Elastic Sag Property of Low Carbon Martensite Spring Steel
来源期刊：材料保护2004年增刊第2期
论文作者：DUO Tie-yun Zhu Yin-lu Wu Zi-ping LI Ye-sheng CHEN Mi-song
关键词：spring steel; elastic sag resistance; test method; evaluation index; cyclic softening;
摘 要：This paper studies the elastic sag resistance of new low-carbon martensite spring steel 35Si2CrVB developed recently and points out that the cause of elastic sag is attributed to cyclic softening of spring steel engendered during its serving,also considers that elastic sag property should be evaluated by dynamic mechanical properties of spring material such as dynamic yield strength σ'0.2, ratio of dynamic yield strength σ'0.2 vs. tensile strength σb (σ'0.2/σb) and ratio of dynamic yield strength σ' 0.2vs. static yield strengthσ0.2 (σ'0.2/σ0. 2 )etc. , which are measured by the cyclic stress-strain curve test. Compared with conventional spring steel 60Si2MnA, 35Si2CrVB has good advantages in both dynamic and static properties, which show it possesses higher elastic sag resistance than 60Si2MnA because of its lath-martensite structure tempering in low temperature different from 60Si2MnA steel's plate martensite structure tempering inmedium temperature. So it can be demonstrated that low carbon martensite spring steel is more appropriate for the demands of spring.
DUO Tie-yun1，Zhu Yin-lu2，Wu Zi-ping2，LI Ye-sheng2，CHEN Mi-song2
(1.Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, P. R. China;
2.Jiangxi University of Science and Technology, Ganzhou 341000)
摘要:This paper studies the elastic sag resistance of new low-carbon martensite spring steel 35Si2CrVB developed recently and points out that the cause of elastic sag is attributed to cyclic softening of spring steel engendered during its serving,also considers that elastic sag property should be evaluated by dynamic mechanical properties of spring material such as dynamic yield strength σ''0.2, ratio of dynamic yield strength σ''0.2 vs. tensile strength σb (σ''0.2/σb) and ratio of dynamic yield strength σ'' 0.2vs. static yield strengthσ0.2 (σ''0.2/σ0. 2 )etc. , which are measured by the cyclic stress-strain curve test. Compared with conventional spring steel 60Si2MnA, 35Si2CrVB has good advantages in both dynamic and static properties, which show it possesses higher elastic sag resistance than 60Si2MnA because of its lath-martensite structure tempering in low temperature different from 60Si2MnA steel''s plate martensite structure tempering inmedium temperature. So it can be demonstrated that low carbon martensite spring steel is more appropriate for the demands of spring.
关键词:spring steel; elastic sag resistance; test method; evaluation index; cyclic softening;
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