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HARDOX450耐磨板防止热裂和冷裂有什么办法?

所属分类:常见问题 发布时间:2021-02-19 11:47:07 来源:http://www.lcnmb500.com 浏览量:

HARDOX450耐磨板工厂防止裂纹的措施。当铸造内应力超过金属材料的抗拉强度时,铸件便产生裂纹,根据铸件所处温度的不同,裂纹可分为热裂和冷裂两种。

Hardox450 wear resistant plate factory crack prevention measures. When the internal stress exceeds the tensile strength of the metal material, the casting will produce cracks. According to the temperature of the casting, the cracks can be divided into hot crack and cold crack.

①热裂。高温下的金属强度很低,如果金属的线收缩受到铸型或型芯的阻碍,机械应力超过该温度下金属的强度,便产生热裂。

① Hot cracking. The strength of the metal at high temperature is very low. If the linear shrinkage of the metal is hindered by the mold or core, and the mechanical stress exceeds the strength of the metal at this temperature, hot cracking will occur.

HARDOX450耐磨板防止热裂和冷裂有什么办法?(图1)

耐磨板热裂纹特征:热裂纹尺寸较短、缝隙较宽、形状曲折、缝内呈严重的氧化色。影响热裂因素主要是合金性质(合金的结晶特点和化学成分)和铸型阻力(铸型、型芯的退让性)。

Hot crack characteristics of wear-resistant plate: the size of hot crack is short, the gap is wide, the shape is zigzag, and serious oxidation color appears in the gap. The main influencing factors of hot cracking are alloy properties (crystallization characteristics and chemical composition) and mold resistance (concession of mold and core).

HARDOX450耐磨板工厂防止热裂的方法:合理的铸件结构;良好的型砂和芯砂的退让性;严格限制钢和铸铁中硫的含量(特别是后者,因为硫能增加钢和铸铁的热脆性,使合金的高温强度降低)等。

Methods to prevent hot cracking in hardox450 wear resistant plate factory: reasonable casting structure; good concession of molding sand and core sand; strict limitation of sulfur content in steel and cast iron (especially the latter, because sulfur can increase the hot brittleness of steel and cast iron and reduce the high temperature strength of alloy), etc.

②耐磨板冷裂纹特征:表面光滑,具有金属光泽或呈微氧化色,贯穿整个晶粒,常呈圆滑曲线或直线状。脆性大、塑性差的合金,如白口铸铁、高碳钢及某些钢*易产生冷裂纹,大型复杂铸铁件也易产生冷裂纹。冷裂往往出现在铸件受拉应力的部位,特别是应力集中的部位。

② Characteristics of cold cracks in wear-resistant plate: smooth surface, metallic luster or micro oxidation color, running through the whole grain, usually in smooth curve or straight line. The alloys with high brittleness and poor plasticity, such as white cast iron, high carbon steel and some steels, are easy to produce cold cracks, and large complex iron castings are also easy to produce cold cracks. Cold cracking often occurs in the part of casting under tensile stress, especially in the part of stress concentration.

HARDOX450耐磨板工厂防止冷裂的方法:减小铸造内应力和降低合金的脆性。如铸件壁厚要均匀;增加型砂和芯砂的退让性;降低钢和铸铁中的磷含量(因为磷能显著降低合金的冲击韧度,使钢产生冷脆。如铸钢的磷含量大于0.1%、铸铁的磷含量大于05%时,因冲击韧度急剧下降,冷裂倾向明显增加)。

The method to prevent cold cracking in hardox450 wear resistant plate factory is to reduce the internal stress of casting and the brittleness of alloy. For example, the wall thickness of castings should be uniform; the concession of molding sand and core sand should be increased; the phosphorus content in steel and cast iron should be reduced (because phosphorus can significantly reduce the impact toughness of alloy and make steel produce cold embrittlement). For example, when the phosphorus content of cast steel is more than 0.1% and that of cast iron is more than 05%, the cold cracking tendency increases obviously due to the sharp decrease of impact toughness).