Nb-Ti微合金碳氮化物析出行为及微合金钢性能研究  

Study on performance of carbonitride precipitation and properties in Nb-Ti microalloyed steels

作　　者：徐乃龙[1] 王利[2] 洪继要[2] 金学军[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]宝钢集团中央研究院,上海201900

出　　处：《锻压技术》2014年第5期121-126,共6页Forging & Stamping Technology

摘　　要：对含Nh、Ti的微合金钢进行模拟卷曲和连续退火处理，采用金相及透射电子显微镜观察，深入研究微合金元素碳氮化物在铁素体相中的析出行为及退火后钢的性能变化。研究结果表明，微合金碳氮化物会在600～700℃时从铁素体中大量析出，析出物呈方形，大小为几十到一百纳米不等，为复杂的（Nb，Ti）（C，N）复合物；经过800℃左右的连续退火处理后析出物数量减少，体积变小；钢在800℃左右的连续退火处理后的组织为铁素体和团絮状的渗碳体，随着退火温度的升高，钢的屈服强度降低，伸长率升高。The simulated curling and continuous annealing for microalloyed steels contained Nb and Ti were conducted, and the precipita- tion behavior of microalloyed carbonitrides in ferrite phase and the mechanical properties of steel after annealing were deeply investigated by using a combined technique of metallographic analysis and transmission electron microscopy （TEM）. The results show that the carbo- nitrides precipitate out from ferrite phase heavily between 600 and 700℃, which is a kind of complex （ Nb, Ti） （ C, N） with square shape and size from 10 to 100 nm. The precipitation quantity becomes fewer and the volume is smaller after continuous annealing at temperature about 800℃. The microstructure is ferrite and flocculent cementite after continuous annealing at temperature about 800℃, and the yield strength decreases, while the elongation increases with annealing temperature increasing.

关 键 词：Nb—Ti微合金钢 碳氮化物 卷曲 退火 

分 类 号：TG142.33[一般工业技术—材料科学与工程]