热处理前后09MnNiDR钢焊接临界粗晶区的力学性能分析及影响机制
열처리전후09MnNiDR강한접림계조정구적역학성능분석급영향궤제
Mechanical performance analysis and influence mechanism research of the welding critical coarse-grained zone of 09MnNiDR steel before and after heat treatment
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