氢对不锈钢电渣堆焊层塑韧性的影响  

Influence of Hydrogen on Ductility and Toughness of Stainless Steel Overlay Made by Electroslag Cladding

作　　者：刘航[1] 田志凌[1] 汪光胜[2] 姜治中 徐平[2] 孙永令 韩怀月[1] 丁国庆[1] 

机构地区：[1]钢铁研究总院,8室北京1000812 [2]金陵石化公司炼油厂,南京210033

出　　处：《钢铁研究学报》1999年第6期39-42,共4页Journal of Iron and Steel Research

基　　金：中国石油化工总公司科学技术研究开发项目

摘　　要：模拟加氢反应器的工作条件（ｐ＝ １７．５ ＭＰａ，ｔ＝ ４５０ ℃）对００Ｃｒ２０Ｎｉ１０Ｎｂ 电渣堆焊层充氢。结果表明，充氢导致堆焊层断裂韧性值减小、塑韧性显著降低。在面弯试验中，堆焊层由于充氢后脆化而发生小角度开裂，其面弯断口呈脆性准解理形态，并有较多的二次裂纹；面弯产生的显微裂纹沿δ／γ相界分布。据此认为充氢首先使δ／γ相界面脆化。充氢后的堆焊层经６３０ ℃×４ ｈ 去氢处理可消除氢脆现象，使塑韧性恢复。The hydrogen charging test in 00Cr20Ni10Nb steel overlay made by electroslag cladding was carried out with the hydrogen pressure of 17.5 MPa at the temperature of 450 ℃ to simulate the working condition in hydrogenating reactors. The results show that hydrogen charging in overlay decreases significantly its fracture toughness value, CTOD, as well as ductility and toughness. The hydrogen charging in overlay causes microcracking due to the hydrogen embrittlement during bending test. Fractographic appearance of bending specimen is quasi cleavage fracture and more secondary cracks. Those microcracks distribute along δ/γ phase boundaries. Therefore, the hydrogen charging in overlay results firstly in embrittlement around δ/γ phase boundaries. After dehydrogenation at 630 ℃ for 4 hours, the ductility and toughness of the overlay which was initially charged with hydrogen is recovered and hydrogen embrittlement is eliminated.

关 键 词：不锈钢 堆焊层 氢脆 电渣堆焊 加氢反应器 

分 类 号：TE966.04[石油与天然气工程—石油机械设备] TG455[金属学及工艺—焊接]