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首页> 外文会议>Pacific Rim International Conference on Advanced Materials and Processing(PRICM 5) pt.1; 20041102-05; Beijing(CN) >INFLUENCE OF MICROSTRUCTURAL CHANGES AND GRAIN BOUNDARY PRECIPITATION ON THE BEHAVIOR OF 25Ni-15Cr-2Ti SUPERALLOY DURING HIGH TEMPERATURE CREEP
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INFLUENCE OF MICROSTRUCTURAL CHANGES AND GRAIN BOUNDARY PRECIPITATION ON THE BEHAVIOR OF 25Ni-15Cr-2Ti SUPERALLOY DURING HIGH TEMPERATURE CREEP

机译：高温蠕变过程中微观组织变化和晶界析出对25Ni-15Cr-2Ti高温合金行为的影响

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摘要

Iron-base superalloys are well known materials having excellent high temperature properties. They are used in turbo superchargers and turbine engines required for aerospace and power plants. In this investigation precipitation hardenable X5NiCrTi26-15 was used to study the influence of microstructural changes on the creep behavior at different conditions . Different creep cycles were applied for both base alloy and laser beam welded alloy (6kW CO2 ) namely at 600 , 625 and 650C at applied controlled creep stresses of 400 and 450 MPa . The base material sheet was used in as solution annealed state ( 30 min, 960 C, WQ ). The specimens were hardened in two steps (24h,760 C, FC and 16h, 705 C,AC ) before being investigated . The microstructural changes due to grain boundary sliding, intergranual fracture perpendicular to the metal flow axis , and the type ,morphology of different secondary carbides were measured and discussed . To examine the changes in microstructure Philips EM 400 TEM with an acceleration voltage of 120KV, and SEM as well as light microscopy were used . It was found that, laser beam welded structure investigated after creep deformation at temperatures lower than 650C and at controlled stress of 400 and 450 MPa , showed a textured weld metal zone with dendrite having lower hardness combined with a higher creep resistance than that for base material. It was found also that creeping at 650C at the same stress values offsets any gain in creep resistance of welded joints as compared with that for the base material at the same conditions.
机译：铁基高温合金是众所周知的具有优异高温性能的材料。它们用于航空航天和发电厂所需的涡轮增压器和涡轮发动机。在这项研究中，用沉淀硬化X5NiCrTi26-15研究了在不同条件下微观组织变化对蠕变行为的影响。在600，625和650℃下，分别对基础合金和激光束焊接合金（6kW CO2）施加了不同的蠕变周期，施加的受控蠕变应力为400和450 MPa。该基材片材以溶液退火状态（30分钟，960℃，WQ）使用。在研究之前，将样品分两个步骤（24h，760 C，FC和16h，705 C，AC）硬化。测量和讨论了由于晶界滑动，垂直于金属流轴的晶界断裂，不同次生碳化物的类型，形态而引起的显微组织变化。为了检查在120KV加速电压下的飞利浦EM 400 TEM的微观结构变化，并使用了SEM和光学显微镜。结果发现，在低于650℃的温度下以及在400和450 MPa的控制应力下蠕变变形后进行研究的激光束焊接结构，显示出织构化的焊接金属区域，其枝晶的硬度比基体材料低，并且具有更高的抗蠕变性。 。还发现，与在相同条件下的母材相比，在相同应力值下在650C时的蠕变抵消了焊接接头的抗蠕变性。

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