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时效强化是一种便于实现,且对高强度因瓦合金比较有效的强化措施。实现这一强化手段的前提是需对材料进行适当的固溶处理。为此,本文研究了N微合金化因瓦合金在固溶处理过程中微观组织和力学性能及物理性能的变化。结果表明,随着固溶处理温度的升高,在热轧态形变的奥氏体晶粒中形成新的再结晶晶粒数量不断增加,晶粒尺寸逐渐增大。当固溶处理温度为1150℃时,热轧态析出的第二相粒子已基本完全溶解于奥氏体基体,此时的材料不仅晶粒细小,而且具有较高的硬度(187.4 HV0.1)、强度(R_m=625.6 MPa)和最好的塑性(A=37.0%)。尽管其膨胀系数是热轧态的1.20倍,但仍处在4.41×10~(-6)℃~(-1)很低水平。固溶处理温度进一步增加,不仅使奥氏体晶粒急剧增加,而且使材料的力学性能和膨胀特性全面恶化。
Aging is a kind of easy to implement, and the high strength Invar alloy more effective measures to strengthen. The premise for achieving this enhancement is the need for proper solution treatment of the material. Therefore, this paper studies the microstructure, mechanical properties and physical properties of N microalloying Invar alloy during solution treatment. The results show that with the increase of solution treatment temperature, the number of new recrystallized grains formed in the as-hot deformed austenite grains increases and the grain size increases gradually. When the solution treatment temperature is 1150 ℃, the second-phase particles precipitated in the hot-rolled state are almost completely dissolved in the austenite matrix. At this time, the material has not only fine grains but also high hardness (187.4 HV0.1) , Strength (Rm = 625.6 MPa) and the best ductility (A = 37.0%). Although its coefficient of expansion is 1.20 times that of hot rolled, it is still at a very low level of 4.41 × 10 -6 ℃ -1. The further increase of the solution treatment temperature not only increases the austenite grains sharply, but also deteriorates the mechanical properties and the swollenness characteristics of the material.