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首页> 外文期刊>Materials Science and Engineering >Mechanical properties and microstructural characterization of medium carbon non-quenched and tempered steel: Microalloying behavior
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Mechanical properties and microstructural characterization of medium carbon non-quenched and tempered steel: Microalloying behavior

机译：中碳非调质钢的力学性能和显微组织表征：微合金化行为

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摘要

Microalloying behavior in medium carbon non-quenched and tempered steel was investigated in this paper. The mechanical properties and microstructures in steels with different V, Ti, Nb and V contents were carefully compared and analyzed. The results showed that V and N largely reduced the average size of network ferrite and increased the volume fraction of intragranular ferrite (IGF) and ferrite. Ti, and Nb had the same effect as V and N while the effect was weaker. Ti and Nb could further increase the IGF content by increasing the size of the IGF nuclei (V, Ti)(C, N) and (V, Ti, Nb)(C, N). The precipitation strengthening of V-N steel was the highest. The precipitation strengthening of other steels was weaker due to the larger size of the particles. The highest elongation of the microalloying elements free steel can be attributed to the lack of precipitation strengthening in the steel. The relatively lower elongation of V-N steel can be ascribed to the larger grain size of steel. The V(C, N) and (V, Ti)(C, N) particles decreased the impact energy of V-N steel and V-Ti-N steel. The highest impact energy of V-Ti-Nb-N steel resulted from the refinement of the grain size. The comprehensive mechanical properties can be obtained in V-Ti-Nb-N steel as: the yield strength was 509.7 MPa, the elongation was 19.2% and the impact energy AkU was 55.4 J.
机译：本文研究了中碳非调质钢的微合金化行为。仔细比较和分析了不同V，Ti，Nb和V含量的钢的力学性能和显微组织。结果表明，V和N大大减小了网络铁素体的平均尺寸，并增加了晶内铁素体（IGF）和铁素体的体积分数。 Ti和Nb与V和N具有相同的作用，但作用较弱。 Ti和Nb可以通过增加IGF核（V，Ti）（C，N）和（V，Ti，Nb）（C，N）的大小来进一步增加IGF含量。 V-N钢的析出强化最高。由于颗粒尺寸较大，其他钢的沉淀强化作用较弱。不含钢的微合金元素的最大伸长率可归因于钢中缺乏沉淀强化。 V-N钢的相对较低的伸长率可以归因于钢的较大晶粒尺寸。 V（C，N）和（V，Ti）（C，N）颗粒降低了V-N钢和V-Ti-N钢的冲击能。 V-Ti-Nb-N钢的最大冲击能来自晶粒尺寸的细化。在V-Ti-Nb-N钢中可以获得的综合机械性能为：屈服强度为509.7 MPa，伸长率为19.2％，冲击能AkU为55.4 J.

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