4Cr_9Si_2锻件淬后裂纹的分析

• 作 者: 朱秀梅
• 机 构: 大连重型机器厂锻压车间,
• 出 处: 锻压机械
• 发表日期: 1984年05期
• 关键词: r_9Si_2 裂纹深度 低温回火 选择材料 示形 裂纹位置 奥氏体转变 淬火应力 心部 组织转变

我厂给首钢生产的轧机上有—如图1所示形状的锻件,根轧机的使用条件及该件在轧机上的作用,选择材料为4Cr9Si2,锻后转热处理车间淬火。当低温回火后,发现在这一批锻件中每一个锻件上都出现裂纹,且裂纹位置及形状都很有规律,都在长度为B的斜面上,或高度为H的斜面上(见图1)。但裂纹的长度及深度各异,一般裂纹深度为6毫米,最深达11毫米。对此,我们进行了如下分析。

I plant to Shougang mill production are - as shown in Figure 1 forgings, root rolling mill conditions and the role of the piece in the rolling mill, the choice of material 4Cr9Si2, forging heat treatment plant quenching. After tempering at low temperature, cracks were observed on each of the forgings in this batch, and the crack location and shape were regular, both on a slope of length B or on a slope of height H (see figure 1). But the crack length and depth vary, the general depth of 6 mm crack, the deepest up to 11 mm. In this regard, we conducted the following analysis.