LIU Ji-yuan
,
ZHANG Zi-cheng
,
ZHU Fu-xian
,
LI Yan-mei
,
Manabe Ken-ichi
钢铁研究学报(英文版)
The controlled cooling technology following hot rolling process is a vital factor that affects the final microstructure and mechanical properties of the hot-rolled transformation induced plasticity (TRIP) steels. In the present study, low alloy C-Si-Mn TRIP steel was successfully fabricated by hot rolling process with a 450 hot rolling mill. To maximize the volume fraction and stability of retained austenite of the steel, two different cooling methods (air-cooling and ultra-fast cooling “AC-UFC” and ultra-fast cooling, air-cooling and ultra-fast cooling “UFC-AC-UFC”) were conducted. The effects of the cooling method on the microstructure of hot-rolled TRIP steel were investigated via optical microscope, transmission electron microscope and conversion electron Mssbauer spectroscope. The mechanical properties of the steel were also evaluated by conventional tensile test. The results indicated that ferrite and bainite in the microstructure were refined with the cooling method of UFC-AC-UFC. The morphology of retained austenite was also changed from small islands distributing in bainite district (obtained with AC-UFC) to granular shape locating at the triple junction of the ferrite grain boundaries (obtained with UFC-AC-UFC). As a result, the TRIP steel with a content of retained austenite of 1152%, total elongation of 32% and product of tensile strength and total elongation of 27552 MPa·% was obtained.
关键词:
hot-rolled TRIP steel
,
retained austenite
,
TRIP effect
,
Mssbauer spectra
,
mechanical property
梁峰
,
王佳
,
曹楚雨
,
林海潮
腐蚀学报（英文）
结合极化曲线的测量,考察了铁在除氧的不同pH值1N溴化钾溶液中的阳极溶解过程交流阻抗频谱特征,在所考察的pH值范图内,铁阳极溶解过程的塔菲尔斜率约为70mV/dec.。在较低极化电位下,pH值为4.0,2.0,1.3,0.6时,阻抗谱由一个低频感抗弧及一高频容抗弧组成;在较高极化电位下,且pH值为1.3,0.6时,阻抗谱仍为一个低频感抗弧及一高频容抗弧,pH值为2.0,4.0时,随极化电位升高,此时阻抗谱是由一个高频容抗及一低频容抗弧组成。分析了形成各种阻抗谱的原因。实验结果支持了Ken Nobe所提出的
关键词:
