一、前言 随着燃气涡轮的快速发展,国内外创制了许多高温合金。在燃气涡轮使用的典型的镍基、钴基高温合金中,普遍地都添加有微量的硼(0.01～0.02%B)、锆元素,用来净化晶界、改善高温特性、增加高温断裂强度。一般认为这是硼在铸造高温合金中发挥了强化晶界的作用。 美国Sorcery金属公司的B-1900合金研制者Baldwin从1968年起经过几年时间研 I. Introduction With the rapid development of gas turbines, many high-temperature alloys have been created at home and abroad. In typical nickel-base and cobalt-based superalloys used in gas turbines, a trace amount of boron (0.01-0.02% B), zirconium, is generally added to clean the grain boundaries, improve high-temperature properties and increase high-temperature rupture strength. It is generally believed that boron plays a role of strengthening grain boundaries in the casting of superalloys. Baldwin, a B-1900 alloy producer at Sorcery Metals Company in the United States, has been studying for several years since 1968