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稀土对弈HARDOX耐磨板有什么影响吗?

所属分类:公司动态 发布时间:2021-02-26 11:28:24 来源:http://www.lcnmb500.com 浏览量:

HARDOX400钢液容易吸气,钢液中的H、N含量比普通钢液要高,随着钢液温度降低和结晶凝固,钢中H、N溶解度大幅度降低,特别在凝固时有大量气体析出,形成气孔,其中尤以氢气孔*为严重。稀土加入能和钢液中的H、N形成较为稳定的化合物,如RE、REH3、REN等,固定了钢液中的气体,减少了耐磨板铸件气孔缺陷。

The content of H and N in Hardox400 liquid steel is higher than that of ordinary liquid steel. With the decrease of temperature and solidification of liquid steel, the solubility of H and N in steel decreases greatly. Especially during solidification, a large number of gases precipitate and form pores, especially hydrogen pores. The addition of rare earth can form more stable compounds with H and N in molten steel, such as re, reh3, Ren, etc., which can fix the gas in molten steel and reduce the porosity defects of wear-resistant plate castings.

稀土对弈HARDOX400有什么影响吗?(图1)

HARDOX400耐磨板在液态时易氧化,其主要氧化物夹杂为MnO,分布于晶界,使晶界脆化,高温时易产生热裂,常温和低温时使韧性降低,在强冲击载荷下易开裂。稀土和氧亲和力强,稀土加入对钢液进一步脱氧,降低钢中含氧量,减少MnO夹杂在晶界的分布,改善耐磨板的冶金质量。

Hardox400 wear-resistant plate is easy to oxidize in liquid state, and its main oxide inclusion is MnO, which distributes in the grain boundary and makes the grain boundary brittle. It is easy to produce hot cracking at high temperature, and its toughness decreases at room temperature and low temperature, and it is easy to crack under strong impact load. The addition of rare earth can further deoxidize the molten steel, reduce the oxygen content in the steel, reduce the distribution of MnO inclusions in the grain boundary, and improve the metallurgical quality of wear-resistant plate.

稀土元素原子半径大,溶入Hardox400后主要存在于晶界空穴等缺陷中,所以稀土原子大多以内吸附的形式存在于晶界,降低晶界的界面能,使碳化物在晶界形核困难。

Because of the large radius of rare earth atoms, they mainly exist in the defects such as grain boundary holes after dissolving into Hardox400. Therefore, most of the rare earth atoms exist in the grain boundary in the form of internal adsorption, which reduces the interface energy of grain boundary and makes it difficult for carbides to nucleate at the grain boundary.

稀土元素在晶界上富集,填充了晶界空穴等缺陷,阻碍原子借晶界空穴进行跃迁式扩散,阻碍碳化物沿晶界长大。其次,稀土加入后能减少铸态晶界碳化物的数量,抑制碳化物在晶界形成连续网状,减少并消除针片状碳化物在晶内出现。

Rare earth elements are enriched on the grain boundary and filled with defects such as grain boundary holes, which prevent atoms from diffusing through the grain boundary holes and prevent carbides from growing along the grain boundary. Secondly, the addition of rare earth can reduce the amount of carbides in as cast grain boundary, inhibit the formation of continuous network of carbides in grain boundary, and reduce and eliminate the occurrence of needle like carbides in grain boundary.

稀土元素外层电子排列的特点是sd层电子严重不饱和,稀土元素是强烈碳化物形成元素,它和碳之间能形成REC、REZ、REq等类型特殊碳化物,并且该碳化物熔点高,如熔点高于2300℃,P吸熔点高于2200℃,Ndq熔点高于2000℃ 。

The characteristics of the outer electron arrangement of rare earth elements are that the electrons in the SD layer are seriously unsaturated. Rare earth elements are strong carbide forming elements. Rec, rez, req and other special carbides can be formed between rare earth elements and carbon, and the melting point of the carbides is high, such as melting point higher than 2300 ℃, P absorption melting point higher than 2200 ℃, NDQ melting point higher than 2000 ℃.

这些碳化物一次结晶时就弥散于晶内,当系统温度降至奥氏体中开始析出碳化物时(960℃),成为碳化物析出的结晶核心,增加了耐磨板奥氏体晶内弥散析出碳化物的数量。

When the system temperature drops to 960 ℃, these carbides become the crystal core of carbide precipitation, which increases the amount of dispersed carbides in austenite grains of wear-resistant plate.