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Effect of Thermal Drilling Condition on Burring in Ultrahigh Strengh TRIP Sheet Steels

Journal of Iron and Steel Research International 2011年第S1期18卷 442-446页

作者： akihiko nagasaka Takuya Matsushima Shun Hasebe Koh-ichi Sugimoto Toshio Murakami Nagano National College of Technology 716 TokumaNaganoNagano 381-8550Japan Shinshu University 4-17-1 WakasatoNaganoNagano 380-8553Japan Material Design Research Section Material Research LaboratoryKobe SteelLtd.1-5-5 TakatsukadaiNishi-kuKobeHyogo 651-2271Japan

Effect of thermal drilling condition on burring of 0.2C-(1.0-2.5)Si-(1.0-2.0)Mn (mass%) ultrahigh strength TRIP-aided sheet steels with polygonal ferrite matrix (TDP steels) was investigated for automotive *** combined rotational and downward force of the thermal drilling tool bit created friction *** height of the bushing was roughly 3 to 4 times the initial sheet *** bushings are ideal for thread applications,as the strength of threads was significantly *** found that the burring and tapping contributed to the improvement of the tensile strength of 980 MPa class TRIP steel.

关键词： TRIP sheet steel burring tapping thermal drilling

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EFFECTS OF YAG LASER CUTTING AND POST HEAT TREATMENT ON STRETCH-FLANGEABILITY OF 0.1%-0.4%C TRIP STEELS

EFFECTS OF YAG LASER CUTTING AND POST HEAT TREATMENT ON STRE...

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作者： akihiko nagasaka Koh-ichi Sugimoto Yoichi Mukai Yuichi Kubota Nagano National College of Technology 716 TokumaNagano 381-8550 Japan Shinshu University 4-17-1 Wakasato Nagano 380-8555 Japan Kakogawa Works Kobe SteelLtd. 2222-1 IkedaOnoe-choKakogawa675 -0023 Japan Nagano National College of Technology 716 TokumaNagano 381-8550 Japan

＜正＞The transformation-induced plasticity （TRIP） of retained austenite is very useful to enhance the press formability of ultra high strength sheet steels. The TRIP steels with different matrix structure and different retained austenite morphology have been developed for weight reduction and shock safety up to now. The conventional TRIP-aided dual-phase steel or "TRIP-aided polygonal ferrite （PF） steel" composing of polygonal ferrite matrix and blocky retained austenite plus bainite second phase possessd an excellent stretch-formability and deep drawability. We have recently developed new type of TRIP steel or "TRIP-aided annealed martensitic （AM） steel" composing of bainitic ferrite matrix by annealed martensite matrix, and "TRIP-aided bainitic ferrite （BF） steel"composing of bainitic ferrite matrix and interlath retained austenite films. It is supposed that carbon addilion is effective to rise the tensile strength of TRIP steel. So, in the present study the effects of YAG laser cutting and post heat treatment on the stretch-flangeability of 0. 1% -0.4%C TRIP steels was investigated. The sirength-stretch-flangeability balance （TS×λ） of holes obtained by either laser cutting and hole-punching decreased with increasing carbon content in PF, AM and BF steels. When the carbon content of 0. 3 mass% or higher, the λ value in the case of laser cutting decreased to a level comparable to that in the case of hole-punching in PF steels. We demonstrated that the post heat treatment contributes to the improvement of the stretch-flangeability of PF steels. On the other hand, we demonstrated that YAG laser cutting contributes to the improvement of the stretch-flangeability of 1 200 MPa class BF steels with 0. 4 mass%.

关键词： YAG Laser Cutting Post heat treatment TRIP Steel Transformation-induced Plasticity Stretch-flangeability

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Effect of Thermal Drilling Condition on Burring in Ultrahigh Strengh TRIP Sheet Steels

Effect of Thermal Drilling Condition on Burring in Ultrahigh...

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第六届国际低合金高强度钢会议

作者： akihiko nagasaka Takuya Matsushima Shun Hasebe Koh-ichi Sugimoto Toshio Murakami Nagano National College of Technology 716TokumaNaganoNagano 381-8550Japan Shinshu University 4-17-1 WakasatoNaganoNagano 380-8553Japan Material Design Research Section Material Research LaboratoryKobe SteelLtd.1-5-5 TakatsukadaiNishi-kuKobeHyogo 651-2271Japan

＜正＞Effect of thermal drilling condition on burring of 0.2C-（1.0-2.5）Si-（1.0-2.0）Mn（mass%） ultrahigh strength TRIP-aided sheet steels with polygonal ferrite matrix（TDP steels） was investigated for automotive *** combined rotational and downward force of the thermal drilling tool bit created friction *** height of the bushing was roughly 3 to 4 times the initial sheet *** bushings are ideal for thread applications,as the strength of threads was significantly *** found that the burring and tapping contributed to the improvement of the tensile strength of 980 MPa class TRIP steel.

关键词： TRIP sheet steel burring tapping thermal drilling

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