锻压技术

N02200板材热加工断裂失效分析

英文标题：Analysis on fracture failure of N02200 plate in thermal processing

作者：杨哲李桂张树志杨晗程伟

分类号：TG339

出版年,卷(期):页码：2020,45(6):163-167

摘要：

为了研究N02200板材热加工过程中发生断裂的原因，对出现的断裂失效部位进行取样分析，采用化学成分分析、光学显微镜、扫描电镜、能谱分析等手段，对N02200板材的化学成分、金相组织、断口形貌进行分析，研究其断裂失效机制。结果表明，高温长时间加热致使金属内碳发生石墨化转变并偏聚于晶界，熔炼时过量氧化铝类夹杂物以及原料带入的Si-Ca-Mg-Al类裹渣非金属夹杂物等3类晶界夹杂导致晶界脆性，是N02200板材热加工过程中失效的主要原因。通过控制原料清洁度以减少非金属夹杂、改进熔炼工艺以减少氧化铝类夹杂和调整加热规程以降低加热时间，降低了晶界处各种夹杂、提高了热加工性能。

In order to study the cause of fracture for N02200 plate in the thermal processing, the fracture failure areas appearing on the part were sampled and analyzed, and its chemical composition, metallographical structure and fracture morphology were analyzed by chemical composition analysis, optical microscope, scanning electron microscope and energy spectrum analysis. The mechanism of fracture failure was studied. The results show that the graphitization transition of carbon in the metal and segregating at the grain boundaries caused by high-temperature heating for a long time, the excess alumina inclusions during melting and the Si-Ca-Mg-Al slag non-metallic inclusions introduced by the raw materials lead to brittleness of the grain boundary, which is the main reason for the failure of N02200 plate in the thermal processing. Furthermore, by controlling the cleanliness of raw materials to reduce the non-metallic inclusions and improving the melting technical process to reduce alumina inclusions and adjusting the heating procedure to decrease the heating time, all kinds of inclusions at the grain boundaries are reduced and the thermal processing performance is improved.

基金项目：

杨哲（1986-），男，学士，工程师 E-mail：baotailangzi@163.com

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