Experimental verification of tailor welded joining partners for hot stamping and analytical modeling of TWBs rheological constitutive in austenitic state

摘要: Abstract Hot stamping of quenchable ultra high strength steels currently represents a standard forming technology in the automotive industry for manufacture safety and crash relevant components. Recently, hot Tailor-Welded Blanks (TWBs) is proposed to meet environmental requirements by supplying car structural body components with functionally optimized tailored mechanical properties. In this paper, an appropriate partner material quenchenable boron steel B1500HS based on phase transformation deformation behavior under process conditions determined. It generally accepted that properties joint after quenching should following requirements. The value yield (YS) be between 350 500 MPa. ultimate tensile (UTS) within limits 500–650 MPa, total elongation (TEL) until rupture higher than 13%. Two kinds High Strength Low Alloy (HSLA) cold rolled B340LA B410LA are chosen verification which one as partner. Microhardness measured metallographic investigated different base materials corresponding weld seams. pointed out ideal thermal An Arrhenius constitutive law implemented improve characterization description partner, well seam austenitic state. comparisons simplified Hensel–Spittel model show describes experimental data fairly well.