张凌义
,
杨钢
,
黄崇湘
,
陈为亮
,
王立民
金属学报
研究了热轧态1Cr16Co5Ni2MoWVNbN马氏体耐热钢经一道次等径角挤压(ECAP)变形+680℃2 h空冷处理后的微观结构和力学性能. 结果表明: 经ECAP变形后, 马氏体板条大部分已碎化成亚晶粒和位错胞, 第二相纳米粒子(M23C6)分布更弥散均匀; 经随后的退火处理, 发生了回复和部分再结晶, 位错密度有所降低, 形成大量尺寸仅几百纳米的等轴亚晶粒. ECAP变形后材料的屈服强度有很大提高(提高至1400 MPa), 但延伸率和静力韧度均大幅度下降(分别降至7.3%和100 MJ/m3); 随后的退火处理可恢复其塑性(15.4%), 其强度(1044 MPa)和静力韧度(181.6 MJ/m3)均较初始态(922 MPa, 160.7 MJ/m3)高.
关键词:
耐热钢
,
Equal Channel Angular Pressing (ECAP)
,
Strength
,
Plasticity
Zhenli MI
,
Di TANG
,
Ling YAN
,
Jin GUO
材料科学技术（英文）
In this paper new high-strength and high-plasticity twinning induced plasticity (TWIP) steel for modern automobile body was investigated. Some basic experimental results were given. The results indicate the TWIP steel has excellent properties. It exhibits high ultimate tensile strength (600~1100 MPa) and extremely large elongation of 60% to 90%. In the future it would be capable of satisfying the requirements of new generation of vehicle.
关键词:
TWIP steel
,
null
,
null
