Spot-tests for the detection of alloying elements in steel

Evans, B. S.; Higgs, D. G.

doi:10.1039/an9457000075

Cited by 8 publications

(5 citation statements)

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“…17 Secondary hardening is time and temperature dependent. As it was indicated by Bain, 13 and later by Irvine and Pickering, 17 secondary hardening is caused by alloy carbides that are formed during tempering. This investigation shows that tempering of the FL-5305 powder material at 550uC/1 h and 650uC/0?5 h does not result in secondary hardening.…”

Section: Secondary Hardeningmentioning

confidence: 85%

“…1 Through a series of toughness tests, Bain saw that toughness decreases at tempering temperatures .200uC and up to 315uC. 13 As a matter of fact, when the steel was tempered in the range of 260-315uC, the notch toughness was even lower than when it is tempered at 150uC. 13 Later, Grossmann and Bain showed that for steels with 0?4 and 0?5 wt-% carbon, an increase in toughness is achieved either by tempering in the range of 150-200uC or above 425uC; and within the range of 260-370uC, TME took place and the toughness dropped.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…13 As a matter of fact, when the steel was tempered in the range of 260-315uC, the notch toughness was even lower than when it is tempered at 150uC. 13 Later, Grossmann and Bain showed that for steels with 0?4 and 0?5 wt-% carbon, an increase in toughness is achieved either by tempering in the range of 150-200uC or above 425uC; and within the range of 260-370uC, TME took place and the toughness dropped. 14 Generally, TME becomes worse as the phosphorus content increases; 15,16 however, the main cause of TME seems to be cementite formation during the second (200-300uC) and third stages (200-350uC) of tempering.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The influence of the addition of Cr and Mo in retarding, halting and even reversing the softening behaviour during tempering was shown by Bain. 13 The hardness increase during tempering is referred to as secondary hardening. The hardness reaches levels higher than the as quenched martensite.…”

Section: Secondary Hardeningmentioning

confidence: 99%

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Tempering of 3Cr–0·5Mo sintered steel: influence on mechanical properties

et al. 2012

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Prealloyed 3Cr-0?5Mo steel powder (FL-5305) is considered as an outstanding sinter hardenable grade. Although the FL-5305 powder, at conventional sintering conditions, renders excellent tensile strength, yield stress and hardness, it suffers from low toughness. In this study, with the aim of increasing toughness without a considerable loss of hardness, different tempering treatments have been evaluated. To this end, tempering treatments have been performed at 200, 400, 550 and 650uC for different times. The influence of tempering on hardness, tensile properties as well as impact energy has been investigated. As compared to the hardness (20 HRC) and impact energy (14 J) of a conventionally sintered material, sinter hardening plus tempering at 650uC for 30 min resulted in a significant increase of impact energy (17 J), while the hardness remained the same. Tempering at 400uC for 2 h led to temper embrittlement and hence the lowest impact properties.

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Section: Secondary Hardeningmentioning

confidence: 85%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Secondary Hardeningmentioning

confidence: 99%

See 2 more Smart Citations

Tempering of 3Cr–0·5Mo sintered steel: influence on mechanical properties

et al. 2012

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show abstract

“…Hall and Smith (7) and Lenher and Crawford (9) worked with dilute sulfuric acid medium while Levy (10) used concentrated acid. Later investigations (3,4,8, IS,19) have followed these two lines of approach, and individual investigators in general list no specific reason for utilizing the particular solvent…”

mentioning

confidence: 99%