秦子强
,
余宗森
金属学报
<正> 铸铁孕育技术的应用已逾六十年,至今对孕育的机理仍不很清楚。争议的焦点在于,究竟是孕育提供了石墨形核的异质基底;抑或激发了石墨自身形核。当前大多数人持前一观点。 以往的工作对孕育铁水中碳分布的实验研究较欠缺。由于对孕育过程中的碳分布图像了解不够,必然影响了对孕育本质的认识。 本文从微观和统计的角度对孕育样品中碳的浓度和活度分布的特点进行了测定,在此基础上探讨了孕育机理。
关键词:
铸铁
,
inoculation
,
catbon activity
,
electron
WAMG Chunqi YANG Jiguang Tianjin University
,
Tianjin
,
China associate professor
,
Faculty of Foundry
,
Tianjin University.Tianjin 300072
,
China
金属学报(英文版)
Melted cast iron was inoculated by FeSi,then quenched to interrupt the dissolution, the non-metallic inclusions,in which the graphite phase was already occured,formed in the dissolution region,They dissolved into the melt soon,but the inclusions coated by graphite could exist for along time.The function of inoculant is to create an undercooling solution for carbon,thereby the non-metallic inclusions in the solution may be activated as the nuclei for graphite.
关键词:
inoculation
,
null
,
null
孙海旋
,
孙大千
,
王心醉
机械工程材料
使用孕育坑并选用A1—10Sr作为孕育剂对镁合金点焊熔核进行孕育处理，研究了锶添加量对镁合金电阻点焊熔核组织与力学性能的影响。结果表明：当A1—10Sr的添加量从0增加到1．4mg时，熔核组织中胞状树枝晶区平均宽度从332pm减小至58μm，组织明显细化；且点焊接头最大拉剪力从2．379kN逐渐提高到2．959kN，提高了24．3％。
关键词:
镁合金
,
电阻点焊
,
孕育处理
,
锶
