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为了得到Monel-400合金焊材熔敷金属的高温力学性能及断裂形式,利用Gleeble-1500D热模拟机对不同方案(最高温度保温→降温到试验温度→拉伸、试验温度保温→拉伸)和不同温度(700、800、900、1000和1100℃)下的熔敷金属进行拉伸试验。结果表明,熔敷金属在700℃和800℃下具有很好的高温力学性能和塑性,最大屈服强度和抗拉强度分别为148.6 MPa和284.1 MPa,最大断面收缩率和伸长率分别为78%和11%,在此温度区间,试验方案对材料的屈服强度、断面收缩率和伸长率有较大影响,最大差距分别为44%、36%和35%,对材料的抗拉强度影响较小。在900~1100℃之间,随着试验温度的升高,材料的力学性能和塑性急剧下降,并随温度的升高逐步趋于一致,最小屈服强度和抗拉强度分别为19.3 MPa和68.6 MPa,最小断面收缩率和伸长率分别为18.85%和0.87%,在此温度区间,试验方案对材料的力学性能和塑性影响很小。经QUANTA-400环境扫描电子显微镜观测,熔敷金属在700℃下的断裂形式为韧性断裂,在800~900℃之间出现了低塑性区,产生了热脆现象,在1100℃下的断裂形式为脆性断裂。
In order to obtain the mechanical properties and fracture forms of the deposited metal of Monel-400 alloy, the mechanical properties of the deposited metal of Monel-400 alloy were studied by using the Gleeble-1500D thermal simulator. The results showed that the maximum temperature, the temperature, the test temperature, the tensile temperature and the test temperature, Tensile tests were performed on the deposited metal at different temperatures (700, 800, 900, 1000 and 1100 ° C). The results show that the deposited metal has good high temperature mechanical properties and plasticity at 700 ℃ and 800 ℃. The maximum yield strength and tensile strength are 148.6 MPa and 284.1 MPa, respectively. The maximum reduction and elongation of the cross section are 78% and 11%. In this temperature range, the test program has a great influence on the yield strength, the reduction of area and the elongation of the material. The maximum difference is 44%, 36% and 35% respectively, which has little effect on the tensile strength of the material. With the increase of test temperature, the mechanical properties and ductility of the materials decreased sharply at 900 ~ 1100 ℃ and gradually converged with the increase of temperature. The minimum yield strength and tensile strength were 19.3 MPa and 68.6 MPa, respectively , The minimum section shrinkage and elongation are 18.85% and 0.87%, respectively. During this temperature range, the experimental scheme has little effect on the mechanical properties and plasticity of the material. The results of QUANTA-400 environmental scanning electron microscope showed that the fracture morphology of the deposited metal at 700 ℃ was ductile fracture, and the low plasticity zone appeared at 800-900 ℃, resulting in the phenomenon of hot brittle fracture at 1100 ℃ For brittle fracture.