摘要
以Fe-18Mn-0.6C和Fe-18Mn-0.6C-7Cr-0.2N孪晶诱发塑性(Twinning-induced plasticity,TWIP)钢为研究对象,利用动态充氢慢拉伸试验、升温脱氢分析及OM、XRD、EBSD等检测手段,研究了Cr、N元素对TWIP钢氢脆行为的影响。结果表明:Cr、N的添加能够细化Fe-18Mn-0.6C TWIP钢的晶粒尺寸,通过减少单位体积晶界上H原子的数量,降低应力集中,有效提高TWIP钢的抗氢脆性能;Cr、N的加入能够增加TWIP钢层错能,抑制形变孪晶的产生,减少一次孪晶与二次孪晶的交互作用,减少应力集中以及H原子的聚集,抑制氢致裂纹的萌生;Fe-18Mn-0.6C钢的断口形貌表现出准解理断裂特征,主裂纹大且深,沿孪晶扩展呈现穿晶断裂。Fe-18Mn-0.6C-7Cr-0.2N钢断口形貌的准解理断裂特征减少,主裂纹小而浅呈现沿晶断裂。
Effects of Cr and N elements on hydrogen embrittlement behavior of twinning-induced plasticity(TWIP)steels Fe-18Mn-0.6C and Fe-18Mn-0.6C-7Cr-0.2N were studied by means of dynamic hydrogen charging slow tensile test,thermal desorption analysis(TDA),as well as characterization techniques including optical microscope(OM),X-ray diffractometer(XRD)and electron backscatter diffraction(EBSD).The results show that the addition of Cr and N can refine the grain size of the Fe-18Mn-0.6C TWIP steel.By reducing the number of H atoms at grain boundaries per unit volume,stress concentration alleviates and the hydrogen embrittlement resistance of the TWIP steel effectively improves.The addition of Cr and N can increase the stacking fault energy of the TWIP steel,inhibit the formation of deformation twins,reduce the interaction between primary twins and secondary twins,decrease stress concentration and H atom aggregation,thus suppressing the initiation of hydrogen-induced cracks.The fracture morphology of the Fe-18Mn-0.6C steel exhibits quasi-cleavage fracture characteristics,with large and deep main cracks extending along twins,showing transgranular fracture.The Fe-18Mn-0.6C-7Cr-0.2N steel has reduced quasi-cleavage fracture characteristics in its fracture morphology,with small and shallow main cracks,showing intergranular fracture.
作者
黄玖龙
葛银磊
刘帅
周景一
徐海
袁泽博
冯运莉
Huang Jiulong;Ge Yinlei;Liu Shuai;Zhou Jingyi;Xu Hai;Yuan Zebo;Feng Yunli(College of Metallurgy and Energy,North China University and Technology,Tangshan Hebei 063210,China;Manufacturing Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan Hebei 063210,China)
出处
《金属热处理》
北大核心
2025年第12期232-238,共7页
Heat Treatment of Metals
基金
河北省创新能力提升计划项目(24461002D)
河北中央引导地方资助项目(236Z1014G)
唐山市科技局资助项目(23130206E)
河北省教育厅科技项目(QN2025168)
华北理工大学重点科研项目(ZD-ST-202310-23)。
关键词
孪晶诱发塑性钢
氢脆
Cr/N合金化
断口形貌
twinning-induced plasticity steel
hydrogen embrittlement
Cr/N alloying
fracture morphology
