摘要
采用混合气体保护焊,在13kJ·cm-1热输入下对3种不同钼、硼含量的800MPa级钛铌析出强化高强钢进行焊接试验,并对焊接接头的组织、强度及硬度进行研究。结果表明:低钼含量高强钢存在热影响区软化现象;随着淬透性元素钼和硼的添加,焊接热影响区的硬度增大,抗拉强度由720 MPa分别增至760 MPa和795 MPa;钼和硼元素的添加对(Ti,Nb,Mo)(C,N)第二相粒子在热影响区的行为没有显著影响。
Three kinds of 800 MPa high strength steels with Ti and Nb precipitation strengthening and containing different Mo and B contents were weld under the conditions of mixed gas arc welding and heat input of13kJ·cm-1,and the microstructure,strength and hardness of the welded joints were studied.The results show that the heat affected zone（HAZ）of the high strength steel with lower Mo was found softening.With the increasing of Mo and B,which increased the hardenability characteristic,the hardness of HAZ increased and the tensile strength increased from 720 MPa to 760 MPa and 795 MPa,respectively.Adding Mo and B elements had no obvious affection on the behavior of second phase particle（Ti,Nb,Mo）（C,N）in HAZ.
出处
《机械工程材料》
CAS
CSCD
北大核心
2014年第11期21-25,共5页
Materials For Mechanical Engineering
关键词
钛铌析出强化
高强钢
接头强度
HAZ硬度
第二相粒子
precipitation strengthing with Ti and Nb
high strength steel
strength of welded joint
hardness of HAZ
second phase particle
