XIONG Ronggang
,
FU Renyu
,
SU Yu
,
LI Qian
,
WEI Xicheng
,
LI Lin
钢铁研究学报(英文版)
Tensile tests of TWIP steels of two compositions are performed in the strain rate range of 10-5-103 s-1. Results indicate that steel 1# does not exhibit TWIP effect but deformationinduced martensitic transformation appears only. There exists TWIP effect in steel 3#. Tensile properties at room temperature are sensitive to strain rate in the studied strain rate ranges. Analysis on the relationship between strainhardening exponent and strain rates shows that straininduced martensitic transformation and formation of twins during deformation have significant influence on their strainhardening behavior.
关键词:
twininduced plasticity;strain rate;strainhardening;deformation twin
ZHANG Mei
,
LI Lin
,
FU Renyu
,
ZHANG Jicheng
,
WAN Zi
钢铁研究学报(英文版)
Transformation induced plasticity (TRIP) steel exhibited high or rather high carbon equivalent (CE) because of its chemical composition, which was a particularly detrimental factor affecting weldability of steels. Thus the weldability of a TRIP steel (grade 600) containing (in mass percent, %) 011C119Si167Mn was extensively studied. The mechanical properties and impact toughness of butt joint, the welding crack susceptibility of weld and heat affected zone (HAZ) for tee joint, control thermal severity (CTS) of the welded joint, and Y shape 60° butt joint were measured after the gas metal arc welding (GMAW) test. The tensile strength of the weld was higher than 700 MPa. Both in the fusion zone (FZ) and HAZ for butt joint, the impact toughness was much higher than 27 J, either at room temperature or at -20 ℃, indicating good low temperature impact ductility of the weld of TRIP 600 steel. In addition, welding crack susceptibility tests revealed that weldments were free of surface crack and other imperfection. All experimental results of this steel showed fairly good weldability. For application, the crossmember in automobile made of this steel exhibited excellent weldability, and fatigue and durability tests were also accomplished for crossmember assembly.
关键词:
TRIP steel;weldability;welding crack susceptibility;mechanical property;impact toughness
