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对四种不同厚度的楔形试块，经铁素体退火后，作力学性能的研究，结果为，平均球径增大主要导致δ的降低，对σb、σ0．2的影响不大。
For the four kinds of wedge test pieces with different thicknesses, after ferrite annealing, the mechanical properties were studied. As a result, the increase of the average ball diameter led to the decrease of δ, but had little effect on σb and σ0.2.