摘要
利用拉伸试验机、扫描电镜、透射电镜以及X射线衍射分析了临界退火温度和临界退火时间对中锰钢的微观组织以及力学性能的影响。研究结果表明:在本文所设计工艺条件下,由于临界退火时间短导致组织中的渗碳体无法完全溶解,其微观组织主要由铁素体、残留奥氏体以及渗碳体所构成;试样在650~700℃之间退火能获得良好性能,但是不同临界退火温度出现良好力学性能所需要的时间不一样,温度越高,所需要时间越短;675℃退火5 min时有最佳的力学性能,抗拉强度约为980 MPa,断后伸长率约为30%,强塑积接近30 GPa·%。
Effects of intercritical annealing temperature and intercritical annealing time on microstructure and mechanical properties of a medium Mn TRIP steel were studied by means of tensile testing machine, scanning electronic microscopy （SEM） , transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The results show that the microstructure of the steel is mainly composed of ferrite, retained austenite and some of cementite, the cementite remained after critical annealing due to the short intercritical annealing time. The steel has good mechanical properties when the intercritical annealing temperature is between 650-700 ℃ , and with increasing of the annealing temperature from 650 to 700 ℃ , the annealing time required to achieve the optimal mechanical property is decreased. The optimal mechanical properties of the steel with tensile strength of 980 MPa, total elongation of 30% and product of strength and elongation of 30 GPa.% are obtained after annealing at 675 ℃ for 5 min.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第4期112-118,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51304120,51364033)
内蒙古自然科学基金(2015MS0556,2015MS0557)
关键词
连续退火
中锰TRIP钢
微观组织
力学性能
continuous annealing
medium Mn TRIP steel
microstructure
mechanical property
