V元素对4140钢管组织与性能的影响OA

Analyzed here in the article is the effect of addition of Element V on the post-quenching and tempering treatment microstructure,and type and distribution characteristics of the precipitated phase of the 4140 mechanical tool-purposed tube.The test results show that addition of V causes solution strengthening and induces precipitation of the fine vanadium carbides so as to produce the pinning effect,which gets the austenitic grains of the 4140 mechanical tool-purposed tube obviously refined,which in turn leads to enhancing the microstructure homogeneity;meanwhile,under the precondition that the same strength level is guaranteed,the addition of V,the refined grains and the uniformly distributed precipitated phase can effectively prevent the initiation and propagation of cracks so as to get the impact toughness of the material remarkably enhanced.