摘要
通过光镜、透射电镜、背散射电子衍射技术(EBSD)、拉伸与(-20℃)冲击试验,研究了不同终冷温度对X100管线钢组织、性能的影响规律。结果表明,随终冷温度降低,针状铁素体(AF)、粒状贝氏体(GB)组织逐渐减少,板条贝氏体含量逐渐增加,钢板强度增高,塑韧性降低,当终冷温度在380℃左右时,少量AF、GB组织分割原奥氏体晶粒,板条贝氏体束的有效晶粒尺寸得到细化,钢板具有最优的综合力学性能,屈服强度为775 MPa,抗拉强度为855 MPa,伸长率为16.6%,-20℃冲击功为218 J,各项性能指标均满足X100管线钢的要求。
By the anylsis of OM, TEM, EBSD ,tension and （-20℃）impact test ,the effects of the final cooling temperature on microstructure and mechanical properties of X100 linepipe steel were studied at laboratory. The results show that the content of AF （acicular ferrite） and GB （grained bainite） is reducing, the content of lath bainite and the strength（σb, σs） is increasing, the elongation（δ） and impact value（AKV） decrease with the decrease of the final cooling temperature. The final cooling temperature of the test steel produced at about 380℃ has excellent integrated mechanical properties, The （σb, σs, δ and A KV （-20℃） is up to 845 MPa ,775 MPa, 16.6% and 218 J, respectively, every property test index of the test steel all accords with the requirements of X100 linepipe steel.
出处
《热加工工艺》
CSCD
北大核心
2007年第14期21-23,26,共4页
Hot Working Technology
作者简介
王路兵（1977-），男，河北人，博士研究生；电话：13810810728；E-mail：ustb_wlb@126．com
