Influence of high-power diode laser heat treatment on wear resistance of a mold steel

Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous/dispersed quenching

“…By adjusting the scanning interval of the hardening unit and increasing their proportion, more dispersed support points can be formed, thereby mitigating surface substrate wear. According to relevant literature reports, specimens treated with full coverage scanning show a continuous martensitic hardened layer, which is prone to localized spalling during wear (Figure 12-c) [2,15,18]. Thus, by way of modulation, specimen treated by LDQ can achieve the same wear resistance as by LCQ, while also providing a certain degree of toughness.…”

“…The laser-quenched specimens underwent wear testing (Figure 4). Wear tests were conducted using a linear reciprocating friction machine (UMT-2MT) under unlubricated condition, with an applied normal load of 100 N [2]. The wear test samples were fitted with a G15 cylindrical pin (diameter 10mm, hardness 780 HV), under the specimen using wire cutting was quenched specimens, machined into a length of 15 mm× 15 mm× 10mm, surface roughness (Ra) of approximately 0.6μm.…”

“…Cr8 steel (ASTM D3M) is a commonly used alloy tool steel, due to its high hardenability and excellent comprehensive mechanical properties, which widely was used in the manufacture of cold-work mold, such as draw dies, stamping dies, cold extrusion dies and powder compacting dies, etc [1][2][3][4]. Meanwhile, it is also placed on high expectation in the modern high-performance vehicle high-strength steel parts stamping production [2,5]. During actual use, the surface of the mold to withstand the impact and high stress can easily give rise to fatigue fracture and small chipping [6][7][8][9].…”

Optimization of several surface treatment processes for alleviating fretting damage of a locking pin

“…Moreover, laser quenching (LQ), as an economical and efficient surface heat treatment, is a rapid austenitizing process [23]. The martensite structure generated by LQ treatment significantly enhances the hardness and strength of a substrate surface, and a residual compressive stress layer is also beneficial for resisting fretting wear [24,25]. According to the research of Wang et al [26], the wear resistance of railway wheel-rail material improved after LQ treatment, and the wear volumes of the wheel and rail materials were reduced by 92.9% and 80%, respectively.…”

Effect of Heat‐Treatment and NiB–TiO2 Composite Coating on the Tribological Performance of AISI P20 Steel

“…These processes typically involve heating the surface of AISI P20 steel or depositing a thin film onto the mold surface. Laser processing methods, [2,[20][21][22][23][24][25] plasma/ gas nitriding, [22][23][24][25][26] electrical discharge machining, [27][28][29] laminar plasma jet, [14] boronizing, [30][31][32] carburization, [31,33] and physical vapor deposition (PVD) coating, [5,6,9,34] are the most common techniques used to minimize, as much as possible, the failure at mold surface made of prehardened AISI P20 steel.…”