A novel hole cold-expansion method and its effect on surface integrity of nickel-based superalloy
XianCao Ping, ZhangShuang Liu, Xue-Lin Lei*(), Run-Zi Wang, Xian-Cheng Zhang*(), Shan-Tung Tu

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Fig. 9.. Surface topographies of the (a) untreated specimen and the specimens with expansion degrees of (b) 0.4 %, (c) 0.7 %, and (d) 1%.