摘要
通过加入不同含量的稀土Ce,研究了稀土Ce对BT80s-5Cr油井管钢组织及第二相析出的影响。采用金相显微镜对淬火后原奥氏体晶粒度进行了分析;利用SEM、XRD、TEM对热处理后的微观组织和第二相进行了观察及分析。结果表明,试验钢经900℃保温50 min水淬后,随着稀土Ce含量从0增加至0.012%,原始奥氏体晶粒平均尺寸由14.21μm下降到了11.06μm,稀土Ce含量为0.0025%时,晶粒分布最为均匀,且6~15μm范围内的晶粒占比60.26%。稀土加入后细化了原奥氏体晶粒,并使组织更为均匀。淬火钢经690℃回火90 min后组织为回火索氏体+回火托氏体的混合组织。随着稀土Ce含量从0增加至0.012%,碳化物析出量减少,稀土的加入抑制了碳化物的析出;碳化物的类型主要为Cr_(23)C_(6)、Cr_(7)C_(3),稀土Ce的加入不改变碳化物的类型;Ce含量为0.012%时,碳化物在晶界处由连续分布转变为断续的团簇分布。
Effect of rare earth Ce on microstructure and second phase precipitation of BT80s-5Cr oil well pipe steel was studied by adding different contents of rare earth Ce.The prior austenite grain size after quenching was analyzed by using metallographic microscope.The microstructure and second phase after heat treatment were observed and analyzed by using SEM,XRD and TEM.The results show that after water quenching at 900℃for 50 min,when the rare earth Ce content of the tested steel increases from 0 to 0.012%,the average size of the prior austenite grains drops from 14.21μm to 11.06μm,and when rare earth Ce content is 0.0025%,the grain distribution is the most uniform,and the proportion of grains within the range of 6-15μm is 60.26%.The addition of rare earth refines the prior austenite grains and makes the structure more uniform.After tempering at 690℃for 90 min,the microstructure of the quenched steel is a mixed structure of tempered sorbite and tempered troostite.As the content of rare earth Ce increases from 0 to 0.012%,the amount of carbide precipitation decreases,and the addition of rare earth inhibits the precipitation of carbide.The main types of carbides are Cr_(23)C_(6)and Cr_(7)C_(3),and the addition of rare earth Ce does not change the type of carbides.When the Ce content is 0.012%,the carbides undergo a transition from continuous distribution to intermittent cluster distribution on grain boundaries.
作者
韩强
许涛
李涛
贾欣
孙昭琦
白岩松
Han Qiang;Xu Tao;Li Tao;Jia Xin;Sun Zhaoqi;Bai Yansong(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China;Department of Engineering Equipment of Baosteel Group Co.,Ltd.,Baotou Inner Mongolia 014010,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第8期24-29,共6页
Heat Treatment of Metals
基金
内蒙古自治区科技计划(2020GG0207)
内蒙古自然科学基金(2021LHMS05028)。
