The Ductile to Brittle Transition Behavior of the Modified 9Cr-1Mo Steel and Its Laser Welds
作者单位：Department of Materials Science and EngineeringTaiwan University Taipei 106 China Taiwan Department of Materials Science and Engineering Dong Hwa University Hualien 974 China Taiwan Department of Materials Science and Engineering Taiwan University Taipei 106 China Taiwan
会议名称：《海峡两岸第二届工程材料研讨会》
会议日期：2004年
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
关 键 词：modified 9Cr-1Mo steel laser welding impact toughness ductile to brittle transition temperature
摘 要：The ductile to brittle transition temperature (DBTT) of the modified 9Cr-1Mo steel and its laser welds was studied. The increase in grain size of the weld structure ascended the DBTT of the steel significantly. The transformation of retained austenite at martensite interlath boundaries into untempered and/or twinned martensite could also contribute to increased DBTTs of the steel and its welds tempered at 540℃.