铝质量分数对耐热钢组织和塑性变形断裂影响

Effect of w(Al) on organization and heat-plastic deformation of novel heat-resistant steel

采用Jmat Pro材料性能模拟软件与试验研究结合的方法,研究分析了3种不同铝质量分数新型ZG1Cr10Ni Al Mo VNb N耐热钢正火+高温回火后的显微组织,模拟了3种试验钢在常温下拉伸试验的应力-应变曲线,并结合拉伸试验数据和断口形貌分析了其断裂机制。结果表明,模拟结果与试验结果较为吻合,随着钢中铝质量分数的增加,断裂机制发生由微孔聚集型断裂向准解理断裂、解理断裂的转变。结合显微组织分析得出铝质量分数是影响碳化物类型、形状以及分布的主要影响因素。

Using the means of Jmat Pro material performance simulation software combined with experimental research,the microstructures of three kinds of ZG1 Cr10 NiAlMoVNbN heat-resistant steels with different w（Al） after normalizing and high-temperature tempering were studied. Three kinds of test steels were simulated at room temperature and the fracture mechanism was analyzed according to the tensile test data and fracture morphology. The results show that the simulation results are in good agreement with the experimental results. With the increase of w（Al） in the steel,the fracture mechanism changes from microporous aggregated fracture to quasi-cleavage fracture and cleavage fracture. Combined with microstructure analysis,the w（Al） is the main factor on the carbide type,shape and distribution.