JIANG Hai-bing
,
ZHANG Jian-liang
,
FU Jian-xun
,
CHANG Jian
,
LI Jing
钢铁研究学报(英文版)
The properties of mixed coals were studied on the basis of known various properties of the injecting coals in the treatise. The structure of the injecting coals was optimized and put into practical application. It was found that the ignition point was lowered with mixed coals, however, both combustibility and grindability were improved, and explosibility of the mixed coals were decreased as well. Hence, mixed coals injection not only can improve the amount of the injecting coals greatly, but also improve the economical and technical indexes of the blast furnace.
关键词:
blast furnace
,
pulverized coal
,
property
,
injection
HAN Qihang
,
KANG Yonglin
,
ZHAO Xianmeng
,
L Chao
,
GAO Lufeng
钢铁研究学报(英文版)
Two kinds of ultrahigh strength cold rolled dual phase steels have been developed by designing CSiMnCr and CSiMnCrMo alloy systems. Tensile strength and elongation of both steels exceed 1100 MPa and 10%, respectively. The microstructures of both steels consist of massive martensite and ferrite. And the massive martensite of Mofree steel disperses in the ferrite with volume fraction of 64%. However, the massive martensite of Mocontaining steel is connected or closed by small martensite islands each other, and martensite volume fraction is 69%. As to Mofree steel, the yield strength, yield ratio, and work hardening exponent n are 548 MPa, 049, and 026, respectively. As for Mocontaining one, the yield strength, yield ratio, and n value are 746 MPa, 066, and 033, respectively. Besides, the ferrite of Mofree steel is deformed at the initial stage of plastic deformation. However, for Mocontaining one, Mo solution strengthened ferrite and small overaged martensite islands are deformed preferentially at small strain, which causes the yield strength to reach approximately 200 MPa higher than that of Mofree steel.
关键词:
Mo
,
dual phase steel
,
microstructure
,
property
,
deformation mechanism
LIU Yu-rong
,
YE Dong
,
YONG Qi-long
,
SU Jie
,
ZHAO Kun-yu
,
JIANG Wen
钢铁研究学报(英文版)
The microstructures and mechanical properties of Cr13 super martensitic stainless steel after different heat treatments were studied. The results show that the structures of the steel after quenching are of lath martensite mixed with a small amount of retained austenite. With the raising quenching temperature, the original austenite grain size increases and the lath martensite gradually becomes thicker. The structures of the tempered steel are mixtures of tempered martensite and reversed austenite dispersed in the martensite matrix. The amount of reversed austenite is from 754% to 2249%. After different heat treatments, the tensile strength, the elongation and the HRC hardness of the steel are in the range of 813-1070 MPa, 101%-212% and 2133-3237, respectively. The steel displays the best comprehensive mechanical properties after the sample is quenched at 1050 ℃ followed by tempering at 650 ℃.
关键词:
super martensitic stainless steel
,
quenching
,
tempering
,
structure
,
property
,
reversed austenite
赵捷
,
朱树行
,
王志奇
,
阎振
,
宁保群
,
包俊成
钢铁
对大规格SWRH82B高碳钢盘条自然时效后的力学性能变化规律进行了较为系统的研究；借助OM、SEM、EDS和XRD等对其显微组织、夹杂物成分与分布、宏观与微观断口形貌、物相结构和残余应力等进行测试与分析。结果表明，82B盘条的断面收缩率随时效时间延长明显升高。满足盘条力学性能所需的时效时间与初始性能和环境温度有关；盘条中的夹杂物分布不均，且存在尺寸较大的复合脆性夹杂物，导致出现“黑心+白点”特征的断口形貌；时效后残余应力的释放和晶格畸变的减小是引起盘条断面收缩率提高的主要原因。
关键词:
82B
,
wire rod
,
natural aging
,
microstructure
,
property
,
inclusion
,
residual stress
