DING Hua
,
LI Hua-ying
,
DING Hao
,
QIU Chun-lin
,
TANG Zheng-you
钢铁研究学报(英文版)
Two steels without and with Nb addition were chosen to investigate the effects of Nb on the microstructures and the mechanical properties of Fe-Mn-Al-Si steels. The results revealed that Nb refined the grains markedly and both TRIP and TWIP effects occurred during deformation process. The Nb containing steel possesses higher yield strength and much lower tensile strength, the latter being explained by the suppression of TRIP effect due to the increase of stacking fault energy. This indicates grain refining is secondary for strengthening of steels when TRIP or TWIP effect exists during the deformation of low carbon and high Mn steels.
关键词:
grain size
,
strength
,
high Mn steel
,
Nb
沈奎
,
卢立华
,
廖舒纶
,
麻晗
材料热处理学报
对铌钒微合金化高碳钢的奥氏体晶粒尺寸、连续冷却转变动态曲线(CCT图)以及等温转变曲线(TTT图)进行了测定,研究加热温度、冷却速度和保温温度对组织性能的影响.结果表明:实际生产中,应将加热温度控制在1100℃以下,避免奥氏体晶粒的粗化;相变前冷速控制在8 K/s以上,相变温度为620 ～650℃,相变温度区间内冷速控制在1.0～2.5 K/s,可获得均匀的索氏体组织和较好的性能.
关键词:
晶粒度
,
热模拟
,
控制冷却
,
显微组织
