摘要
针对硅锰钢履带板冲击韧性波动范围大、冲击韧性低这一生产中急待解决的问题 ,主要研究了硫化物夹杂对冲击性能的影响 ,发现硫化物的形态是影响冲击性能的主要因素 .当钢中硫化物形态以球形、多角形的Ⅰ、Ⅲ型为主时 ,钢的冲击性能良好 ;当钢中硫化物形态以长条链形、网状的Ⅱ型析出时 ,将会对钢的冲击韧性产生不利的影响 .硫化物的形态主要受钢中稀土残余含量的影响 ,当稀土残余含量w(Re) >0 0 4 %、残余稀土与S含量的比值w (Re) /w(S) >1 2 5时 ,方能保证钢中的硫化物形态为Ⅰ、Ⅲ型 .加入变质剂前的钢液原始O含量低 ,可得到高回收率的稀土残余含量 ,钢中的硫化物形态可以控制为Ⅰ、Ⅲ型 ;加入变质剂后的钢液原始O含量高 ,稀土回收率低 。
Effect of sulfide morphologies on toughness of Si?Mn steel is studied. The results show that superior toughness of the steel is maintained while sulfide in the steel appears as sphere type Ⅰ or block type Ⅲ. As the sulfide is of type Ⅱ, the shape of which is trip chain or reticulation, it is of no advantage to the toughness of steel. The main factor influencing the type of sulfide is the residue content of rare earth (Re) in the steel. The sulfide type Ⅰ or type Ⅲ will be obtained, if w (Re)>0 04% (mass fraction )and w (Re)/ w (S)>1 25. While the oxygen content in the steel liquid is low before adding rare earth as the modifying agent, the w (Re) and w (Re)/ w (S) in the steel will be high such that the sulfide type Ⅰ or type Ⅲ will be obtained. Otherwise, only the sulfide type Ⅱ will be obtained.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2000年第3期74-77,共4页
Journal of Xi'an Jiaotong University
