中南大学学报（自然科学版）2018，Vol.49Issue(3)：518-528,11.DOI:10.11817/j.issn.1672-7207.2018.03.002
DH36高强度船板钢中碳化物及碳氮化物析出行为
Precipitation behaviors of carbides and carbonitrides in DH36 high-strength ship plate steel
摘要
Abstract
To study the precipitation of nano-sized carbides and carbonitrides in technical grade DH36 high-strength ship plate steel during the thermomechanical controlled processes (TMCP), carbon replications of DH36 were explored through a transmission electron microscopy. And the precipitation of carbides and nitrides during the cooling process was further investigated thermodynamically. The results show that the common precipitated phases in steels are (Nb,Ti)C carbides and (Nb,Ti)(C,N) carbonitrides, both of which are face-centered cubic of NaCl structure. The (Nb,Ti)(C,N) carbonitrides are mostly cubic, and the (Nb,Ti)C carbides are mainly constituted by Ti rich core part and Nb rich cap part. The precipitates are single phase, and the lattice constant transforms slightly with the alteration of molar ratio of Ti to Nb. Through the statistics of particle size and distribution, a calculation based on Orowan mechanism shows that the precipitation hardening offers 166 MPa yielding strength increase. The precipitation sequence is as follows: TiN, TiC, NbC, NbN.关键词
DH36/碳化物/碳氮化物/沉淀强化/析出热力学Key words
DH36/carbides/carbonitrides/precipitation hardening/precipitation thermodynamic分类
矿业与冶金引用本文复制引用
石骁,吴建中,郭汉杰,郭靖,段生朝,杨文晟..DH36高强度船板钢中碳化物及碳氮化物析出行为[J].中南大学学报（自然科学版）,2018,49(3):518-528,11.基金项目
国家自然科学基金资助项目(U1560203,51274031) (Projects(U1560203, 51274031) supported by the National Natural Science Foundation of China) （U1560203,51274031）
