H13热作模具钢退火后探伤不合格原因分析
Cause Analysis of Unqualified Inspectionof H13 Hot Work Die Steel after Annealing
摘 要
某公司生产的H13热作模具钢在退火后的探伤时发现了缺陷，在低倍检验时发现心部存在微裂纹，采用金相显微镜、扫描电镜及能谱仪等对试验钢微裂纹的形成原因进行了分析。结果表明：试验钢钢锭在凝固过程中形成了严重的组织偏析，偏析带中大量的脆性Al2O3、Al2O3和MnS复合夹杂物，粗大块状的共晶碳化物偏聚产生内应力，这是造成试验钢退火后心部产生微裂纹的原因。
微裂纹
共晶碳化物
偏析
夹杂物
H13 steel
microcrack
eutectic carbide
segregation
inclusion
Abstract
Microcrack defects in the center of H13 Hot working die steel were detected by ultrasonic inspection and macrostructure test. In this paper, the cause of microcrack die steel was analysed by optical microscopy,scanning electronic microscopy and energy dispersive spectrometer.The results indicated that the severe microstructure segregation formed in ingot solidification process and internal stress caused by the large amount of brittle Al2O3,Al2O3-MnS compound inclusionsand blocky eutectic carbidesin thesegregation bandswere the causes of micro-cracks in the center area.
中图分类号 TF763
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备注胡连新(1991-),男,安徽淮南人,硕士研究生,主要研究方向为工模具钢的研制与开发
引用该论文: HU Lianxin,ZHOU Jian,LIN Peng,CHI Hongxiao,MA Dangshen. Cause Analysis of Unqualified Inspectionof H13 Hot Work Die Steel after Annealing[J]. Materials for mechancial engineering, 2017, 41(Z2): 18～22
胡连新,周健,林鹏,迟宏宵,马党参. H13热作模具钢退火后探伤不合格原因分析[J]. 机械工程材料, 2017, 41(Z2): 18～22
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参考文献
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【2】AFAZOV S M,BECKER A A,HYDE T H. FE prediction of residual stresses of investment casting in a Bottom Core Vane under equiaxed cooling[J].Journal of Manufactur-ing Processes,2011,12(1):30-40.
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【4】SANG Baoguang, KANG Xiuhong, LI Dianzhong. A noveltechnique for reducing macro segregation in heavy steelingots[J].Journal of Materials Processing Technology,2010,210(4):703-711.
【5】宋瑞甫.提高电渣锭质量的实践与探讨[J].宽厚板,2001,7(5):23-44.
【6】郭景喻. 5355J2G3电渣锭疏松缺陷的分析与改善[J]. 大型铸锻件, 2016(2):48-50.
【7】胡俊辉.低碳高硫磷钢硫化物凝固析出的热力学分析[J].宝钢技术,2005(5):50-53.
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