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通过透射电镜观察了低氮低钒D36船板钢的析出相特征,并讨论了其沉淀强化作用。结果表明:实验用钢的组织均为铁素体-珠光体组织,珠光体中未见析出相,仅在铁素体中观察到析出相。VCx析出相为矩形片状形貌,在铁素体基体上均匀弥散沉淀,析出相以{100}α-Fe为惯习面,与基体存在Baker-Nutting取向关系;少量球状V6C5析出相(单斜结构)与铁素体基体存在一定取向关系,可能是共格VCx相通过碳原子重新分布转变而成。低氮低钒钢中加入0.05%V,沉淀强化值约为63 MPa,加入微量铌后在铁素体内形成一定密度的位错能有效发挥钒的沉淀强化作用。
Transmission electron microscopy (TEM) was used to observe the precipitation characteristics of D36 low-nitrogen and vanadium-bearing steel. The precipitation strengthening effect was also discussed. The results show that the microstructure of the experimental steel is ferrite-pearlite. No precipitates are found in the pearlite. Precipitates are only observed in the ferrite. The precipitated phase of VCx was uniformly distributed by precipitation on the ferrite matrix. The precipitated phase was {100} α-Fe as the habitus surface, and there was a Baker-Nutting orientation relationship with the matrix. The minor spherical V6C5 precipitates Oblique structure) and the ferrite matrix exists a certain orientation, it may be coherent VCx phase through the redistribution of carbon atoms from. Low-N and low-vanadium steel with 0.05% V, the precipitation strengthening value of about 63 MPa, adding a small amount of niobium in the ferrite to form a certain density of dislocations can effectively vanadium precipitation strengthening effect.