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晶界夹杂物对QT400-18L性能的影响
Effect of Cell Boundary Inclusions on QT400-18L Properties
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- DOI:
- 作者:
- 邓晗 陈璐 朱贵华
DENG Han;CHEN Lu;ZHU Guihua
- 作者单位:
- 中车戚墅堰机车车辆工艺研究所有限公司
CRCC Qishuyan locomotive&Rolling Stock Technology Research Institute Co.,Ltd.,Changzhou 213011,China
- 关键词:
- 低温球铁 夹杂物 细晶强化
low temperature ductile iron inclusions fine grain strengthening
- 摘要:
- 研究了晶界夹杂物导致其低温冲击韧度下降的微观机理,并采用热处理技术降低晶界偏析并提高晶粒度等级,提升材料的低温冲击韧度和抗拉强度。研究表明,聚集在晶界处的夹杂物有碳化物和氧化物两种类型,使材料的抗拉强度和冲击韧度大幅降低,采用常规高温石墨化退火无法提升其低温冲击韧度。通过细晶强化热处理技术,将晶粒度从30~40μm细化至15~25μm,抗拉强度由383 MPa提升至418 MPa,-40℃低温冲击韧度由7 J提升至14 J以上。This paper studies the microscopic mechanism of low temperature impact toughness reduction caused by grain boundary inclusions,and heat treatment technology is adopted to reduce grain boundary segregation and improve grain size grade,thus improving low temperature impact toughness and tensile strength of materials.The research shows that the inclusions accumulated at the grain boundary are carbide and oxide,which greatly reduce the tensile strength and impact toughness of the material.Conventional high-temperature graphitization annealing cannot improve its low-temperature impact toughness.Through fine grain strengthening heat treatment technology,the grain size is improved from 30 um^40 um to 15 um^25 um,the tensile strength is improved from 383 MPa to 418 MPa,and the low temperature impact toughness at-40℃is improved from 7 J to more than 14 J.