ZOU Zengda WANG Yong REN Dengyi Shandong Polytechnic University
,
Jinan
,
China
金属学报(英文版)
The structural change in heat affected zone(HAZ)and its influence on properties of welded white cast iron have been investigated by means of thermal cycle simulation technique.The structure of the white cast iron at peak temperature 800℃ was examined as cementite in pearlitic matrix,of which the hardness and impact toughness are the lowest,while the struc- ture after cyclic heating at high peak temperature is mainly cementite together with twin martensite,of which the hardness and impact toughness are rather higher.The phase bounda- ries in the structure of low hardness are smooth and regular as well as with fine precipitates. Both the cleavage and interphase fracture were revealed in the structure of low hardness,while the transgranular fracture was found in those areas of higher hardness.
关键词:
white cast iron
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null
,
null
张克平
,
姜良朋
,
王久鑫
机械工程材料
doi:10.11973/jxgccl201612013
利用模拟辊式制粉工况磨损试验机,对铬含量(质量分数,下同)分别为0,1．2％,4．0％的3种白口铸铁进行了小麦粉料磨损试验,研究了铬含量对白口铸铁磨损质量损失和磨损形貌的影响.结果表明：铬的添加能提高白口铸铁的抗小麦粉料磨损能力,铬含量为4．0％时,白口铸铁的磨损质量损失约为铬含量为0时的32％；随着铬含量的提高,白口铸铁被磨面的沟槽宽度与深度、棱脊峰谷值,以及金属元素含量均有所降低,但硬度显著增大,并且磨损表面的犁沟变浅变窄,犁沟两侧的犁皱变得不明显.
关键词:
磨粒磨损
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小麦粉
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白口铸铁
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铬含量
邹增大
,
王勇
,
任登义
金属学报
采用热模拟技术再现白口铸铁焊接热影响区的组织,研究了焊接热影响区的组织转变及其对性能的影响,发现热循环峰温为800℃时,白口铸铁的组织为渗碳体加珠光体,其硬度最低,冲击韧性最差;高峰温热循环作用后的组织主要为渗碳体加孪晶马氏体,其硬度较高,冲击韧性较好;低硬度组织的相界面平滑、圆整,并且界面上有细小化合物析出,其断裂为解理加沿相界断裂,高硬度组织的断裂为穿晶断裂。
关键词:
白口铸铁
,
heat affected zone simulation
,
hardness
