摘要:
对实验室冶炼合金元素种类、含量不同的船板钢铸态组织及其中显微夹杂物的成分、粒径进行分析。结果表明:试验钢中部分显微夹杂物可诱发IAF形核, 且在IAF长大过程中其针状尖端可穿插到其他铁素体晶粒或珠光体内, 将其拆分成多个更加细小的单元, 能够明显地细化组织;钢中诱导IAF形核的显微夹杂物成分主要为Al2O3-Ti2O3、Al2O3-Ti2O3-MnO/MnS、Al2O3-Ti2O3-MnO/MnS-Si O2类复合脱氧夹杂, 粒径在1.010μm, 其中大部分夹杂物粒径在1.06.0μm, 约占89.3%, 少部分夹杂物粒径在6.010.0μm, 约占10.7%。通过控制合金种类、含量以及加入顺序促使钢中生成大量细小、弥散的有益夹杂诱导大量IAF形核, 从而细化晶粒。
关键词:
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船板钢 /
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铸态组织 /
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显微夹杂 /
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IAF
Abstract:
The structure,composition,particle size of micro-inclusions in laboratory as-cast shipbuilding steel with different content and type of elements were analyzed. It was found out that some kinds of inclusions in steel can induce nucleation of IAF and the needle tip of IAF can insert into other ferrite grains or pearlite and thus splitting it into several smaller units in the process of growth,resulting in significant grain refinement. The component of inclusions capable of inducing IAF nucleation in the steel are mainly Al2O3-Ti2O3、Al2O3-Ti2O3-MnO/MnS、Al2O3-Ti2O3-MnO/Mn S-SiO2 composite deoxidation inclusions,and their particle size was 1.0 ~10 μm. 89.3% of the inclusions are between 1.0 ~6.0 μm,about,and the rest 10. 7% are between 6. 0 ~10. 0 μm. By controlling the types of alloy elements and adding sequence,a large number of fine inclusions which can induce intensive IAF nucleation can be produced and then achieve grain refinement.
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