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The reason was searched why the lock pins of tin bronze would break by means of macroscopic examination, chemical analysis, metallographic test, electron microscopic observation and EDS.

采用宏观检查、化学分析、金相检验、电镜观察、断口能谱法分析了锡青铜闭口销的断裂原因,结果表明,闭口销的断裂是由于材料成分差错,导致其在应力腐蚀作用下早期断裂。