Fatigue Strength of Ferritic Ductile Cast Iron Hardened by Super Rapid Induction Heating and Quenching
Fatigue Strength of Ferritic Ductile Cast Iron Hardened by Super Rapid Induction Heating and Quenching
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超快速感应加热淬火铁素体球墨铸铁的疲劳强度
DOI：
10.2320/matertrans.45.2930
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Shimizu
中科院分区：
文献类型：
--
作者：
Y. Misaka;Kazuhiro Kawasaki;J. Komotori;M. Shimizu
为了阐明超快速感应加热淬火 (SRIHQ) 对铁素体球墨铸铁 (FDI) 疲劳性能的影响，对经过四种加热循环处理的试样进行了旋转弯曲疲劳试验。结果表明； (i) SRIHQ 过程在石墨周围产生了一个薄薄的深灰色区域。该暗部由马氏体组织（环状马氏体）构成。 (ii)环形马氏体在表面硬化层处产生残余压应力场。观察到两种类型的压缩残余应力产生机制。一种是由于环状马氏体的形成而产生的微观残余应力的过程，另一种是由于表面硬化层的扩展而产生的宏观残余应力的过程。 (iii) SRIHQ 处理过的 FDI 样品的疲劳强度高于未处理过的样品。这是因为环状马氏体产生的残余压应力场抑制了疲劳裂纹的萌生和扩展。
To clarify the effects of Super Rapid Induction Heating and Quenching (SRIHQ) on fatigue properties of Ferrite Ductile Cast Iron (FDI), rotational bending fatigue tests were carried out on specimens treated with four types of heating cycle. Results showed that; (i) the SRIHQ process generated a thin dark gray area around the graphite. This dark area was composed of a martensite structure (ringed martensite). (ii) The ringed martensite generated a compressive residual stress field at the surface hardened layer. Two types of compressive residual stress generative mechanisms were observed. One was a microscopic residual stress generative process due to the formation of ringed martensite and the other was a macroscopic residual stress generative process due to the expansion of the surface hardened layer. (iii) The fatigue strength of SRIHQ treated FDI specimen was higher than that of the untreated one. This was because the compressive residual stress field generated by the ringed martensite suppressed initiation and propagation of fatigue cracks.