In this study, quenching and tempering were employed to achieve the optimal match of strength toughness high-strength low-alloy (HSLA) 15CrNi3MoV steel. The effect temperature on microstructure evolution carbides precipitation steel was also investigated using scanning electron microscopy (SEM), a X-ray diffractometer (XRD) transmission (TEM). results showed that after at different temperatures...

Performance-based fire design for cold-formed steel systems is in its infancy. This paper brings together existing research on cold-formed steel materials, members, and assemblages at elevated temperatures; and complementary analysis and design methods necessary for the development of analysis-based design for cold-formed steel systems under fire. Cold-formed steel systems have become popular i...

Steel ball surface-defect inspection was performed by using a new saddle-type eddy current sensor (SECS), which included a saddle coil and a signal conditioning circuit. The saddle coil was directly wound on the steel ball's outer bracket in a semi-circumferential direction. Driven by a friction wheel, the test steel ball rotated in a one-dimensional direction, such that the steel ball surface ...

The fracture behavior of a high-strength low-alloy steel subjected to tempforming at 873 K, 923 or 973 K was studied by means impact and bending tests. A decrease in temperature promoted the grain refinement resulting ultrafine grained lamellar-type microstructure with finely dispersed particles that led significant strengthening along an increase toughness. tempformed samples exhibited Charpy ...

Abstract Defects would occur in the weld joint of wheel rims during post-flash butt welding (FBW) process suffering from poor plasticity, which will deteriorate quality and lifecycle finish products. Therefore, FBW 440CL high-strength-low-alloy (HSLA) steel was physically simulated influence flash parameters on joints systematically evaluated this study. The results showed that width heat affec...