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用光学金相及电子探针对15MnMoVNR钢非金属夹杂物进行了研究。发现在低的RE/S=(0.5～2)比值条件下,稀土元素能部份地改善硫化物形态,使球状、粒状及条状硫化物共存于钢中。电子探针分析证实,除个别情况外,粒状硫化物均为稀土硫化物(RE)_2S_3,且不含Mn、Mo、V等元素;而长条状硫化物则为MnS,而不含RE及Mo、V等元素。氧化物夹杂均为稀土氧化物。文中还讨论了夹杂物形态对钢性能的影响。为进一步改善钢的横向塑韧性,有必要提高钢中稀土元素的实际含量。
Non-metallic inclusions in 15MnMoVNR steel were studied by optical metallography and electron probe. It is found that the rare earth elements can partially improve the morphology of sulfides under the condition of low RE / S = (0.5 ~ 2) ratio, so that spherical, granular and stripped sulfides coexist in the steel. Electron probe analysis confirmed that, except for a few cases, the granular sulfides were all rare earth sulfide (RE) _2S_3 and did not contain Mn, Mo, V and other elements; while the long strip sulfide was MnS without RE and Mo, V and other elements. Oxide inclusions are rare earth oxides. The article also discusses the influence of inclusion morphology on the properties of steel. To further improve the lateral plasticity of steel, it is necessary to increase the actual content of rare earth elements in steel.