摘要
采用热膨胀的方法测定了钢制安全壳用钢SA738Gr.B在不同冷却速度下的组织转变,采用GLEEBLE-2000试验机模拟分析了焊接参数对热影响区组织及冲击韧性的影响,进行了实际焊接,验证了与实际组织的相一致性.结果表明,随冷却速度的降低,SA738Gr.B钢板先后发生贝氏体转变、先共析铁素体析出及先共析铁素体+珠光体组织的转变.多层多道焊时,实际热影响区组织以混合组织为主,其基体组织基本符合同冷却速度条件下的热模拟组织,具有较高的抗裂性能.研究结果对生产实践具有较好的参考和指导作用.
The microstructure transfers were monitored by the expansion tests at the different cooling rates. By using the Gleeble-2000 thermal simulation machine,the impact toughness and the microstructures for the HAZ were also simulated. Furthermore,the weldments were performed to testify the consistency of the simulation specimen and the weldments. The results manifest that with the cooling velocity decreased,the Bainite transfer,the proeutectoid ferrite transfer,and proeutectoid ferrite pearite transfer take place in sequence. Accordingly the mechanical properties decreased. Under the condition of the multipass welds,the HAZ microstructures of the weldments consist of the mixed microstructure,but the base microstructures are same to that of the thermal simulations at the same cooing rate. The research results have a good direction and references to the welding fabrication.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第8期91-94,117,共6页
Transactions of The China Welding Institution
