论文部分内容阅读
我厂生产的ZG2Cr13钢铸件,在三次调质处理后发现强度、塑性良好而因韧性低劣报废。金相分析表明,ZG2Crl3钢调质组织中出现回火索氏体+铁素体+碳化物(S+α+Cm)复相组织、且碳化物颗粒粗大,沿α相界呈链状分布时,是产生上述现象的主要原因。然而,在S+α+Cm复相组织中,何种相组织对恶化韧性起主导作用;复相组织的韧性能否改善等等,是我们关心的问题,也是本文研究和讨论的主要内容。
I plant ZG2Cr13 steel castings found in quenching and tempering after the three found that strength, good plasticity due to poor toughness scrapping. Metallographic analysis showed that tempered sorbite + ferrite + carbide (S + α + Cm) complex phase appeared in the quenched and tempered ZG2Crl3 steel, and the carbide particles were coarse and distributed in a chain along the α phase , Is the main reason for the above phenomenon. However, in S + α + Cm complex phase, what kind of phase structure plays a leading role in deteriorating toughness; whether the toughness of complex phase can be improved or not is our concern, which is also the main content of this dissertation.