Research on Inclusions in Non-quenched and tempered Sulfur-bearing Steel for Autos
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摘要: 采用金相显微镜观察、扫描电镜结合能谱仪分析等方法，对不同的汽车用含硫非调质钢试样中的夹杂物进行研究。研究结果表明：汽车用含硫非调质钢中的夹杂物形态主要为条状、纺锤状和球状，呈弥散分布或群落状分布；夹杂物以单一的硫化物为主，存在少量以氧化物、氮化物为核心外裹硫化物的复合夹杂物，几乎没有单独存在的氧化物和氮化物；复合夹杂物多为球状或纺锤状（90%以上长宽比小于3）；纺锤状硫化物25%为存在核心或为伴生的复合夹杂物；较高的氧含量有利于形成复合硫化物。Abstract: Inclusions in different specimens of non-quenched and tempered sulfur-bearing steel for autos were analyzed with metallographic microscope,scanning electron microscope and energy-dispersive X-ray detector.The result shows that the inclusions in this kind of steel are dominantly in shape of strip,spindle and sphere,distributed dispersedly or in clusters.The inclusions are mainly pure MnS with a small amount of compound inclusions(with core of oxides and nitrides coated with sulfides) and little separate Al2O3 and TiN.The compound inclusion are primarily spindle and sphere-shaped(above 90% of them have a length-width ratio of less than 3).Cored or concomitant compound inclusions account for 25% of all the spindled sulfides.High oxygen is ravorable to forming compound sulfides.
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Key words:
- non-quenched and tempered sulfur-bearing steel /
- inclusion /
- sulfide /
- oxide /
- length-width ratio
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