金属材料毕业设计.doc

哈尔滨工业大学工学硕士学位论文 哈尔滨理工大学学士学位论文 - PAGE II - -  PAGE II - 热处理对耐热铸钢G-X12CrMoWVNbN10-1-1组织和性能的影响 摘要 本文通过对G-X12CrMoWVNbN10-1-1高强耐热钢进行了热处理试验、金相组织观察和性能测试等，对其进行了组织与性能关系的研究；并对耐热钢、不锈钢和普通碳素钢进行高温拉伸试验，对断口进行扫描电镜的微观组织观察及分析。试验结果表明： 耐热钢铸态组织为不均匀板条马氏体；正火获得的组织为均匀板条马氏体，这种组织的硬度比较高，塑性和韧性不是很好；正火＋回火获得的组织为回火马氏体，这种组织硬度较未经回火的马氏体硬度有所下降，塑性和韧性比较好，具有良好的综合性能。 对铸造G-X12CrMoWVNbN10-1-1高强高温力学性能做了相应的实验通过与普通碳素钢(ZG20SiMn)、不锈钢(ZG0Cr13Ni4Mo)等的高温性能和断口扫描的对比，得出G-X12CrMoWVNbN10-1-1的组织与高温力学性能的关系。 高温强度是耐热钢性能的一个重要指标，本试验对G-X12钢进行了高温拉伸试验，但是由于制钢工艺上的缺陷，使钢中杂质含量较多，影响了其高温拉伸性能。但是通过与普通碳素钢(ZG20SiMn)和不锈钢(ZG0Cr13Ni4Mo)的高温性能对比，还是显示了它很好的抗拉强度。通过断口扫描分析，钢在高温下的断裂方式为韧性断裂。 关键词　高强耐热钢；热处理；组织与性能；G-X12CrMoWVNbN10-1-1 Heat treatment of high strength heat resistant steel and Performance (G-X12CrMoWVNbN10-1 - 1) Abstract In this paper,the heat treatment metallurgical structure’s dservation and performance testing of the high strength heat resistant steel G-X12CrMoW VNbN10-1-1 was did,and the relationship between the structure and performance was studyed;according to the high temperature tension test of the high strength heat resistant steel,the stainless steel and the carbon steel.The result indicate: The structure of the casting steel is marten site;the normalized structure is lath martensite,it’shardness is high,plasicity and ductility isn’t well.The structure after tempered is tempered martensite,it’s hardness is much lower,plasticity and ductility is well,the combination is good. Aceording to the comparison,of the high temperature tentension test,get the relationship detween G-X12CrMoWVNbN10-1-1structure and mechanical beharior under migh temperature. High temperature strength is an important index of the heat-resistant steel.Bscuse of the dufectof the producuive Techology,there’s some impurity in the steel,influence it’s hightemperature tension.Through the comparson between carbon steel and stainless steel,thr heat-resistant steel.Shows well tensile strergth.Aceording to the SEM of the fracture indvcate.the favlure mods is