基于小冲杆试验的纯钨韧脆转变温度测定及其变形特性  

Ductile-Brittle Transition Temperature Measuring and Deformation Characteristics of Pure Tungsten Based on Small Punch Testing

作　　者：黄俊[1,2,3] 袁国虎 左彤 魏松 吴玉程 HUANG Jun;YUAN Guohu;ZUO Tong;WEI Song;WU Yucheng(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology,Hefei 230009,China;Key Laboratory of Advanced Functional Materials and Devices of Anhui Province,Anhui Provincial International S&T Cooperation Base for Advanced Energy Materials,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]有色金属与加工技术国家地方联合工程研究中心,合肥230009 [3]安徽省先进功能材料与器件重点实验室,安徽省先进能源材料国际合作基地,合肥230009

出　　处：《机械工程材料》2024年第7期11-16,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金国际(地区)合作研究与交流项目(52020105014)。

摘　　要：在不同温度(25,200,300,400,500℃)下对纯钨进行小冲杆试验,获得断裂能与温度之间的关系,拟合得到纯钨的韧脆转变温度;对不同温度小冲杆试验后的纯钨断口形貌进行观察,探究纯钨在小冲杆试验中的变形特性。结果表明:在25,200℃下纯钨处于完全脆性状态,在300℃下处于半脆性状态,而当温度达到400℃后,纯钨表现出良好的塑性;在250~400℃范围内纯钨的断裂能急剧升高,拟合得到的韧脆转变温度为(342±8)℃。当温度低于韧脆转变温度,纯钨断口存在沿轧制方向的长直裂纹,断裂特征随温度升高由沿晶断裂向穿晶断裂转变;当温度高于韧脆转变温度,断口出现帽形挤出形貌以及环形裂纹和短缺口裂纹,并且环形裂纹处存在大量韧窝,断裂特征为韧性断裂,且短缺口裂纹处出现钨分层现象。Small punch testing was conducted on pure tungsten at different temperatures(25,200,300,400,500℃).The relationship between fracture energy and temperature was obtained,and then the ductile-brittle transition temperature of pure tungsten was fitted.The fracture morphology of pure tungsten after small punch testing at different temperatures was observed,and the deformation characteristics of pure tungsten during small punch testing were investigated.The results show that pure tungsten was in a completely brittle state at 25,200℃,and was in a semi-brittle state at 300℃.When the temperature reached 400℃,pure tungsten showed good plasticity.The fracture energy of pure tungsten increased sharply in the range of 250‒400℃,and the ductile-brittle transition temperature by fitting was(342±8)℃.When the temperature was lower than the ductile-brittle transition temperature,the pure tungsten fracture had long straight cracks along the rolling direction,and the fracture characteristics changed from intergranular fracture to transgranular fracture with temperature.When the temperature was higher than the ductile-brittle transition temperature,cap extrusion morphology,annular cracks and shortmouth cracks appeared on fracture.There were a lot of dimple in the annular cracks,and the fracture characteristics were ductile fracture.A tungsten stratification phenomenon occurred in the shortmouth cracks.

关 键 词：面向等离子体材料 韧脆转变温度 小冲杆试验 变形特性 

分 类 号：TG146.4[一般工业技术—材料科学与工程]