40Cr农机传动轴断裂失效分析
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- 英文论文题名：Fracture failure analysis of 40Cr agricultural machinery drive shaft
- 论文作者：周荣青 ; 孙维连 ; 孙铂 ; 张艺 ; 张淼
- 英文论文作者：Zhou Rongqing ; Sun Weilian ; Sun Bo ; Zhang Yi ; Zhang Miao ; College of Mechanical and Electric Engineering ; Agricultural University of Hebei
- 年：2016
- 作者机构：河北农业大学机电工程学院;
- 论文关键词：传动轴 ; 失效分析 ; 网状铁素体 ; 脆性断裂 ; 热处理
- 英文论文关键词：Drive shaft ; Failure analysis ; Network ferrite ; Brittle fracture ; Heat treatment
- 会议召开时间：2016-07-19
- 会议录名称：第十五届全国金相与显微分析学术年会论文集
- 语种：中文
- 分类号：TG115
- 学会代码：EGTA
- 会议名称：第十五届全国金相与显微分析学术年会
- 会议地点：中国青海西宁
- 主办单位：中国体视学学会金相与显微分析分会
- 学会名称：中国体视学学会
- 页数：4
- 文件大小：1305k
- 原文格式：O
- 会议级别：全国
摘要
40Cr传动轴在使用过程中出现断裂现象。为了找出断裂原因,利用体视显微镜、直读光谱仪和光学显微镜等设备对断轴的断口形貌、化学成分和显微组织进行了观察与检验分析。结果表明:由于淬火冷却缓慢,网状铁素体沿奥氏体晶界析出,使调质后存在较大组织应力,降低材料的强度,是断裂的主要原因;较严重的非金属夹杂物也增加了断裂倾向。建议通过控制淬火液介质中杂质的含量、介质的温度和淬火的冷却时间,使调质后形成均匀细针状索氏体,提高材料的综合力学性能,避免使用过程中发生断裂现象。
Parts of drive shafts made of 40 Cr steel present fracture phenomenon in early using life.To find out the reasons of fracturing in the early using life and avoid the appearance of early failure of the drive shafts again,the macroscopic fracture figures,the chemical compositions,and the microstructures of the drive shafts were analyzed by using the stereo microscope,the direct reading spectrometer and optical microscope.The results showed that the chemical compositions met the requirements of the shaft.And the main reasons causing the fracture of shafts in the early using life were that,the network ferrite precipitated along the grain boundary of austenite because of the slow cooling in the quenching process,which caused the large organization stress existing after quenching and tempering,and the decrease of strength and toughness.What's more,the many Non-metallic inclusions made the shaft fracture easily.To avoid the appearance of the fracture in the using life,controlling the impurity and temperature of the quenching liquid and cooling time of the quenching is suggested,to form the acicular tempered sorbite after the quenching and tempering and possess fine comprehensive mechanical properties.
Parts of drive shafts made of 40 Cr steel present fracture phenomenon in early using life.To find out the reasons of fracturing in the early using life and avoid the appearance of early failure of the drive shafts again,the macroscopic fracture figures,the chemical compositions,and the microstructures of the drive shafts were analyzed by using the stereo microscope,the direct reading spectrometer and optical microscope.The results showed that the chemical compositions met the requirements of the shaft.And the main reasons causing the fracture of shafts in the early using life were that,the network ferrite precipitated along the grain boundary of austenite because of the slow cooling in the quenching process,which caused the large organization stress existing after quenching and tempering,and the decrease of strength and toughness.What's more,the many Non-metallic inclusions made the shaft fracture easily.To avoid the appearance of the fracture in the using life,controlling the impurity and temperature of the quenching liquid and cooling time of the quenching is suggested,to form the acicular tempered sorbite after the quenching and tempering and possess fine comprehensive mechanical properties.
引文
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[2]乜龙威,孙维连,苏珂,等.农用水泵轴断裂故障分析与工艺改进[J].农业工程学报,2015,31(4):103-106.
[3]张黎,刘宝昌,胡本洋,等.40Cr曲轴断裂分析与工艺改进[J].热加工工艺,2013,42(2):216-218
[4]金林奎,赵建国,王春亮,等.40Cr钢汽车半轴断裂失效分析[J].金属热处理,2015,40(2):220-223.
[5]李伟,陈文琳,吴跃,等.40Cr商用车前轴早期断裂失效分析[J].塑性工程学报,201 4,21(5):88-92.
[6]孙维连,陈再良,王成彪,等.机械产品失效分析思路及失效案例分析[J].材料热处理学报,2004,25(1):69-73.
[7]孙维连,杨钰瑛.35CrMo钢拉杆显微组织与性能[J].金属热处理,2005,30(1 1):79-82.
[8]冯磊,轩福贞.非金属夹杂物对材料内局部应力集中的影响[J].机械工程学报,2013,49(8):41-48.
[9]贺会敏,孙维连,王会强.60Si2Mn农用车减振弹簧断裂失效分析[J].东北大学学报:自然科学版,2010,6(31):130-132
[10]林良有,张玉秀,朱张校,等.汽车下摆臂断裂失效分析[J].金属热处理,2004,29(12):77-79.