5CrNiMo芯棒接长杆断裂失效分析
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摘要
断裂芯棒接长杆所用材料为5CrNiMo热作模具钢。通过断口宏微观观察、化学成分、力学性能检测、金相检验和能谱分析等试验,确定芯棒接长杆的断裂性质及断裂原因。结果表明:芯棒接长杆的失效性质为脆性断裂,芯棒接长杆没有经过调质处理,致使该材料部分力学性能结果不符合要求,同时S、Cr、C元素含量高于技术要求,杂质元素易在晶界上偏聚造成沿晶弱化,从而加速断裂。
The material of the fracture mandrel connecting long rod is 5CrNiMo hot working die steel. The fracture properties and fracture reasons of the mandrel connecting long rod were determined by means of macro-microcosmic observation, chemical composition, mechanical property testing, metallographic examination and energy spectrum analysis.The results show that, the failure property of mandrel connecting long rod is brittle fracture, and the mandrel connecting long rod has not been quenched and tempered, some mechanical properties of the material do not meet the requirements. At the same time, the content of S, Cr and C elements is higher than the technical requirements, and impurity elements tend to segregate on grain boundaries and cause intergranular weakening and accelerate the fracture.
The material of the fracture mandrel connecting long rod is 5CrNiMo hot working die steel. The fracture properties and fracture reasons of the mandrel connecting long rod were determined by means of macro-microcosmic observation, chemical composition, mechanical property testing, metallographic examination and energy spectrum analysis.The results show that, the failure property of mandrel connecting long rod is brittle fracture, and the mandrel connecting long rod has not been quenched and tempered, some mechanical properties of the material do not meet the requirements. At the same time, the content of S, Cr and C elements is higher than the technical requirements, and impurity elements tend to segregate on grain boundaries and cause intergranular weakening and accelerate the fracture.
引文
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[2]杜尚增,王芬,张红杰.45钢接长杆热处理问题分析[J].煤矿机械,2012,33(12):114-115.
[3]唐中杰,郭铁明,寇生中,等.镍基高温合金K4169中夹杂物的特征及形成机理[J].中国有色金属学报,2015,25(9):2403-2413.
[4]赵贤平,曹树卫,万国喜,等.钢圆环链脆性断裂原因分析[J].失效分析与预防,2009,4(2):97-100.
[5]陈秋霞.金属材料脆性断裂原因的试验分析[J].内蒙古石油化工,2014,32(14):21-22.
[6]黎渊博,高丽娜,王海博,等.Q235钢板的脆性断裂失效分析[J].热加工工艺,2013,42(23):209-211.