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High-strength low-alloy steel

About: High-strength low-alloy steel is a(n) research topic. Over the lifetime, 625 publication(s) have been published within this topic receiving 7232 citation(s). The topic is also known as: High Tensile Strength Steel; HTSS.
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Journal ArticleDOI
Abstract: The aim of this paper is to evaluate the machinability of hardened steels at different levels of hardness and using a range of cutting tool materials. More specifically, the work was focused on the machinability of hardened AISI 4340 high strength low alloy steel and AISI D2 cold work tool steel. The tests involving the AISI 4340 steel were performed using two hardness values: 42 and 48 HRC; in the former, a coated carbide insert was used as cutting tool, whereas in the latter a polycrystalline cubic boron nitride insert was employed. The machining tests on the AISI D2 steel hardened to 58 HRC were conducted using a mixed alumina-cutting tool. Machining forces, surface roughness, tool life and wear mechanisms were assessed. The results indicated that when turning AISI 4340 steel using low feed rates and depths of cut, the forces were higher when machining the softer steel and that surface roughness of the machined part was improved as cutting speed was elevated and deteriorated with feed rate. Abrasion was the principal wear mechanism acting when turning the 42 HRC steel, whereas diffusion was present when machining the 50 HRC steel. Turning AISI D2 steel (58 HRC) with mixed alumina inserts allowed a surface finish as good as that produced by cylindrical grinding. The flank wear of the mixed alumina tool increased with cutting speed and depth of cut, presenting a considerably higher tool wear rate when using at a cutting speed of 220 m/min and feed rate of 0.15 mm/rev, which resulted in tool failure by spalling.

210 citations


Journal ArticleDOI
18 Jan 2002-Scripta Materialia
Abstract: Fatigue tests were carried out at frequencies of 100 Hz, 600 Hz, and 20 kHz for low-temperature-tempered JIS SNCM439 steel. Almost all specimens were broken from internal inclusions and frequency effects were not found on the gigacycle fatigue properties. The fatigue limit appeared at over 109 cycles.

153 citations


01 Jan 1991-
Abstract: This study is concerned with a correlation between the microstructure and the local brittle zone (LBZ) phenomena in high-strength low-alloy (HSLA) steel welds. The influence of the LBZ on toughness was investigated by means of simulated heat-affected zone (HAZ) tests as well as welded joint tests. Micromechanical processes involved in microvoid and cleavage microcrack formation were also identified using notched round tensile tests and subsequent scanning electron microscopy (SEM) analyses. The LBZ in the HAZ of a mUltipass welded joint is the intercritically reheated coarse-grained HAZ whose properties are strongly influenced by metallurgical factors such as an effective grain size and high-carbon martensitic islands: The experimental results indicated that Charpy energy was found to decrease monotonically with increasing the amount of martensitic islands, confirming that the martensitic island is the major microstructural factor controlling the HAZ toughness. In addition, microvoids and microcracks were found to initiate at the interface between the martensitic island and the ferrite matrix, thereby causing the reduction in toughness. These findings suggest that the LBZ phenomena in the coarse-grained HAZ can be explained by the morphology and the amount of martensitic islands.

138 citations


Journal ArticleDOI
Abstract: This study is concerned with a correlation between the microstructure and the local brittle zone (LBZ) phenomena in high-strength low-alloy (HSLA) steel welds The influence of the LBZ on toughness was investigated by means of simulated heat-affected zone (HAZ) tests as well as welded joint tests Micromechanical processes involved in microvoid and cleavage microcrack formation were also identified using notched round tensile tests and subsequent scanning electron microscopy (SEM) analyses The LBZ in the HAZ of a mUltipass welded joint is the intercritically reheated coarse-grained HAZ whose properties are strongly influenced by metallurgical factors such as an effective grain size and high-carbon martensitic islands: The experimental results indicated that Charpy energy was found to decrease monotonically with increasing the amount of martensitic islands, confirming that the martensitic island is the major microstructural factor controlling the HAZ toughness In addition, microvoids and microcracks were found to initiate at the interface between the martensitic island and the ferrite matrix, thereby causing the reduction in toughness These findings suggest that the LBZ phenomena in the coarse-grained HAZ can be explained by the morphology and the amount of martensitic islands

130 citations


Journal ArticleDOI
Abstract: Evaluating the impact performance of resistance spot welded joints in advanced high strength steels (AHSS) is critical for their continued integration into the automotive architecture. The effect of strain rate on the joint strength and failure mode is an important consideration in the design of welded structures. Recent results suggest that the failure mode is dependent upon the strength, chemistry, and processing of AHSS. Current literature, however, does not explain the effects of weld microstructure and a comprehensive comparison has yet to be conducted. The present study details the fracture paths within the joint microstructure of spot welded AHSS, including dual phase (DP), transformation induced plasticity (TRIP) and ferritic–bainitic (FB), in comparison to new high strength low alloy steels. Quasi-static and impact tests were conducted using a universal tensile tester and an instrumented drop tower respectively. Results for elongation, failure load and energy absorption for each material ...

128 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
202144
202052
201935
201830
201726

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Topic's top 5 most impactful authors

Ryoji Ishigaki

8 papers, 76 citations

Yunhua Huang

7 papers, 85 citations

Yoru Wada

7 papers, 67 citations

G. Madhusudhan Reddy

6 papers, 172 citations

Elliot Biro

5 papers, 192 citations