10Ni8CrMoV钢的冷裂纹敏感性分析  

Analysis on welding cold crack sensibility of 10Ni8CrMoV steel

作　　者：杜义[1] 张田宏[1] 张俊旭[1] 

机构地区：[1]洛阳船舶材料研究所,河南洛阳471039

出　　处：《焊接学报》2006年第12期93-96,共4页Transactions of The China Welding Institution

摘　　要：通过插销试验方法对10Ni8CrMoV高强钢的冷裂纹敏感性进行了分析。通过在不预热、预热100℃、预热150℃和预热150℃并后热200℃×2 h四种焊接工艺条件下测定其插销临界断裂应力和焊接热循环参数,并对插销断口进行扫描电镜观察,综合分析了该钢的焊接冷裂纹敏感性。结果表明,随着预热温度的提高,10Ni8CrMoV钢插销临界断裂应力不断增大,韧窝状断口在整个断裂面上的比例增大,最后断裂形式有从沿晶→穿晶→韧性断裂转变的趋势,这说明10Ni8CrMoV钢对焊接冷裂纹有较强的敏感性,通过预热及焊后后热处理能明显改善该钢的焊接性。By using implant test,cold cracking sensibility of 10Ni8CrMoV high strength steel was analysed.At four welding conditions of non-preheating,preheating at 100 ℃,preheating at 150 ℃ and preheating at 150 ℃ then postheating 200 ℃×2 h,the critical rupture stresses of implant test and the welding thermal cycling parameters were measured,and the fracture appearance were observed by scanning electron microscope.By all these,the welding cold crack sensibility of 10Ni8CrMoV steel was analysed comprehensively.The results showed that with the preheat temperature being increased,the critical ruptrue stresses of implant test are higher,and the areas of dimple are relatively increasing in fracture surfaces,and the rupture tendency is displayed from intergranular crack to transgranular crack to ductile rupture.10Ni8CrMoV steel possesses a high cold cracking sensibility.Preheat and postheat treatment technologies can obviously improve the weldability of 10Ni8CrMoV steel.

关 键 词：10Ni8CrMoV钢 插销试验 冷裂纹敏感性 临界断裂应力 

分 类 号：TG406[金属学及工艺—焊接]