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探讨了钒含量对高氮20MnSi螺纹钢组织和室温冲击韧性的影响,并利用扫描电镜对试验钢的宏观和微观断口形貌进行分析。结果表明:随钒含量的增加,高氮20MnSi螺纹钢晶粒由8.6μm变化到2.1μm,显著细化了晶粒;常温下钒提高了试验钢冲击韧性的敏感程度,钒含量的增加使冲击功由5.8J变化到97.2 J,并且当钒含量为0.047%时,冲击功达到99.6 J;在高氮条件下,钒含量的增加使20MnSi螺纹钢脆性区转变为塑性区,但在C含量高(0.052%)的试验钢中冲击韧性有所降低。
The effect of vanadium content on the microstructure and room temperature impact toughness of high nitrogen 20MnSi rebar was discussed. The macroscopic and microscopic fracture morphology of the test steel was analyzed by scanning electron microscopy. The results show that with the increase of vanadium content, the grain size of high-nitrogen 20MnSi rebar changes from 8.6μm to 2.1μm, and the grain size is remarkably refined. At normal temperature, vanadium increases the sensitivity of test steel to impact toughness. The increase of vanadium content makes the impact The work function changes from 5.8J to 97.2J, and the impact energy reaches 99.6J when the vanadium content is 0.047%. Under the high nitrogen condition, the increase of vanadium content makes the brittleness zone of 20MnSi rebar into plastic zone, (0.052%) of the test steel in the impact toughness decreased.