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。
The structure change in heat affected zone (HAZ) and its influence onproperties of welded white cast iron have been investigated by means of thermal cy-cle simulation technique. The structure of white cast iron at peak temperature 800℃is examined as cementite in pearlitic matrix, of which the hardness and impact to-ughness are the lowest in all temperatures during the tests. While the structure aftercyclic heating at high peak temperature is mainly cementite together with twin mar-tensite, of which the hardness and impact toughness are rather higher. The phaseboundaries, were fine precipitates occur, in the structure of low hardness are smoothand regular. Both cleavage and interphase fracture were revealed in the structure oflow hardness, but transgranular fracture was revealed in that of high hardness.
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