containing secondary phases in high-strength low-alloy weathering steel. Mechanical property testing and microstructural characterization were performed on experimental samples subjected to rolling-aging treatment. The results demonstrate that the addition of Ce promotes coarsening of nanoscale precipitates, thereby diminishing their precipitation strengthening effect. At a 0.11% Ce content, an increase in inclusions was observed, leading to crack formation during hot deformation. However, Ce addition also refines inclusion size and modifies inclusion types, contributing to steel purification. Through austenite recrystallization zone rolling combined with an isothermal process, a high-strength ferritic weathering steel with nanoscale…
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Taxonomy
TopicsMicrostructure and Mechanical Properties of Steels · Hydrogen embrittlement and corrosion behaviors in metals · Metal Alloys Wear and Properties