采用金相法测定了锆锡系Zr4锆合金和锆铌系N36锆合金由α+β相转变为β相的相变温度T_α+β→β。结果表明：可以通过金相法测定锆合金的相变温度T_α+β→β，在相变温度T_α+β→β附近淬火，通过观察试样α相含量的变化，确定α相未完全转变和完全转变的温度区间，相变温度T_α+β→β取该区间的下限值，热处理加热温度间隔建议选择为10℃；试验测得Zr4锆合金的T_α+β→β为970℃，N36锆合金的T_α+β→β为890℃。

The phase transformation temperature T_α+β→β from α + β phase to β phase of Zr-4 and N36 zircaloys was determined by metallographic method. The results show that the phase transformation temperature T_α+β→β of zircaloys could be determined by metallographic method. By quenching the samples at the temperatures near the phase transformation temperature T_α+β→β and then observing the change of α phase contents, the temperature range of incomplete transformation and complete transformation of α phase was determined, and the lower limit value of the temperature range was taken as the phase transformation temperature T_α+β→β. The recommended heat treatment heating temperature interval was 10℃. The measured T_α+β→β of Zr-4 zircaloy was 970℃, and the T_α+β→β of N36 zircaloy was 890℃.