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研究了一种用于汽车车体的高强、高塑性中C-高Mn系孪晶诱发塑性(TWIP)钢,有助于达到汽车减排、节能和安全的目的。通过单向拉伸实验和OM观察,分析研究了水淬工艺对TWIP钢的力学性能和微观组织的影响规律,采用SEM和TEM对不同变形程度TWIP钢的精细结构进行了分析。结果表明,随着水淬温度的提高,退火孪晶体积分数和晶粒尺寸增大,塑性、加工硬化性提高,而试件的强度和屈强比降低,可以获得抗拉强度960 MPa,延伸率60.5%,具有优异的综合力学性能(强塑积最高达6.096×10~4 MPa%)的试件;具有大量退火孪晶的奥氏体在变形过程中产生大量的形变孪晶,提高了TWIP钢的强度和塑性。
A high-strength, high-plasticity C-high Mn twin twin induced plasticity (TWIP) steel for automotive bodywork was studied to help reduce emissions, conserve energy and improve safety. Through uniaxial tensile test and OM observation, the influence of water quenching process on the mechanical properties and microstructure of TWIP steel was analyzed. The fine structure of TWIP steel with different deformation degree was analyzed by SEM and TEM. The results show that with the increase of water quenching temperature, the volume fraction of twins and the grain size increase, the plasticity and work hardening increase, while the strength and yield ratio of the specimens decrease. The tensile strength is 960 MPa and the elongation Rate of 60.5%, with excellent mechanical properties (high plastic product up to 6.096 × 10 ~ 4 MPa%) of the specimen; with a large number of annealing twins austenite deformation during the deformation produced a large number of twins, increased TWIP steel strength and plasticity.