影响Q235B拉拔断裂的因素分析
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摘要
针对天津市某冶金企业(A厂)产Q235B圆钢产品在拉拔过程中出现明显加工硬化,布氏硬度比同类型企业(B厂)个别产品高出40~50 HB,甚至出现裂纹,这种情况在冬春季节尤其容易发生.本研究采用拉伸试验、断口形貌、组织观察、硬度测试、成分分析和位错增量等手段方法分析材料产生此现象的原因.结果表明:A厂产品含碳量略高于B厂是产生加工硬化的主要原因,冬春季节温度偏低加剧了裂纹的萌生.
Q235 B round steel products of a metallurgical enterprise(A factory)in Tianjin show significant hardening in the process of drawing,A products of Brinell hardness are higher more 40~50 HB than the same type of enterprise(B plant)individual products or even cracked. The phenomenon is particularly prone in winter and spring. In this study,the causes of the test were studied by means of tensile test,fracture morphology,tissue observation,hardness test,component analysis and dislocation increment test. The results show that the carbon content of product A is slightly higher than that of the B plant,which is the main cause of work hardening. The low temperature in winter and spring aggravates the initiation of cracks.
Q235 B round steel products of a metallurgical enterprise(A factory)in Tianjin show significant hardening in the process of drawing,A products of Brinell hardness are higher more 40~50 HB than the same type of enterprise(B plant)individual products or even cracked. The phenomenon is particularly prone in winter and spring. In this study,the causes of the test were studied by means of tensile test,fracture morphology,tissue observation,hardness test,component analysis and dislocation increment test. The results show that the carbon content of product A is slightly higher than that of the B plant,which is the main cause of work hardening. The low temperature in winter and spring aggravates the initiation of cracks.
引文
[1]刘桂华.460高强度英标螺纹钢减量化轧制技术的研究与开发[D].天津:河北工业大学,2011.
[2]权淑丽,吴俏君,郭昭桥.采用X射线衍射仪研究不同变形量下钢材的位错密度[J].浙江冶金,2015,2(1):21-24.
[3]潘龙,何闻,顾邦平.电流脉冲对45碳钢试样位错密度和残余应力的影响[J].材料热处理学报,2015,36(S1):134-138.
[4]范文静,孙维连,王会强.Q235B钢管的断裂失效分析[J].金属热处理,2010,35(7):163-165.
[5]石德珂,熊漪.材料的加工硬化对断裂的影响[J].兵器材料科学与工程,1990,8(8):1-5.
[6]荆洪阳,瞿立兴,张玉凤,等.加工硬化特性对高强钢断裂韧性的影响[J].压力容器,1995(3):3-8.
[7]程万军,黄良驹,刘化民.20Cr Mn Ti钢位错密度的测定及其位错形态研究[J].材料科学与工艺,2004,2(5):486-488.
[8]刘金艳.X射线残余应力的测量技术与应用研究[D].北京:北京工业大学,2009.
[9]王继周,李晋霞,邰振中.管材拉拔中的不均匀变形与残余应力[J].塑性工程学报,2001,8(4):40-43.
[10]郝成文,孙祥煜,孙倩,等.Q235钢板旋压成形断裂原因分析[J].大连交通大学学报,2008,29(4):64-67.
[11]范文静,孙维连,王会强.Q235B钢管的断裂失效分析[J].金属热处理,2010,35(7):163-165.
[12]黎渊博,高丽娜,王海博.Q235钢板的脆性断裂失效分析[J].热加工工艺,2013,42(23):209-211.
[13]卢险峰,周勇,盛自强.考虑冷变形加工硬化的翻边力理论计算[J].南昌大学学报,2009,31(2):163-167.
[2]权淑丽,吴俏君,郭昭桥.采用X射线衍射仪研究不同变形量下钢材的位错密度[J].浙江冶金,2015,2(1):21-24.
[3]潘龙,何闻,顾邦平.电流脉冲对45碳钢试样位错密度和残余应力的影响[J].材料热处理学报,2015,36(S1):134-138.
[4]范文静,孙维连,王会强.Q235B钢管的断裂失效分析[J].金属热处理,2010,35(7):163-165.
[5]石德珂,熊漪.材料的加工硬化对断裂的影响[J].兵器材料科学与工程,1990,8(8):1-5.
[6]荆洪阳,瞿立兴,张玉凤,等.加工硬化特性对高强钢断裂韧性的影响[J].压力容器,1995(3):3-8.
[7]程万军,黄良驹,刘化民.20Cr Mn Ti钢位错密度的测定及其位错形态研究[J].材料科学与工艺,2004,2(5):486-488.
[8]刘金艳.X射线残余应力的测量技术与应用研究[D].北京:北京工业大学,2009.
[9]王继周,李晋霞,邰振中.管材拉拔中的不均匀变形与残余应力[J].塑性工程学报,2001,8(4):40-43.
[10]郝成文,孙祥煜,孙倩,等.Q235钢板旋压成形断裂原因分析[J].大连交通大学学报,2008,29(4):64-67.
[11]范文静,孙维连,王会强.Q235B钢管的断裂失效分析[J].金属热处理,2010,35(7):163-165.
[12]黎渊博,高丽娜,王海博.Q235钢板的脆性断裂失效分析[J].热加工工艺,2013,42(23):209-211.
[13]卢险峰,周勇,盛自强.考虑冷变形加工硬化的翻边力理论计算[J].南昌大学学报,2009,31(2):163-167.