摘要
分析了钢的高温力学性能和作用在连铸坯上的各种应力以及化学成分对铸坯产生裂纹的影响。指出裂纹产生的外因是钢水的静压力、热应力、组织收缩应力和其它外力的作用。当这些应力之和超过了钢的高温临界强度和变形量时 ,就在凝固前沿或凝固壳中产生裂纹。在二冷区凡是增加其内应力 ,降低强度和塑性的因素将促进裂纹的发生和扩展 ;裂纹产生的内因是钢的高温力学性能和化学成分。提出了防止连铸坯产生裂纹应从两方面考虑 ,一是工艺参数和设备运转状态 ,设法降低连铸坯承受的应变和应变速率 ;二是钢的化学成分 。
It is analyzed that originating of cracks on some CC billets will be influenced by steel property at high temperature?various strain exerted on the billets and its chemical composition in this article. It is pointed out that the external causes of cracks originating are effected by static pressure, thermal stress and structural shrinking stress and etc. When the sum of this stress exceeds high temperature critical strength and the amount of deformation, a crack will be originated along solidified frontend or solidifying shell, and then extending in the secondary cooling zone; All factors increasing internal stress and decreasing steel strength and plasticity will promote the originating of cracks. The internal causes are the high temperature mechanical property and chemical composition of this steel .It is put forward that two aspects should be considered for prevention of cracks :one is that all technological parameter and equipment operation status in continuous casting, reduce strain and strain rate; the other is that the steel chemical composition aims to aims to improve purity of liquid steel.
出处
《湖南冶金》
2002年第1期28-31,42,共5页
Hunan Metallurgy
