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在Gleeble-3800热模拟试验机上对添加不同合金元素的沉淀强化型高强钢进行高温拉伸试验,分析了断面收缩率和抗拉强度随温度的变化情况,利用扫描电镜观察断口形貌。结果表明:在850~1300℃范围内含Ni钢、不含Nb和Ni钢及含Nb钢均存在高塑性区到低塑性区间明显的温度转折区,转折温度点分别为1000、1050和1150℃;含Nb试验钢的抗拉强度最高;3种试验钢的断口以韧性断裂为主,韧窝形状及尺寸是影响试验钢性能的主要因素。
High-temperature tensile tests were carried out on Gleeble-3800 thermal simulation test machine for precipitation-strengthened high-strength steel with different alloying elements. The change of area shrinkage and tensile strength with temperature were analyzed. The fracture appearance was observed by scanning electron microscopy. The results show that in the range of 850 ~ 1300 ℃, Ni, Nb and Ni-free steel and Nb-containing steel all have obvious transition zones from high plasticity zone to low plasticity zone with transition temperatures of 1000, 1050 and 1150 ℃ respectively ; The Nb-containing test steel has the highest tensile strength; the fracture surface of the three kinds of test steel is dominated by ductile fracture, and the dimple shape and size are the main factors that affect the performance of the test steel.